Set element value html

HTML DOM Element setAttribute()

The setAttribute() method sets a new value to an attribute.

If the attribute does not exist, it is created first.

See Also:

Tutorial:

Syntax

Parameters

Parameter	Description
name	Required. The name of the attribute.
value	Required. The new attribute value.

Return Value

Note

It is possible to add a style attribute with a value to an element, but it is not recommended because it can overwrite other properties in the style attribute.

NO:

YES:

More Examples

Change an input field to an input button:

Add a href attribute to an element:

Change the value of the target attribute to «_self»:

Browser Support

element.setAttribute() is a DOM Level 1 (1998) feature.

It is fully supported in all browsers:

Chrome	Edge	Firefox	Safari	Opera	IE
Yes	Yes	Yes	Yes	Yes	9-11

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Element: setAttribute() method

Sets the value of an attribute on the specified element. If the attribute already exists, the value is updated; otherwise a new attribute is added with the specified name and value.

To get the current value of an attribute, use getAttribute() ; to remove an attribute, call removeAttribute() .

Syntax

Parameters

A string specifying the name of the attribute whose value is to be set. The attribute name is automatically converted to all lower-case when setAttribute() is called on an HTML element in an HTML document.

A string containing the value to assign to the attribute. Any non-string value specified is converted automatically into a string.

Boolean attributes are considered to be true if they’re present on the element at all. You should set value to the empty string ( «» ) or the attribute’s name, with no leading or trailing whitespace. See the example below for a practical demonstration.

Since the specified value gets converted into a string, specifying null doesn’t necessarily do what you expect. Instead of removing the attribute or setting its value to be null , it instead sets the attribute’s value to the string «null» . If you wish to remove an attribute, call removeAttribute() .

Return value

Exceptions

The specified attribute name contains one or more characters which are not valid in attribute names.

Examples

In the following example, setAttribute() is used to set attributes on a .

HTML

button  height: 30px; width: 100px; margin: 1em; > 

JavaScript

const button = document.querySelector("button"); button.setAttribute("name", "helloButton"); button.setAttribute("disabled", ""); 

This demonstrates two things:

• The first call to setAttribute() above shows changing the name attribute’s value to «helloButton». You can see this using your browser’s page inspector (Chrome, Edge, Firefox, Safari).
• To set the value of a Boolean attribute, such as disabled , you can specify any value. An empty string or the name of the attribute are recommended values. All that matters is that if the attribute is present at all, regardless of its actual value, its value is considered to be true . The absence of the attribute means its value is false . By setting the value of the disabled attribute to the empty string ( «» ), we are setting disabled to true , which results in the button being disabled.

DOM methods dealing with element’s attributes:

Not namespace-aware, most commonly used methods	Namespace-aware variants (DOM Level 2)	DOM Level 1 methods for dealing with Attr nodes directly (seldom used)	DOM Level 2 namespace-aware methods for dealing with Attr nodes directly (seldom used)
setAttribute (DOM 1)	setAttributeNS	setAttributeNode	setAttributeNodeNS
getAttribute (DOM 1)	getAttributeNS	getAttributeNode	getAttributeNodeNS
hasAttribute (DOM 2)	hasAttributeNS	—	—
removeAttribute (DOM 1)	removeAttributeNS	removeAttributeNode	—

Specifications

Browser compatibility

BCD tables only load in the browser

Gecko notes

Using setAttribute() to modify certain attributes, most notably value in XUL, works inconsistently, as the attribute specifies the default value. To access or modify the current values, you should use the properties. For example, use Element.value instead of Element.setAttribute() .

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JavaScript HTML DOM — Changing HTML

The HTML DOM allows JavaScript to change the content of HTML elements.

Changing HTML Content

The easiest way to modify the content of an HTML element is by using the innerHTML property.

To change the content of an HTML element, use this syntax:

This example changes the content of a

element:

Example

• The HTML document above contains a

  element with id=»p1″

• We use the HTML DOM to get the element with id=»p1″
• A JavaScript changes the content ( innerHTML ) of that element to «New text!»

This example changes the content of an element:

Example

• The HTML document above contains an element with id=»id01″
• We use the HTML DOM to get the element with id=»id01″
• A JavaScript changes the content ( innerHTML ) of that element to «New Heading»

Changing the Value of an Attribute

To change the value of an HTML attribute, use this syntax:

This example changes the value of the src attribute of an element:

Example

• The HTML document above contains an element with id=»myImage»
• We use the HTML DOM to get the element with id=»myImage»
• A JavaScript changes the src attribute of that element from «smiley.gif» to «landscape.jpg»

Dynamic HTML content

JavaScript can create dynamic HTML content:

Example

document.write()

In JavaScript, document.write() can be used to write directly to the HTML output stream:

Example

Never use document.write() after the document is loaded. It will overwrite the document.

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How to add the value of the element in HTML?

This article will teach you how to add the value of the element in HTML. We have a basic idea about the value attribute in HTML and the situations where we use the value attribute Let’s look forward to a better understanding of the HTML value attribute.

For various types of input, it has a distinct meaning:

• It specifies the text on the button when it is present in «button,» «reset,» and «submit.»
• It specifies the initial value of the input field when it is present in the «text,» «password,» and «hidden» values.
• When «checkbox,» «radio,» and «picture» are present, it indicates the value connected to the input.

HTML tag

The clickable button in HTML is defined by the tag. The content is sent using the tag. The tag can contain graphics and text information. Different default types for «button» are used by various browsers.

Example

In the following example we are creating two tag for subjects where one acts as HTML subject button and another one acts as JAVA subject button.

    
Choose The Subject: HTML JAVA 
   

HTML tag

The tag designates a field for user-enterable data. The most significant form element is the element. Depending on the type attribute, the element can be presented in a number of different ways.

Example

Considering the following example, where we are using HTML form with tag with default values

When the above script is run, it will produce an output that includes an input field displaying default values for the first name and last name using the value attribute along with a submit button on the webpage.

and . The list items in
are typically represented by numbers or letters.

Example

Consider the following example we are using the value attribute in the ordered list.

On running the above script, the output window will pop up, displaying the ordered list of different cars used in the script, starting with number 100 as we mentioned value=»100″ on the webpage.

Using Script

In the following example we are running a script to change the value of textfield.

Example

   Name: 
Click To Change Value
 Click function mytutorial1()  

When the script gets executed, it will generate an output consisting of an input field with a value =»thor» along with a click button. When the user clicks the button, the event gets triggered and changes the input value=»black widow» on the webpage.

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