Web Engineering (Lecture 06) JavaScript part 2
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1 Web Engineering (Lecture 06) JavaScript part 2 By: Mr. Sadiq Shah Lecturer (CS) Class BS(IT)-6 th semester
2 JavaScript Events HTML events are "things" that happen to HTML elements. javascript lets you execute code when events are detected. When JavaScript is used in HTML pages, JavaScript can "react" on these events. Here are some examples of HTML events: An HTML web page has finished loading An HTML input field was changed An HTML button was clicked
3 html> JavaScript Events Example of button and Date() <body> <button onclick="document.getelementbyid('demo').innerhtml=date()"> The time</button> <p id="demo"></p> </body> </html>
4 ondblclick Event <body> <p ondblclick="myfunction()">double-click this paragraph to trigger a function.</p> <p id="demo">display message</p> <script> function myfunction() { document.getelementbyid("demo").innerhtml = "Hello World"; } </script> </body>
5 onmouseover Event <body> <img onmouseover="bigimg(this)" onmouseout="normalimg(this)" border="0" src="smiley.gif" width="32" height="32"> <p>the function bigimg() is triggered on mouse over</p> <p>the function normalimg() is triggered on mouse out image.</p> <script> function bigimg(x) { x.style.height = "64px"; x.style.width = "64px"; } function normalimg(x) { x.style.height = "32px"; x.style.width = "32px"; } </script></body>
6 onkeydown Event <body> <p>a function is triggered when the user is pressing a key in the input field.</p> <input type="text" onkeydown="myfunction()"> <script> function myfunction() { } window.alert("you pressed a key inside the input field"); </script> </body>
7 onkeypress Event <body> <p>a function is triggered when the user is pressing a key in the input field.</p> <input type="text" onkeypress="myfunction()"> <script> function myfunction() { window.alert("you pressed a key inside the input field"); } </script>
8 onload event When the page has been loaded <head> <script> function myfunction() { window.alert("page is loaded"); } </script> </head> <body onload="myfunction()"> <h1>hello World!</h1> </body>
9 Onfocus event onfocus - When an input field gets focus <head> <script> function myfunction(x) { x.style.background = "yellow"; } </script> </head> <body> Enter your name: <input type="text" onfocus="myfunction(this)"> <p>when the input field gets focus, a function is triggered which changes the background-color.</p> </body>
10 Lab Task 03 Marks 02 Try These commands onkeypress Event onkeyup Event
11 JavaScript Data Types JavaScript variables can hold many data types: numbers, strings, arrays, objects JavaScript Has Dynamic Types This means that the same variable can be used as different types var x; // Now x is undefined var x = 5; // Now x is a Number var x = "John"; // Now x is a String A string (or a text string) is a series of characters like bs program".
12 JavaScript Arrays JavaScript arrays are written with square brackets. Array items are separated by commas. <body> <p id="demo"></p> <script> var cars = ["Saab","Volvo","BMW"]; document.getelementbyid("demo").innerhtml = cars[0]; </script> </body>
13 JavaScript Functions A JavaScript function is a block of code designed to perform a particular task. A JavaScript function is executed when "something" invokes it (calls it). JavaScript Function Syntax A JavaScript function is defined with the function keyword, followed by a name, followed by parentheses (). Example; function name(parameter1, parameter2, parameter3) { code to be executed }
14 JavaScript Functions Function parameters are the names listed in the function definition. Function arguments are the real values received by the function when it is invoked. Inside the function, the arguments (the parameters) behave as local variables. Function Return When JavaScript reaches a return statement, the function will stop executing.
15 Function example <body> <h1>javascript Functions</h1> <p>this example calls a function which performs a calculation and returns the result:</p> <p id="demo"></p> <script> function myfunction(a, b) { return a * b; } document.getelementbyid("demo").innerhtml = myfunction(4, 3); </script> </body>
16 end
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