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 the input text field.
- attributeValue: This parameter is required. It specifies the value of the attribute to add.
JavaScript setAttribute() Method: This method adds the specified attribute to an element and sets its specified value. If the attribute is already present, then it’s value is set/changed.Â
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.Â
html
<!DOCTYPE html> < html >   < head >     < title >        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:
Set the value of an input field
Example-2: This example sets the value of the input element to ‘defaultValue’ by setAttribute method.Â
html
<!DOCTYPE html> < html >   < head >     < title >         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:
Set the value of an input field
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.