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.
- Return the value property:
- 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:
JavaScript is best known for web page development but it is also used in a variety of non-browser environments. You can learn JavaScript from the ground up by following this JavaScript Tutorial and JavaScript Examples.
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