- text() - Sets or returns the text content of selected elements
- html() - Sets or returns the content of selected elements (including HTML markup)
- val() - Sets or returns the value of form fields
Wednesday, May 28, 2014
jQuery methods for DOM manipulation
jQuery Method Chaining
<html>
<head>
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>
<script>
$(document).ready(function()
{
$("button").click(function(){
$("#p1").css("color","red").slideUp(2000).slideDown(2000);
});
});
</script>
</head>
<body>
<p id="p1">jQuery is fun!!</p>
<button>Click me</button>
</body>
</html>
<head>
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>
<script>
$(document).ready(function()
{
$("button").click(function(){
$("#p1").css("color","red").slideUp(2000).slideDown(2000);
});
});
</script>
</head>
<body>
<p id="p1">jQuery is fun!!</p>
<button>Click me</button>
</body>
</html>
jQuery Callback Functions
1) JavaScript statements are executed line by line.
2) However, with effects, the next line of code can be run even though the effect is not finished.
3) This can create errors.
4) To prevent this, you can create a callback function.
Typical syntax: $(selector).hide(speed,callback);
5) function that will be executed after the hide effect is completed
$("button").click(function(){
$("p").hide("slow",function(){
alert("The paragraph is now hidden");
});
});
6) The example below has no callback parameter, and the alert box will be displayed before the hide effect is completed
$("button").click(function(){
$("p").hide(1000);
alert("The paragraph is now hidden");
});
2) However, with effects, the next line of code can be run even though the effect is not finished.
3) This can create errors.
4) To prevent this, you can create a callback function.
Typical syntax: $(selector).hide(speed,callback);
5) function that will be executed after the hide effect is completed
$("button").click(function(){
$("p").hide("slow",function(){
alert("The paragraph is now hidden");
});
});
6) The example below has no callback parameter, and the alert box will be displayed before the hide effect is completed
$("button").click(function(){
$("p").hide(1000);
alert("The paragraph is now hidden");
});
Tuesday, May 27, 2014
jQuery stop() Method : used to stop an animation or effect before it is finished.
Syntax:
$(selector).stop(stopAll,goToEnd);
$(selector).stop(stopAll,goToEnd);
The optional stopAll parameter specifies whether also the animation queue should be cleared or not. Default is false, which means that only the active animation will be stopped, allowing any queued animations to be performed afterwards.
The optional goToEnd parameter specifies whether or not to complete the current animation immediately. Default is false.
<html>
<head>
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>
<script>
$(document).ready(function(){
$("#flip").click(function(){
$("#panel").slideDown(5000);
});
$("#stop").click(function(){
$("#panel").stop();
});
});
</script>
<style>
#panel,#flip
{
padding:5px;
text-align:center;
background-color:#e5eecc;
border:solid 1px #c3c3c3;
}
#panel
{
padding:50px;
display:none;
}
</style>
</head>
<body>
<button id="stop">Stop sliding</button>
<div id="flip">Click to slide down panel</div>
<div id="panel">Hello world!</div>
</body>
</html>
example below first moves the div element to the right, and then increases the font size of the text
<html>
<head>
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>
<script>
$(document).ready(function(){
$("button").click(function(){
var div=$("div");
div.animate({left:'100px'},"slow");
div.animate({fontSize:'3em'},"slow");
});
});
</script>
</head>
<body>
<button>Start Animation</button>
<p>By default, all HTML elements have a static position, and cannot be moved. To manipulate the position, remember to first set the CSS position property of the element to relative, fixed, or absolute!</p>
<div style="background:#98bf21;height:100px;width:200px;position:absolute;">HELLO</div>
</body>
</html>
<head>
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>
<script>
$(document).ready(function(){
$("button").click(function(){
var div=$("div");
div.animate({left:'100px'},"slow");
div.animate({fontSize:'3em'},"slow");
});
});
</script>
</head>
<body>
<button>Start Animation</button>
<p>By default, all HTML elements have a static position, and cannot be moved. To manipulate the position, remember to first set the CSS position property of the element to relative, fixed, or absolute!</p>
<div style="background:#98bf21;height:100px;width:200px;position:absolute;">HELLO</div>
</body>
</html>
jQuery animate() : perform different animations after each other, we take advantage of the queue functionality
<html>
<head>
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>
<script>
$(document).ready(function(){
$("button").click(function(){
var div=$("div");
div.animate({height:'300px',opacity:'0.4'},"slow");
div.animate({width:'300px',opacity:'0.8'},"slow");
div.animate({height:'100px',opacity:'0.4'},"slow");
div.animate({width:'100px',opacity:'0.8'},"slow");
});
});
</script>
</head>
<body>
<button>Start Animation</button>
<p>By default, all HTML elements have a static position, and cannot be moved. To manipulate the position, remember to first set the CSS position property of the element to relative, fixed, or absolute!</p>
<div style="background:#98bf21;height:100px;width:100px;position:absolute;">
</div>
</body>
</html>
<head>
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>
<script>
$(document).ready(function(){
$("button").click(function(){
var div=$("div");
div.animate({height:'300px',opacity:'0.4'},"slow");
div.animate({width:'300px',opacity:'0.8'},"slow");
div.animate({height:'100px',opacity:'0.4'},"slow");
div.animate({width:'100px',opacity:'0.8'},"slow");
});
});
</script>
</head>
<body>
<button>Start Animation</button>
<p>By default, all HTML elements have a static position, and cannot be moved. To manipulate the position, remember to first set the CSS position property of the element to relative, fixed, or absolute!</p>
<div style="background:#98bf21;height:100px;width:100px;position:absolute;">
</div>
</body>
</html>
jQuery animate() - Using Pre-defined Values as "show", "hide", or "toggle":
<html>
<head>
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>
<script>
$(document).ready(function(){
$("button").click(function(){
$("div").animate({
height:'toggle'
});
});
});
</script>
</head>
<body>
<button>Start Animation</button>
<p>By default, all HTML elements have a static position, and cannot be moved. To manipulate the position, remember to first set the CSS position property of the element to relative, fixed, or absolute!</p>
<div style="background:#98bf21;height:100px;width:100px;position:absolute;">
</div>
</body>
</html>
<head>
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>
<script>
$(document).ready(function(){
$("button").click(function(){
$("div").animate({
height:'toggle'
});
});
});
</script>
</head>
<body>
<button>Start Animation</button>
<p>By default, all HTML elements have a static position, and cannot be moved. To manipulate the position, remember to first set the CSS position property of the element to relative, fixed, or absolute!</p>
<div style="background:#98bf21;height:100px;width:100px;position:absolute;">
</div>
</body>
</html>
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