Link for all dot net and sql server video tutorial playlists
Link for slides, code samples and text version of the video
In this video we will discuss jQuery class selector i.e selecting elements using their class name
Syntax : $(‘.class’)
jQuery class selectors uses JavaScript’s native getElementsByClassName() function if the browser supports it.
$(‘.small’) // Selects all elements with class small
$(‘.small,.big’) // Selects all elements with class small or big
$(‘div.small,.big’) // Selects div elements with class small and any element with class big
Selects all elements with class “small” and sets 5px solid red border
[html]
[head]
[title][/title]
[script src=”Scripts/jquery-1.11.2.js”][/script]
[script type=”text/javascript”]
$(document).ready(function () {
$(‘.small’).css(‘border’, ‘5px solid red’);
});
[/script]
[/head]
[body]
[span class=”small”]
Span 1
[/span]
[br /][br /]
[div class=”small”]
Div 1
[/div]
[br /]
[span class=”big”]
Span 2
[/span]
[p class=”big”]This is a paragraph[/p]
[/body]
[/html]
Selects all elements with class “small” or “big” and sets 5px solid red border
[script type=”text/javascript”]
$(document).ready(function () {
$(‘.small, .big’).css(‘border’, ‘5px solid red’);
});
[/script]
Selects all elements with class “small” and all span elements with class “big” and sets 5px solid red border
[script type=”text/javascript”]
$(document).ready(function () {
$(‘.small, span.big’).css(‘border’, ‘5px solid red’);
});
[/script]
Selects all elements with class small that are nested in a an element with id=div2 and sets 5px solid red border
[html]
[head]
[title][/title]
[script src=”Scripts/jquery-1.11.2.js”][/script]
[script type=”text/javascript”]
$(document).ready(function () {
$(‘#div2 .small’).css(‘border’, ‘5px solid red’);
});
[/script]
[/head]
[body]
[div id=”div1″ class=”small”]
DIV 1
[/div]
[br /]
[div id=”div2″]
Div 2
[br /]
[div class=”small”]
DIV 3
[/div]
[br /]
[span class=”small”]
SPAN
[/span]
[/div]
[/body]
[/html]
Selects all elements with class small and sets 5px solid red border. Notice div1 has 2 classes – small and big.
[html]
[head]
[title][/title]
[script src=”Scripts/jquery-1.11.2.js”][/script]
[script type=”text/javascript”]
$(document).ready(function () {
$(‘.small’).css(‘border’, ‘5px solid red’);
});
[/script]
[/head]
[body]
[div class=”small big”]
DIV 1
[/div]
[br /]
[div class=”small”]
DIV 2
[/div]
[/body]
[/html]
Selects all elements that has both the classes – small and big. There should be no space between the class names.
[script type=”text/javascript”]
$(document).ready(function () {
$(‘.small.big’).css(‘border’, ‘5px solid red’);
});
[/script]
If you have a space between the two class names then we are trying to find descendants, i.e. find elements with class big that are descendants of an element with class small.
[html]
[head]
[title][/title]
[script src=”Scripts/jquery-1.11.2.js”][/script]
[script type=”text/javascript”]
$(document).ready(function () {
$(‘.small .big’).css(‘border’, ‘5px solid red’);
});
[/script]
[/head]
[body]
[div class=”small big”]
DIV 1
[/div]
[br /]
[div class=”small”]
DIV 2
[div class=”big”]
DIV 3
[/div]
[/div]
[/body]
[/html]
Another way to selects all elements that has both the classes – small and big is by using filter method. But this approach is slower because it will first create a list of objects with class “small” and then removes elements that does not have class “big”
[script type=”text/javascript”]
$(document).ready(function () {
$(‘.small’).filter(‘.big’).css(‘border’, ‘5px solid red’);
});
[/script]
