How to use input readonly attribute in jQuery ?

Last Updated : 03 Aug, 2021

Use jQuery methods to add the readonly attribute to the form input field.

jQuery attr() Method: This method set/return attributes and values of the selected elements. If this method is used to return the attribute value, it returns the value of the first selected element.If this method is used to set attribute values, it sets one or more than one attribute/value pairs for the set of selected elements. Syntax:
- Return the value of an attribute:
```
$(selector).attr(attribute)
```
- Set the attribute and value:
```
$(selector).attr(attribute, value)
```
- Set attribute and value using a function:
```
$(selector).attr(attribute, function(index, currentvalue))
```
- Set multiple attributes and values:
```
$(selector).attr({attribute:value, attribute:value, ...})
```
Parameters:
- attribute: This parameter specifies the name of the attribute.
- value: This parameter specifies the value of the attribute.
- function(index, currentvalue): This parameter specifies a function that returns the attribute value to set.
  - index: This parameter receives the index position of element in the set.
  - currentValue: This parameter receives the current attribute value of selected elements.
jQuery prop() Method: This method set/return properties and values of the matched elements. If this method is used to set or return the property value, it returns the value of the first selected element. If this method is used to set property values, it sets one or more property/value pairs for the set of selected elements. Syntax:
- Return the value of an property:
```
$(selector).prop(property)
```
- Set the property and value:
```
$(selector).prop(property, value)
```
- Set property and value using a function:
```
$(selector).prop(property, function(index, currentvalue))
```
- Set multiple properties and values:
```
$(selector).prop({property:value, property:value, ...})
```
Parameters:
- property: This parameter specifies the name of the property.
- value: This parameter specifies the value of the property.
- function(index, currentvalue): This parameter specifies a function that returns the property value to set.
  - index: This parameter receives the index position of element in the set.
  - currentValue: This parameter receives the current property value of selected elements.

Example 1: In this example the read-only attribute of form input text field is enabled by using attr() method.

html

<!DOCTYPE HTML> 
<html> 
    <head> 
        <title> 
            Add a readonly attribute to an input field
        </title>
        
        <script src = 
"https://ajax.googleapis.com/ajax/libs/jquery/3.4.0/jquery.min.js">
        </script>
    </head> 
    
    <body style = "text-align:center;"> 
    
        <h1 style = "color:green;" > 
            GeeksForGeeks 
        </h1>
        
        <p style = "font-size: 15px; font-weight: bold;">
            The readonly attribute is added to input box
            on click on the button.
        </p>
        
        <form>
            Input : <input type="text" name="input_field" />
        </form>
        <br>
        
        <button onclick = "GFG_Run()">
            click here
        </button>
        
        <p id = "GFG_down" style = 
            "color: green; font-size: 20px; font-weight: bold;">
        </p>
        
        <script>
            function GFG_Run() {
                
                $('input').attr('readonly', true);
                document.getElementById("GFG_down").innerHTML 
                        = "Read-Only attribute enabled";
            }
        </script> 
    </body> 
</html>

Output:

Before click on the button:
After click on the button:

Example 2: In this example the read-only attribute of form input text field is enabled by using prop() method .

html

<!DOCTYPE HTML> 
<html> 
    <head> 
        <title> 
            Add a readonly attribute to an input tag
        </title>
        
        <script src = 
"https://ajax.googleapis.com/ajax/libs/jquery/3.4.0/jquery.min.js">
        </script>
    </head> 
    
    <body style = "text-align:center;">
         
        <h1 style = "color:green;" > 
            GeeksForGeeks 
        </h1>
        
        <p style = "font-size: 15px; font-weight: bold;">
            The readonly attribute is added to input box
            on click on the button.
        </p>
        
        <form>
            Input : <input type="text" name="input_field" />
        </form>
        <br>
        
        <button onclick = "GFG_Run()">
            click here
        </button>
        
        <p id = "GFG_down" style = 
            "color: green; font-size: 20px; font-weight: bold;">
        </p>
        
        <script>
            function GFG_Run() {
                $('input').prop('readonly', true);
                document.getElementById("GFG_down").innerHTML
                        = "Read-Only attribute enabled";
            }
        </script> 
    </body> 
</html>

Output:

Before click on the button:
After click on the button:

jQuery is an open source JavaScript library that simplifies the interactions between an HTML/CSS document, It is widely famous with it's philosophy of “Write less, do more". You can learn jQuery from the ground up by following this jQuery Tutorial and jQuery Examples.