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: