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HTML | DOM Input Number required Property
  • Difficulty Level : Basic
  • Last Updated : 16 Apr, 2019

The DOM Input Number required Property in HTML DOM is used to set or return whether Input number Field should be filled or not when submitting the form. This property is used to reflect the HTML required attribute.

Syntax:

  • It returns the Input number required property.
    numberObject.required
  • It is used to set the Input number required property.
    numberObject.required = true|false
  • Property Values:

    • true: It specifies that the number field must be filled out before submitting the form.
    • false: It is the default value. It specifies that the number field must not be filled out before submitting the form.

    Return Value: It returns a Boolean value which represents that the number Field must be filled or not before submitting the form.

    Example 1: This example illustrates how to return Input number required property.



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    <DOCTYPE html> 
    <html
      
        <body style="text-align:center;"
      
            <h1 style="color:green;"
                GeeksForGeeks 
            </h1
      
            <h2>DOM Input Number required Property</h2
      
            <input type="number"
                id="myNumber" step="5"
                placeholder="multiples of 5"  required> <br><br>
            <button onclick="myFunction()"
                Click Here! 
            </button
      
            <p id="demo" style="font-size:23px;color:green;"></p
      
            <script
                function myFunction() { 
                      
                    // Accessing input value 
                    var x = 
                    document.getElementById("myNumber").required; 
                    document.getElementById("demo").innerHTML = x; 
                
            </script
      
        </body
      
    </html>                    

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    Output:
    Before Clicking On Button:

    After Clicking On Button:

    Example-2: This Example illustrates how to set the Input number required Property.

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    <DOCTYPE html> 
    <html
      
        <body style="text-align:center;"
      
            <h1 style="color:green;"
                GeeksForGeeks 
            </h1
      
            <h2>DOM Input Number required Property</h2
      
            <input type="number"
                id="myNumber" step="5"
                placeholder="multiples of 5"  required> <br><br>
            <button onclick="myFunction()"
                Click Here! 
            </button
      
            <p id="demo" style="font-size:23px;color:green;"></p
      
            <script
                function myFunction() { 
                      
                    // Accessing input value 
                    var x = 
                    document.getElementById("myNumber").required = false; 
                    document.getElementById("demo").innerHTML = x; 
                
            </script
      
        </body
      
    </html>                    

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    Output :

    Before Clicking On Button:

    After Clicking On Button:

    Supported Browsers: The browser supported by DOM input number required Property are listed below:

    • Google Chrome
    • Internet Explorer 10.0 +
    • Firefox
    • Opera
    • Safari

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