Suggested Videos
Part 3 - Benefits of using CDN
Part 4 - jQuery #id selector
Part 5 - jQuery Element Selector
(追記) (追記ここまで)
In this video we will discuss jQuery class selector i.e selecting elements using their class name
(追記) (追記ここまで)
Syntax : $('.class')
jQuery class selectors uses JavaScript's native getElementsByClassName() function if the browser supports it.
Selects all elements with class "small" and sets 5px solid red border
Selects all elements with class "small" or "big" and sets 5px solid red border
Selects all elements with class "small" and all span elements with class "big" and sets 5px solid red border
Selects all elements with class small that are nested in a an element with id=div2 and sets 5px solid red border
Selects all elements with class small and sets 5px solid red border. Notice div1 has 2 classes - small and big.
Selects all elements that has both the classes - small and big. There should be no space between the class names.
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.
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"
jQuery tutorial for beginners
Part 3 - Benefits of using CDN
Part 4 - jQuery #id selector
Part 5 - jQuery Element Selector
(追記) (追記ここまで)
In this video we will discuss jQuery class selector i.e selecting elements using their class name
(追記) (追記ここまで)
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>
<scriptsrc="Scripts/jquery-1.11.2.js"></script>
<scripttype="text/javascript">
$(document).ready(function () {
$('.small').css('border', '5px solid red');
});
</script>
</head>
<body>
<spanclass="small">
Span 1
</span>
<br/><br/>
<divclass="small">
Div 1
</div>
<br/>
<spanclass="big">
Span 2
</span>
<pclass="big">This is a paragraph</p>
</body>
</html>
Selects all elements with class "small" or "big" and sets 5px solid red border
<scripttype="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
<scripttype="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>
<scriptsrc="Scripts/jquery-1.11.2.js"></script>
<scripttype="text/javascript">
$(document).ready(function () {
$('#div2
.small').css('border', '5px solid red');
});
</script>
</head>
<body>
<divid="div1"class="small">
DIV 1
</div>
<br/>
<divid="div2">
Div 2
<br/>
<divclass="small">
DIV 3
</div>
<br/>
<spanclass="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>
<scriptsrc="Scripts/jquery-1.11.2.js"></script>
<scripttype="text/javascript">
$(document).ready(function () {
$('.small').css('border', '5px solid red');
});
</script>
</head>
<body>
<divclass="small
big">
DIV 1
</div>
<br/>
<divclass="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.
<scripttype="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>
<scriptsrc="Scripts/jquery-1.11.2.js"></script>
<scripttype="text/javascript">
$(document).ready(function () {
$('.small
.big').css('border', '5px solid red');
});
</script>
</head>
<body>
<divclass="small
big">
DIV 1
</div>
<br/>
<divclass="small">
DIV 2
<divclass="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"
<scripttype="text/javascript">
$(document).ready(function () {
$('.small').filter('.big').css('border', '5px solid red');
});
</script>
jQuery tutorial for beginners
4 comments:
Learning a lot... Thank you for the tutorial...
Reply DeleteThank you for the tutorial.
Reply DeleteReally very nice thank you for tutorials
Reply Deletethank u sir for make such type of tutorial..
Reply DeleteIt would be great if you can help share these free resources
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