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This article mainly explains "how to use val in javascript", interested friends may wish to take a look. The method introduced in this paper is simple, fast and practical. Let's learn how to use val in javascript.

In JavaScript val is used to return the value attribute of the first matched element, or to set the value attribute of all matched elements, or to set attribute values using functions with the syntax "$(selector).val()" or "$(selector).val(value)."

Operating environment of this tutorial: Windows 10 system, Javascript version 1.8.5, Dell G3 computer.

What is the use of val in JavaScript?

val() returns or sets the value of the selected element.

The value of an element is set through the value attribute. This method is mostly used for input elements.

If the method has no parameters set, it returns the current value of the selected element.

syntax

$(selector).val(value)

Value is optional. Specifies the new content of the selected element.

Return Value property

Returns the value of the value attribute of the first matching element.

syntax

$(selector).val()

Set the value of the Value property

$(selector).val(value)

value Sets the value of the Value property.

Use the function to set the value of the Value property

$(selector).val(function(index,oldvalue))

function(index,oldvalue) specifies the function that returns the value to be set.

index -Optional. Accepts the index position of the selector.

oldvalue -Optional. Accepts the current Value property of the selector.

Examples are as follows:

$(document).ready(function(){ $("button").click(function(){ $("input:text").val("Bill Gates"); });});

Name:

Set the value of the text field

Output:

After clicking the button:

At this point, I believe that everyone has a deeper understanding of "how to use val in javascript", may wish to actually operate it! Here is the website, more related content can enter the relevant channels for inquiry, pay attention to us, continue to learn!

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