JavaScript Introduction
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- Andra Smith
- 7 years ago
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Transcription
1 JavaScript Introduction JavaScript is the world's most popular programming language. It is the language for HTML, for the web, for servers, PCs, laptops, tablets, phones, and more. JavaScript is a Scripting Language A scripting language is a lightweight programming language. JavaScript is programming code that can be inserted into HTML pages. JavaScript code can be executed by all modern web browsers. JavaScript is easy to learn. JavaScript: Writing Into HTML Output document.write("<h1>this is a heading</h1>"); document.write("<p>this is a paragraph</p>"); JavaScript: Reacting to Events <h1>my First JavaScript</h1> <p> JavaScript can react to events. Like the click of a button: </p> <button type="button" onclick="alert('welcome!')">click Me!</button> </body> </html>
2 JavaScript: Changing HTML Content Using JavaScript to manipulate the content of HTML elements is very common. <h1>my First JavaScript</h1> <p id="demo"> JavaScript can change the content of an HTML element. </p> functionmyfunction() x=document.getelementbyid("demo"); // Find the element x.innerhtml="hello JavaScript!"; // Change the content <button type="button" onclick="myfunction()">click Me!</button> </body> </html> JavaScripts in HTML must be inserted between and tags.javascripts can be put in the and in the <head> section of an HTML page. The Tag To insert a JavaScript into an HTML page, use the tag.the and tells where the JavaScript starts and ends.the lines between the and contain the JavaScript: alert("my First JavaScript");
3 Manipulating HTML Elements To access an HTML element from JavaScript, you can use the document.getelementbyid(id) method. Use the "id" attribute to identify the HTML element: Access the HTML element with the specified id, and change its content: <h1>my First Web Page</h1> <p id="demo">my First Paragraph</p> document.getelementbyid("demo").innerhtml="my First JavaScript"; </body> </html> Warning Use document.write() only to write directly into the document output. If you execute document.write after the document has finished loading, the entire HTML page will be overwritten: <h1>my First Web Page</h1> <p>my First Paragraph.</p> <button onclick="myfunction()">try it</button> function myfunction() document.write("oops! The document disappeared!");
4 </body> </html> JavaScript Statements JavaScript statements are "commands" to the browser. The purpose of the statements is to tell the browser what to do. This JavaScript statement tells the browser to write "Hello Dolly" inside an HTML element with id="demo": document.getelementbyid("demo").innerhtml="hello Dolly"; Semicolon ; Semicolon separates JavaScript statements. Normally you add a semicolon at the end of each executable statement. Using semicolons also makes it possible to write many statements on one line. JavaScript is Case Sensitive JavaScript is case sensitive. Watch your capitalization closely when you write JavaScript statements: A function getelementbyid is not the same as getelementbyid. A variable named myvariable is not the same as MyVariable. White Space JavaScript ignores extra spaces. You can add white space to your script to make it more readable. The following lines are equivalent: var person="hege"; var person = "Hege";
5 Break up a Code Line You can break up a code line within a text string with a backslash. The example below will be displayed properly: document.write("hello \ World!"); However, you cannot break up a code line like this: document.write\ ("Hello World!"); JavaScript Comments Comments will not be executed by JavaScript. Comments can be added to explain the JavaScript, or to make the code more readable. Single line comments start with //. The following example uses single line comments to explain the code: // Write to a heading: document.getelementbyid("myh1").innerhtml="welcome to my Homepage"; // Write to a paragraph: document.getelementbyid("myp").innerhtml="this is my first paragraph."; JavaScript Multi-Line Comments Multi line comments start with /* and end with */. The following example uses a multi line comment to explain the code: /* The code below will write to a heading and to a paragraph, and will represent the start of my homepage: */ JavaScript Variables As with algebra, JavaScript variables can be used to hold values (x=5) or expressions (z=x+y).
6 Variable can have short names (like x and y) or more descriptive names (age, sum, totalvolume). Variable names must begin with a letter Variable names can also begin with $ and _ (but we will not use it) Variable names are case sensitive (y and Y are different variables) JavaScript Data Types JavaScript variables can also hold other types of data, like text values (person="john Doe"). In JavaScript a text like "John Doe" is called a string. There are many types of JavaScript variables, but for now, just think of numbers and strings. When you assign a text value to a variable, put double or single quotes around the value. When you assign a numeric value to a variable, do not put quotes around the value. If you put quotes around a numeric value, it will be treated as text. var pi=3.14; var person="john Doe"; var answer='yes I am!'; Declaring (Creating) JavaScript Variables Creating a variable in JavaScript is most often referred to as "declaring" a variable. You declare JavaScript variables with the var keyword: varcarname; After the declaration, the variable is empty (it has no value). To assign a value to the variable, use the equal sign: carname="volvo"; However, you can also assign a value to the variable when you declare it: varcarname="volvo";
7 One Statement, Many Variables You can declare many variables in one statement. Just start the statement with var and separate the variables by comma: varlastname="doe", age=30, job="carpenter"; Your declaration can also span multiple lines: varlastname="doe", age=30, job="carpenter"; Value = undefined In computer programs, variables are often declared without a value. The value can be something that has to be calculated, or something that will be provided later, like user input. Variable declared without a value will have the valueundefined. The variable carname will have the value undefined after the execution of the following statement: varcarname; Re-Declaring JavaScript Variables If you re-declare a JavaScript variable, it will not lose its value:. The value of the variable carname will still have the value "Volvo" after the execution of the following two statements: varcarname="volvo"; varcarname; JavaScript Arithmetic As with algebra, you can do arithmetic with JavaScript variables, using operators like = and +:
8 y=5; x=y+2; JavaScript Data Types JavaScript Strings A string is a variable which stores a series of characters like "John Doe". A string can be any text inside quotes. You can use single or double quotes: var answer="it's alright"; var answer="he is called 'Johnny'"; var answer='he is called "Johnny"'; JavaScript Numbers JavaScript has only one type of numbers. Numbers can be written with, or without decimals: var x1=34.00; var x2=34; // Written with decimals // Written without decimals Extra large or extra small numbers can be written with scientific (exponential) notation: var y=123e5; // var z=123e-5; // JavaScript Booleans Booleans can only have two values: true or false. var x=true; var y=false; Booleans are often used in conditional testing. You will learn more about conditional testing in a later chapter of this tutorial.
9 JavaScript Arrays The following code creates an Array called cars: var cars=new Array(); cars[0]="saab"; cars[1]="volvo"; cars[2]="bmw"; or (condensed array): var cars=new Array("Saab","Volvo","BMW"); JavaScript Objects An object is delimited by curly braces. Inside the braces the object's properties are defined as name and value pairs (name : value). The properties are separated by commas: var person=firstname:"john", lastname:"doe", id:5566; The object (person) in the example above has 3 properties: firstname, lastname, and id. Spaces and line breaks are not important. Your declaration can span multiple lines: var person= firstname : "John", lastname : "Doe", id : 5566 ; You can address the object properties in two ways: var person= firstname : "John", lastname : "Doe", id : 5566
10 ; document.write(person.lastname + "<br>"); document.write(person["lastname"] + "<br>"); </body> </html> Declaring Variables as Objects When a variable is declared with the keyword "new", the variable is declared as an object: var name = new String; var x = new Number; var y = new Boolean; JavaScript Functions A function is a block of code that will be executed when "someone" calls it: <head> function myfunction() alert("hello World!"); </head> <button onclick="myfunction()">try it</button> </body> </html> JavaScript Function Syntax A function is written as a code block (inside curly braces), preceded by the function keyword:
11 function functionname() some code to be executed The code inside the function will be executed when "someone" calls the function. The function can be called directly when an event occurs (like when a user clicks a button), and it can be called from "anywhere" by JavaScript code. Calling a Function with Arguments When you call a function, you can pass along some values to it, these values are called arguments or parameters. These arguments can be used inside the function. You can send as many arguments as you like, separated by commas (,) myfunction(argument1,argument2) Declare the argument, as variables, when you declare the function: functionmyfunction(var1,var2) some code The variables and the arguments must be in the expected order. The first variable is given the value of the first passed argument etc. <p>click the button to call a function with arguments</p> <button onclick="myfunction('harry Potter','Wizard')">Try it</button> functionmyfunction(name,job)
12 alert("welcome " + name + ", the " + job); </body> </html>functions With a Return Value Sometimes you want your function to return a value back to where the call was made. This is possible by using the return statement. When using the return statement, the function will stop executing, and return the specified value. Syntax functionmyfunction() var x=5; return x; The function above will return the value 5. Note: It is not the entire JavaScript that will stop executing, only the function. JavaScript will continue executing code, where the function-call was made from. The function-call will be replaced with the return value: varmyvar=myfunction(); The variable myvar holds the value 5, which is what the function "myfunction()" returns. You can also use the return value without storing it as a variable: document.getelementbyid("demo").innerhtml=myfunction(); The innerhtml of the "demo" element will be 5, which is what the function "myfunction()" returns.
13 You can make a return value based on arguments passed into the function: Calculate the product of two numbers, and return the result: functionmyfunction(a,b) return a*b; document.getelementbyid("demo").innerhtml=myfunction(4,3); Local JavaScript Variables A variable declared (using var) within a JavaScript function becomes LOCAL and can only be accessed from within that function. (the variable has local scope). You can have local variables with the same name in different functions, because local variables are only recognized by the function in which they are declared. Local variables are deleted as soon as the function is completed. Global JavaScript Variables Variables declared outside a function, become GLOBAL, and all scripts and functions on the web page can access it. The Lifetime of JavaScript Variables The lifetime of JavaScript variables starts when they are declared. Local variables are deleted when the function is completed. Global variables are deleted when you close the page. Assigning Values to Undeclared JavaScript Variables If you assign a value to a variable that has not yet been declared, the variable will automatically be declared as a GLOBALvariable. This statement:
14 carname="volvo"; will declare the variable carname as a global variable, even if it is executed inside a function. JavaScript Operators = is used to assign values. + is used to add values. The assignment operator = is used to assign values to JavaScript variables. The arithmetic operator + is used to add values together. Assign values to variables and add them together: y=5; z=2; x=y+z; The result of x will be: 7 JavaScript Arithmetic Operators Arithmetic operators are used to perform arithmetic between variables and/or values. Given that y=5, the table below explains the arithmetic operators: Operator Description Result of x Result of y + Addition x=y Subtraction x=y * Multiplication x=y* / Division x=y/ % Modulus (division remainder) x=y%2 1 5
15 ++ Increment x=++y 6 6 x=y Decrement x=--y 4 4 x=y JavaScript Assignment Operators Assignment operators are used to assign values to JavaScript variables. Given that x=10 and y=5, the table below explains the assignment operators: Ads by Media PlayerAd Options Operator Same As Result = x=y x=5 += x+=y x=x+y x=15 -= x-=y x=x-y x=5 *= x*=y x=x*y x=50 /= x/=y x=x/y x=2 %= x%=y x=x%y x=0 Comparison and Logical operators are used to test for true or false. Comparison Operators Comparison operators are used in logical statements to determine equality or difference between variables or values.
16 Given that x=5, the table below explains the comparison operators: Operator Description Comparing Returns == equal to x==8 false x==5 true === exactly equal to (equal value and equal type) x==="5" false x===5 true!= not equal x!=8 true!== not equal (different value or different type) x!=="5" true x!==5 false > greater than x>8 false < less than x<8 true >= greater than or equal to x>=8 false <= less than or equal to x<=8 true How Can it be Used Comparison operators can be used in conditional statements to compare values and take action depending on the result: if (age<18) x="too young"; You will learn more about the use of conditional statements in the next chapter of this tutorial.
17 Logical Operators Logical operators are used to determine the logic between variables or values. Given that x=6 and y=3, the table below explains the logical operators: Operator Description && and (x < 10 && y > 1) is true or (x==5 y==5) is false! not!(x==y) is true Conditional Operator JavaScript also contains a conditional operator that assigns a value to a variable based on some condition. Syntax variablename=(condition)?value1:value2 Conditional statements are used to perform different actions based on different conditions. Conditional Statements Very often when you write code, you want to perform different actions for different decisions. You can use conditional statements in your code to do this. In JavaScript we have the following conditional statements: if statement - use this statement to execute some code only if a specified condition is true if...else statement - use this statement to execute some code if the condition is true and another code if the condition is false if...else if...else statement - use this statement to select one of many blocks of code to be executed switch statement - use this statement to select one of many blocks of code to be executed
18 If Statement Use the if statement to execute some code only if a specified condition is true. Syntax if (condition) code to be executed if condition is true Note that if is written in lowercase letters. Using uppercase letters (IF) will generate a JavaScript error! Make a "Good day" greeting if the time is less than 20:00: if (time<20) x="good day"; The result of x will be: Good day Try it yourself» Notice that there is no..else.. in this syntax. You tell the browser to execute some code only if the specified condition is true. If...else Statement Use the if...else statement to execute some code if a condition is true and another code if the condition is not true. Syntax if (condition) code to be executed if condition is true else code to be executed if condition is not true
19 The JavaScript Switch Statement Use the switch statement to select one of many blocks of code to be executed. Syntax switch(n) case 1: execute code block 1 break; case 2: execute code block 2 break; default: code to be executed if n is different from case 1 and 2 This is how it works: First we have a single expression n (most often a variable), that is evaluated once. The value of the expression is then compared with the values for each case in the structure. If there is a match, the block of code associated with that case is executed. Use break to prevent the code from running into the next case automatically. <p>click the button to display what day it is today.</p> <button onclick="myfunction()">try it</button> <p id="demo"></p> functionmyfunction() var x; var d=new Date().getDay();
20 switch (d) case 0: x="today is Sunday"; break; case 1: x="today is Monday"; break; case 2: x="today is Tuesday"; break; case 3: x="today is Wednesday"; break; case 4: x="today is Thursday"; break; case 5: x="today is Friday"; break; case 6: x="today is Saturday"; break; document.getelementbyid("demo").innerhtml=x;
21 </body> </html>different Kinds of Loops JavaScript supports different kinds of loops: for - loops through a block of code a number of times for/in - loops through the properties of an object while - loops through a block of code while a specified condition is true do/while - also loops through a block of code while a specified condition is true The For Loop The for loop is often the tool you will use when you want to create a loop. The for loop has the following syntax: for (statement 1; statement 2; statement 3) the code block to be executed Statement 1 is executed before the loop (the code block) starts. Statement 2 defines the condition for running the loop (the code block). Statement 3 is executed each time after the loop (the code block) has been executed. <p>click the button to loop through a block of code five times.</p> <button onclick="myfunction()">try it</button> <p id="demo"></p> functionmyfunction()
22 var x=""; for (vari=0;i<5;i++) x=x + "The number is " + i + "<br>"; document.getelementbyid("demo").innerhtml=x; </body> </html>the For/In Loop The JavaScript for/in statement loops through the properties of an object: <p>click the button to loop through the properties of an object named "person".</p> <button onclick="myfunction()">try it</button> <p id="demo"></p> functionmyfunction() var txt=""; var person=fname:"john",lname:"doe",age:25; for (var x in person)
23 txt=txt + person[x]; document.getelementbyid("demo").innerhtml=txt; </body> </html>the While Loop The while loop loops through a block of code as long as a specified condition is true. Syntax while (condition) code block to be executed The loop in this example will continue to run as long as the variable iis less than 5: <p>click the button to loop through a block of as long as <em>i</em> is less than 5.</p> <button onclick="myfunction()">try it</button> <p id="demo"></p> functionmyfunction()
24 var x="",i=0; while (i<5) x=x + "The number is " + i + "<br>"; i++; document.getelementbyid("demo").innerhtml=x; </body> </html>the Do/While Loop The do/while loop is a variant of the while loop. This loop will execute the code block once, before checking if the condition is true, then it will repeat the loop as long as the condition is true. Syntax do code block to be executed while (condition); The example below uses a do/while loop. The loop will always be executed at least once, even if the condition is false, because the code block is executed before the condition is tested: <p>click the button to loop through a block of as long as <em>i</em> is less than 5.</p> <button onclick="myfunction()">try it</button>
25 <p id="demo"></p> functionmyfunction() var x="",i=0; do x=x + "The number is " + i + "<br>"; i++; while (i<5) document.getelementbyid("demo").innerhtml=x; </body> </html>the Break Statement You have already seen the break statement used in an earlier chapter of this tutorial. It was used to "jump out" of a switch() statement. The break statement can also be used to jump out of a loop. The break statement breaks the loop and continues executing the code after the loop (if any): <p>click the button to do a loop with a break.</p>
26 <button onclick="myfunction()">try it</button> <p id="demo"></p> functionmyfunction() var x="",i=0; for (i=0;i<10;i++) if (i==3) break; x=x + "The number is " + i + "<br>"; document.getelementbyid("demo").innerhtml=x; </body> </html>the try statement lets you test a block of code for errors. The catch statement lets you handle the error. The throw statement lets you create custom errors. Errors Will Happen! When the JavaScript engine is executing JavaScript code, different errors can occur: It can be syntax errors, typically coding errors or typos made by the programmer.
27 It can be misspelled or missing features in the language (maybe due to browser differences). It can be errors due to wrong input, from a user, or from an Internet server. And, of course, it can be many other unforeseeable things. JavaScript Throws Errors When an error occurs, when something goes wrong, the JavaScript engine will normally stop, and generate an error message. The technical term for this is: JavaScript will throw an error. JavaScript try and catch The try statement allows you to define a block of code to be tested for errors while it is being executed. The catch statement allows you to define a block of code to be executed, if an error occurs in the try block. The JavaScript statements try and catch come in pairs. Syntax try //Run some code here catch(err) //Handle errors here s In the example below we have deliberately made a typo in the code in the try block. The catch block catches the error in the try block, and executes code to handle it: <head>
28 var txt=""; function message() try adddlert("welcome guest!"); catch(err) txt="there was an error on this page.\n\n"; txt+="error description: " + err.message + "\n\n"; txt+="click OK to continue.\n\n"; alert(txt); </head> <input type="button" value="view message" onclick="message()"> </body> </html> The Throw Statement The throw statement allows you to create a custom error. The correct technical term is to create or throw an exception. If you use the throw statement together with try and catch, you can control program flow and generate custom error messages. Syntax throw exception The exception can be a JavaScript String, a Number, a Boolean or an Object. This example examines the value of an input variable. If the value is wrong, an exception (error) is thrown. The error is caught by the catch statement and a custom error message is displayed: function myfunction() var y=document.getelementbyid("mess"); y.innerhtml=""; try
29 var x=document.getelementbyid("demo").value; if(x=="") throw "empty"; if(isnan(x)) throw "not a number"; if(x>10) throw "too high"; if(x<5) throw "too low"; catch(err) y.innerhtml="error: " + err + "."; <h1>my First JavaScript</h1> <p>please input a number between 5 and 10:</p> <input id="demo" type="text"> <button type="button" onclick="myfunction()">test Input</button> <p id="mess"></p> JavaScript Form Validation JavaScript can be used to validate data in HTML forms before sending off the content to a server. Form data that typically are checked by a JavaScript could be: has the user left required fields empty? has the user entered a valid address? has the user entered a valid date? has the user entered text in a numeric field? Required Fields The function below checks if a field has been left empty. If the field is blank, an alert box alerts a message, the function returns false, and the form will not be submitted: function validateform() var x=document.forms["myform"]["fname"].value; if (x==null x=="") alert("first name must be filled out"); return false; The function above could be called when a form is submitted:
30 <form name="myform" action="demo_form.asp" onsubmit="return validateform()" method="post"> First name: <input type="text" name="fname"> <input type="submit" value="submit"> </form> Validation The function below checks if the content has the general syntax of an . This means that the input data must contain sign and at least one dot (.). Also, must not be the first character of the address, and the last dot must be present after sign, and minimum 2 characters before the end: function validateform() var x=document.forms["myform"][" "].value; varatpos=x.indexof("@"); vardotpos=x.lastindexof("."); if (atpos<1 dotpos<atpos+2 dotpos+2>=x.length) alert("not a valid address"); return false; The function above could be called when a form is submitted: <form name="myform" action="demo_form.asp" onsubmit="return validateform();" method="post"> <input type="text" name=" "> <input type="submit" value="submit"> </form> JavaScript Objects "Everything" in JavaScript is an Object. In addition, JavaScript allows you to define your own objects. Everything is an Object In JavaScript almost everything is an object. Even primitive datatypes (except null and undefined) can be treated as objects.
31 Booleans can be objects or primitive data treated as objects Numbers can be objects or primitive data treated as objects Strings are also objects or primitive data treated as objects Dates are always objects Maths and Regular Expressions are always objects Arrays are always objects Even functions are always objects JavaScript Objects An object is just a special kind of data, with properties and methods. Accessing Object Properties Properties are the values associated with an object. The syntax for accessing the property of an object is: objectname.propertyname This example uses the length property of the String object to find the length of a string: var message="hello World!"; var x=message.length; The value of x, after execution of the code above will be: 12 Accessing Objects Methods Methods are the actions that can be performed on objects. You can call a method with the following syntax: objectname.methodname() This example uses the touppercase() method of the String object, to convert a text to uppercase: var message="hello world!"; var x=message.touppercase();
32 The value of x, after execution of the code above will be: HELLO WORLD! Creating JavaScript Objects With JavaScript you can define and create your own objects. There are 2 different ways to create a new object: 1. Define and create a direct instance of an object. 2. Use a function to define an object, then create new object instances. Creating a Direct Instance The following example creates a new instance of an object, and adds four properties to it: var person=new Object(); person.firstname="john"; person.lastname="doe"; person.age=50; person.eyecolor="blue"; document.write(person.firstname + " is " + person.age + " years old."); </body> </html>
33 JavaScript Number Object JavaScript has only one type of number. Numbers can be written with, or without decimals. JavaScript Numbers JavaScript numbers can be written with, or without decimals: var pi=3.14; var x=34; // A number written with decimals // A number written without decimals Extra large or extra small numbers can be written with scientific (exponent) notation: var y=123e5; // var z=123e-5; // Octal and Hexadecimal JavaScript interprets numeric constants as octal if they are preceded by a zero, and as hexadecimal if they are preceded by a zero and "x". var y = 0377; var z = 0xFF; By default, Javascript displays numbers as base 10 decimals. But you can use the tostring() method to output numbers as base 16 (hex), base 8 (octal), or base 2 (binary). varmynumber = 128;
34 document.write(mynumber + ' decimal<br>'); document.write(mynumber.tostring(16) + ' hex<br>'); document.write(mynumber.tostring(8) + ' octal<br>'); document.write(mynumber.tostring(2) + ' binary<br>'); </body> </html> Infinity If you calculate a number outside the largest number provided by Javascript, Javascript will return the value of Infinity or -Infinity (positive or negative overflow): mynumber=2; while (mynumber!=infinity) mynumber=mynumber*mynumber; document.write(mynumber +'<BR>'); </body>
35 </html>nan - Not a Number NaN is JavaScript reserved word indicating that the result of a numeric operation was not a number. You can use the global JavaScript function isnan(value) to find out if a value is a number. <p>a number divided by a string is not a number</p> <p>a number divided by a numeric string is a number</p> <p id="demo"></p> var x = 1000 / "Apple"; var y = 1000 / "1000"; document.getelementbyid("demo").innerhtml = isnan(x) + "<br>" + isnan(y); </body> </html> Numbers Can be Numbers or Objects JavaScript numbers can be primitive values created from literals, like var x = 123; JavaScript number can also be objects created with the new keyword, like var y = new Number(123); <p id="demo"></p>
36 var x = 123; // x is a number var y = new Number(123); // y is an object var txt = typeof(x) + " " + typeof(y); document.getelementbyid("demo").innerhtml=txt; </body> </html> Number Methods toexponential() tofixed() toprecision() tostring() valueof() JavaScript String Object JavaScript Strings A string simply stores a series of characters like "John Doe". A string can be any text inside quotes. You can use single or double quotes: varcarname="volvo XC60"; varcarname='volvo XC60'; You can access each character in a string with its position (index): var character=carname[7]; String indexes are zero-based, which means the first character is [0], the second is [1], and so on.
37 String Length The length of a string (a string object) is found in the built in property length: var txt="hello World!"; document.write(txt.length); var txt="abcdefghijklmnopqrstuvwxyz"; document.write(txt.length); Finding a String in a String The indexof() method returns the position (as a number) of the first found occurrence of a specified text inside a string: <p id="p1">click the button to locate where "locate" first occurs.</p> <p id="p2">0</p> <button onclick="myfunction()">try it</button> functionmyfunction() varstr=document.getelementbyid("p1").innerhtml; var n=str.indexof("locate"); document.getelementbyid("p2").innerhtml=n+1; </body>
38 </html> Matching Content The match() method can be used to search for a matching content in a string: varstr="hello world!"; document.write(str.match("world") + "<br>"); document.write(str.match("world") + "<br>"); document.write(str.match("world!")); </body> </html> Replacing Content The replace() method replaces a specified value with another value in a string. <p>click the button to replace "Microsoft" with "W3Schools" in the paragraph below:</p>
39 <p id="demo">please visit Microsoft!</p> <button onclick="myfunction()">try it</button> functionmyfunction() varstr=document.getelementbyid("demo").innerhtml; var n=str.replace("microsoft","w3schools"); document.getelementbyid("demo").innerhtml=n; </body> </html> Strings Can be Strings or Objects JavaScript strings can be primitive values created from literals, like var x = "John"; JavaScript strings can also be objects created with the new keyword, like var y = new String("John"); <p id="demo"></p> var x = "John"; // x is a string
40 var y = new String("John"); // y is an object var txt = typeof(x) + " " + typeof(y); document.getelementbyid("demo").innerhtml=txt; </body> </html> String Properties and Methods Properties: length prototype constructor Methods: charat() charcodeat() concat() fromcharcode() indexof() lastindexof() localecompare() match() replace() search() slice() split() substr() substring() tolowercase() touppercase() tostring() trim() valueof() JavaScript Date Object Complete Date Object Reference For a complete reference of all the properties and methods that can be used with the Date object, go to our complete Date object reference.
41 The reference contains a brief description and examples of use for each property and method! Create a Date Object The Date object is used to work with dates and times. Date objects are created with the Date() constructor. There are four ways of initiating a date: new Date() // current date and time new Date(milliseconds) //milliseconds since 1970/01/01 new Date(dateString) new Date(year, month, day, hours, minutes, seconds, milliseconds) Most parameters above are optional. Not specifying, causes 0 to be passed in. Once a Date object is created, a number of methods allow you to operate on it. Most methods allow you to get and set the year, month, day, hour, minute, second, and milliseconds of the object, using either local time or UTC (universal, or GMT) time. All dates are calculated in milliseconds from 01 January, :00:00 Universal Time (UTC) with a day containing 86,400,000 milliseconds. Some examples of initiating a date: var today = new Date() var d1 = new Date("October 13, :13:00") var d2 = new Date(79,5,24) var d3 = new Date(79,5,24,11,33,0) Set Dates We can easily manipulate the date by using the methods available for the Date object. In the example below we set a Date object to a specific date (14th January 2010): varmydate=new Date(); mydate.setfullyear(2010,0,14); And in the following example we set a Date object to be 5 days into the future: varmydate=new Date(); mydate.setdate(mydate.getdate()+5);
42 Note: If adding five days to a date shifts the month or year, the changes are handled automatically by the Date object itself! Compare Two Dates The Date object is also used to compare two dates. The following example compares today's date with the 14th January 2100: var x=new Date(); x.setfullyear(2100,0,14); var today = new Date(); if (x>today) alert("today is before 14th January 2100"); else alert("today is after 14th January 2100"); JavaScript Boolean Object Create a Boolean Object The Boolean object represents two values: "true" or "false". The following code creates a Boolean object called myboolean: varmyboolean=new Boolean(); If the Boolean object has no initial value, or if the passed value is one of the following: 0-0 null "" false undefined NaN the object is set to false. For any other value it is set to true (even with the string "false")! JavaScript Math Object
43 Math Object The Math object allows you to perform mathematical tasks. The Math object includes several mathematical constants and methods. Syntax for using properties/methods of Math: var x=math.pi; var y=math.sqrt(16); Note: Math is not a constructor. All properties and methods of Math can be called by using Math as an object without creating it. Mathematical Constants JavaScript provides eight mathematical constants that can be accessed from the Math object. These are: E, PI, square root of 2, square root of 1/2, natural log of 2, natural log of 10, base-2 log of E, and base-10 log of E. You may reference these constants from your JavaScript like this: Math.E Math.PI Math.SQRT2 Math.SQRT1_2 Math.LN2 Math.LN10 Math.LOG2E Math.LOG10E Mathematical Methods In addition to the mathematical constants that can be accessed from the Math object there are also several methods available. The following example uses the round() method of the Math object to round a number to the nearest integer: document.write(math.round(4.7)); The code above will result in the following output: 5
44 The following example uses the random() method of the Math object to return a random number between 0 and 1: document.write(math.random()); The code above can result in the following output: The following example uses the floor() and random() methods of the Math object to return a random number between 0 and 10: document.write(math.floor(math.random()*11)); The code above can result in the following output: 1
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