JQuery first selector selects first matched element of its parent in the document. It matches every first element of its parent of particular type. It represents first element, only if it is first child of its parent. It could match more than one matching element, but it would select only single element for each parent. The first selector allows selecting first element immediately inside another element. This tutorial highlights of the JQuery first selector with simple example.
JQuery First Selector Syntax
[code lang=”xml”]
$(“:first”)
[/code]
It defines first selector which selects the first element in the document.
JQuery First Selector Example
[code lang=”xml”]
<!doctype html>
<head>
<title>JQuery First Selector</title>
<script src="http://code.jquery.com/jquery-1.11.0.min.js"></script>
</head>
<h2>JQuery First Selector Example</h2>
<style>
.myclass
{
font-size:15px;
color:red;
}
</style>
<script>
$(document).ready(function(){
$("h3:first").css("color", "green");
});
</script>
<body>
<h3 class="myclass">Hello World!!!</h3>
<h3 class="myclass">Welcome to JQuery.</h3>
<h3 class="myclass">It is JavaScript Library.</h3>
</body>
</html>
[/code]
- As shown in the above program, we have used the code inside $(document).ready which is an event which fires up when document is ready. It will run once the page document object model is ready for JavaScript code to execute.
- $(“h3:first”).css(“color”, “green”); line defines first selector which selects first element of its parent in the document. It uses CSS color property which displays the first element in the green color.
- When we run the above script, we will get above statements on the browser which are defined under body tag. The first element will get display in the green color and next two statements will get display in the red color by using class myclass which sets style property for the elements in the set of matched elements.
JQuery First Selector Demo
When you run the above example, you would get the following output :
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