HTML | required Attribute

It is a Boolean attribute which is used to specify that the input element must be filled out before submitting the Form.

Elements: This attributes can be associated with three elements which are listed below:

  • <input>
  • <select>
  • <textarea>
    <input>: The required attributes can be use in <input> elements.

  • Syntax: 
    <input required>
  • Example-1:
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    <!DOCTYPE html>
    <html>
        <head>
            <title>required Attribute</title>
            <style>
                h1, h2 {
                    color:green;
                    font-style:italic;
                }
                body {
                    text-align:center;
                }
            </style>
        </head>
        <body>
            <h1>GeeksForGeeks</h1>
            <h2>required attribute in input Field</h2>
            <form action="">
                Username: 
                <input type="text" name="usrname" required>
                <br>
                Password:
                <input type="password"name="password">
                <br>
                <input type="submit">
            </form>
        </body>
    </html>                    

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  • Output:
    
Image
    • 

    <select>: This elements can also use required attributes.
    

  • Syntax:

    <select required>
    

    • 

  • Example-2:

    

    

    

    

    
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    <!DOCTYPE html> 
    

    <html> 
    

        <head> 
    

            <title>required Attribute</title> 
    

            <style> 
    

                h1, h2 { 
    

                    color:green; 
    

                    font-style:italic; 
    

                } 
    

                body { 
    

                    text-align:center; 
    

                } 
    

            </style> 
    

        </head> 
    

        <body> 
    

            <h1>GeeksForGeeks</h1> 
    

            <h2>required attribute in select Field</h2> 
    

            <form action=""> 
    

                <select required> 
    

                    <option value="">None</option> 
    

                    <option value="ds">Data Structure</option> 
    

                    <option value="algo">Algorithm</option> 
    

                    <option value="os">Operating System</option> 
    

                    <option value="cn">Computer Network</option> 
    

                </select> 
    

                <input type="submit"> 
    

            </form> 
    

        </body> 
    

    </html>                     
    

    
    		

    
    

    

    

    

    

    

    
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  • 
Output:
    
Image
    • 

    <textarea>: This elements can also use required attributes.
    

  • Syntax:

    <textarea required>
    

    • 

  • Example-3:

    

    

    

    

    
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                                        edit
    
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                                        link
    
                                    brightness_4
    
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    <!DOCTYPE html> 
    

    <html> 
    

        <head> 
    

            <title>required Attribute</title> 
    

            <style> 
    

                h1, h2 { 
    

                    color:green; 
    

                    font-style:italic; 
    

                } 
    

                body { 
    

                    text-align:center; 
    

                } 
    

            </style> 
    

        </head> 
    

        <body> 
    

            <h1>GeeksForGeeks</h1> 
    

            <h2>required attribute in Textarea Field</h2> 
    

            <form action=""> 
    

                <textarea rows="7" cols="50" 
    

                                 name="comment" required> 
    

                </textarea> 
    

                <input type="submit"> 
    

            </form> 
    

        </body> 
    

    </html>                     
    

    
    		

    
    

    

    

    

    

    

    
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  • Output:
    
Image
    • 



Supported Browsers: The browser supported by required attribute are listed below:


    

  • Google Chrome 5.0+
    • 

  • Internet Explorer 11.0+
    • 

  • Firefox 4+
    • 

  • Opera 9.7+
    • 




          
          
          
          

            

    

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