Set the value of an input field in JavaScript

Sometimes we need to set a default value of the <input> element, This example explains methods to do so.

Text Value Property
This property set/return the value of value attribute of a text field.
The value property contains the default value, the value a user types or a value set by a script.
Syntax:
- Return the value property:
```
textObject.value
```
- Set the value property:
```
textObject.value = text
```
Property Values:
- text:It specifies the value of input text field.
- attributeValue:This parameter is required. It specifies the value of the attribute to add.
setAttribute method
This method adds the specified attribute to an element, and set it’s specified value.
If the attribute already present, then it’s value is set/changed.
Syntax:
```
element.setAttribute(attributeName, attributeValue)
```
Parameters:
- attributeName:This parameter is required. It specifies the name of the attribute to add.
- attributeValue:This parameter is required. It specifies the value of the attribute to add.

Example-1:This example sets the value of the input element to ‘textValue’ by Text Value property.

<!DOCTYPE html> 
<html> 
  
<head> 
    <title> 
        JavaScript  
      | Set the value of an input field. 
    </title> 
</head> 
  
<body style="text-align:center;" id="body"> 
    <h1 style="color:green;">   
            GeeksForGeeks   
        </h1> 
    <input type='text' id='id1' /> 
    <br> 
    <br> 
    <button onclick="gfg_Run()"> 
        click to set 
    </button> 
    <p id="GFG_DOWN" style="color:green;  
                            font-size: 20px; 
                            font-weight: bold;"> 
    </p> 
    <script> 
        var el_down = document.getElementById("GFG_DOWN"); 
        var inputF = document.getElementById("id1"); 
  
        function gfg_Run() { 
            inputF.value = "textValue"; 
            el_down.innerHTML =  
                   "Value = " + "'" + inputF.value + "'"; 
        } 
    </script> 
</body> 
  
</html> 

Output:

Before clicking on the button:
After clicking on the button:

Example-2:This example sets the value of the input element to ‘defaultValue’ by setAttribute method.

<!DOCTYPE html> 
<html> 
  
<head> 
    <title> 
        JavaScript  
      | Set the value of an input field. 
    </title> 
</head> 
  
<body style="text-align:center;" id="body"> 
    <h1 style="color:green;">   
            GeeksForGeeks   
        </h1> 
    <input type='text' id='id1' /> 
    <br> 
    <br> 
    <button onclick="gfg_Run()"> 
        click to set 
    </button> 
    <p id="GFG_DOWN" style="color:green;  
                            font-size: 20px; 
                            font-weight: bold;"> 
    </p> 
    <script> 
        var el_down = document.getElementById("GFG_DOWN"); 
        var inputF = document.getElementById("id1"); 
  
        function gfg_Run() { 
            inputF.setAttribute('value', 'defaultValue'); 
            el_down.innerHTML =  
                   "Value = " + "'" + inputF.value + "'"; 
        } 
    </script> 
</body> 
  
</html> 

Output:

Before clicking on the button:
After clicking on the button:

My Personal Notes

Recommended Posts: