Lesson 4 More jQuerySelectors

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In Lesson 3, we have learned how to use jQuery selectors based on name, id and class. In this lesson, we shall learn a few more example examples of jQuery selectors.

4.1 The * Selector

We use the symbol * in jQuery to select all elements. the syntax is as follows:

$("*")

Example 4.1

<!DOCTYPE html>
<html>
<head>
<script>
$(document).ready(function(){
    $("#btn1").click(function(){
        $("*").hide();
    });
	 
});
</script>
</head>
<body>
<button id="btn1">Click to hide All Elements</button><br>
</body>
</html>

Clicking the button below will hide everything on this page.

4.2 The Current Element Selector

We use the keyword this to select the current element. The syntax is:

$(this)

Example 4.2

<!DOCTYPE html>
<html>
<head>
<script>
$(document).ready(function(){
    $("#btn2").click(function(){
        $("this").hide();
    });
});
</script>
</head>
<body>
<button id="btn2">Hide Me</button>
</body>
</html>

4.3 Select Elements with the same class name.

we can select all elements with the same class name. The syntax is:

$("element.classname")

Example 4.3

In this example, jQuery will select all p elements with class name "myclass"

<!DOCTYPE html>
<html>
<head>
<script>
$(document).ready(function(){
    $("#btn3").click(function(){
        $("p.myclass").hide();
    });
});
</script>
</head>
<body>
<h1 class="myclass">This is my heading</h1>

<p class="myclass">This is paragraph 1 .</p>
<p class="myclass">This is paragraph 2.</p>

<button id="btn3">Click to hide paragraph</button>
</body>
</html>

This is my heading

This is paragraph 1 .

This is paragraph 2.

4.4 Select the first Element

jQuery can select the first element out of the same elements found on the webpage. The syntax is:

$("element:first")

Example 4.3

This example selects the first <h5> element and hides it.

<!DOCTYPE html>
<html>
<head>
<script>
$(document).ready(function(){
    $("#btn4").click(function(){
        $("h5:first").hide();
    });
});
</script>
</head>
<body>
<h5>First Topic</h5>
<h5>Second Topic</h5>
<h5>Third Topic</h5>
</body>
</html>

First Topic

Second Topic

Third Topic

4.5 Selects the first <li>element of the first <ul></h3>

The syntax is

$("ul li:first")

Example 4.4

<!DOCTYPE html>
<html>
<head>
<script>
$(document).ready(function(){
    $("#btn5").click(function(){
        $("ul li:first").hide();
    });
});
</script>
</head>
<body>
<h4>List of Fruits</h4>
<ul>
  <li>Apple</li>
<li>Banana</li>
  <li>Grape</li>
  <li>Orange</li>
</ul>

<p>List of Vegetables</p>
<ul>
 <li>Broccoli</li>
 <li>Cabbage</li>
  <li>Celery</li>
<li>Tomato</li>
</ul>

<button id="btn5">Strike off the first item</button>
</body>
</html>

List of Fruits

Apple
Banana
Grape
Orange

List of Vegetables

Broccoli
Cabbage
Celery
Tomato

There are many more variations of jQuery selectors and we shall deal with them in coming lessons.

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