Jquery get index

Jquery get index DEFAULT

jQuery Misc index() Method

❮ jQuery Misc Methods

Example

Get the index of the clicked <li> element, relative to its siblings:


  alert($(this).index());
});

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Definition and Usage

The index() method returns the index position of specified elements relative to other specified elements.

The elements can be specified by jQuery selectors, or a DOM element.

Note: If the element is not found, index() will return -1.


Index of First Matched Element, Relative to Sibling elements.

Get the index position of the first matched selected element relative to its sibling elements.

Syntax


Index of an Element, Relative to the Selector.

Get the index position of an element, relative to the selector.

The element can be specified using a DOM element, or a jQuery selector.

Syntax


ParameterDescription
elementOptional. Specifies the element to get the index position of. Can be a DOM element or a jQuery selector

❮ jQuery Misc Methods


Sours: https://www.w3schools.com/jquery/misc_index.asp

jQuery | index() with examples

The index() is an inbuilt method in jQuery which is used to return the index of the a specified elements with respect to selector.
Syntax:

$(selector).index(element)

Parameter: It accepts an optional parameter “element” which is used to get the position of the element.
Return value: It returns an integer denoting the index of the specified element.

jQuery code to show the working of index() function:

Code #1:

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Output:
Before clicking on any element on the list

Click on the elements of the list to display their index number with respect to the other elements in the list.



After clicking on “for”-

Click on the elements of the list to display their index number with respect with the other elements in the list.

Clicked Index 1

Code #2:

 

Output:
Before clicking on any element on the list-

Click on the elements of the list to display their index number with respect with the other elements in the list.

After clicking on any element of the list-

Click on the elements of the list to display their index number with respect with the other elements in the list.

Clicked Index 1


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jQuery index() method

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The index() method is used to return the index value of the element with respect to the selector. The method will return -1 if the element is not found.

Syntax

Index of the first matched element, relative to siblings

If no argument is passed to the index() method, the method will return an integer representing the position of the first element in the jQuery object relative to its siblings.

Index of an element, relative to selector

This method accepts an optional parameter, which is defined as follows -

element: This is an optional parameter that can be a jQuery selector or a DOM element. It specifies the element to get the index position of.

Suppose we pass a DOM element as an argument and using the index() method on the set of elements. In that case, the method will return an integer representing the position of the passed element relative to the original set.

On passing a selector string as an argument, the index() method will return an integer representing the position of the first element in the jQuery object relative to the elements matched by the selector.

Example

In this example, we are using the index() method to get the index value of the paragraph elements. Here, we are using the method with or without arguments. So, on clicking the paragraph element, we will get the index of the corresponding paragraph according to the syntax. The index starts with 0.

Here, the color names are the paragraph elements.

Test it Now

Output

jQuery index() method

On clicking the paragraph, the index of the corresponding paragraph element will be displayed according to the syntax, as shown in the below screenshot.

jQuery index() method

As we can see the index of paragraph with id p1 is 0. This is because the index starts with 0.


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