How to change style attribute of an element dynamically using JavaScript ?

Given an HTML document and the task is to change the style properties (CSS Properties) of an element dynamically with the help of JavaScript.

Approach:

  • Select the element whose style properties needs to be change.
  • Use element.style property to set the style attribute of an element.
  • Set the properties either by using bracket notation or dash notation.

Example 1: This example changing the color and background-color of heading element.



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<!DOCTYPE HTML> 
<html> 
  
<head> 
    <title> 
        How to change style attribute of an element
        dynamically using JavaScript ?
    </title>
</head> 
  
<body style = "text-align:center;" id = "body"> 
      
    <h1 id = "h1" style = "color:green;" > 
        GeeksforGeeks 
    </h1>
      
    <p id = "GFG_UP" style = 
            "font-size: 15px; font-weight: bold;">
    </p>
          
    <button onclick = "gfg_Run()"> 
        Click here
    </button>
      
    <p id = "GFG_DOWN" style = 
        "font-size: 23px; font-weight: bold; color: green; ">
    </p>
      
    <script>
        var el_up = document.getElementById("GFG_UP");
        var el_down = document.getElementById("GFG_DOWN");
        var heading = document.getElementById("h1");
        el_up.innerHTML = "Click on the button to "
                        + "change the style attribute";
          
        function gfg_Run() {
            heading.style["background-color"] = "green";
            heading.style["color"] = "white";
            el_down.innerHTML = "Style Attribute Changed";
        }         
    </script> 
</body> 
  
</html>

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Output:


    

  • Before clicking on the button:
    

    • 

  • After clicking on the button:
    

    • 



Example 2: This example changing the color, background-color and width property of elements.











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<!DOCTYPE HTML>  


<html>  


  


<head>  


    <title>  


        How to change style attribute of an element 


        dynamically using JavaScript ? 


    </title> 


</head>  


  


<body>  


    <center> 


        <h1 id = "h1" style = "color:green;" >  


            GeeksforGeeks  


        </h1> 


          


        <p id = "GFG_UP" style =  


                "font-size: 15px; font-weight: bold;"> 


        </p> 


              


        <button onclick = "gfg_Run()">  


            Click here 


        </button> 


          


        <p id = "GFG_DOWN" style =  


            "font-size: 23px; font-weight: bold; color: green; "> 


        </p> 


          


        <script> 


            var el_up = document.getElementById("GFG_UP"); 


            var el_down = document.getElementById("GFG_DOWN"); 


            var heading = document.getElementById("h1"); 


            el_up.innerHTML = "Click on the button to " 


                            + "change the style attribute"; 


              


            function gfg_Run() { 


                heading.style["color"] = "white"; 


                heading.style["background-color"] = "green"; 


                heading.style["width"] = "300px"; 


                heading.style["border"] = "1px solid black"; 


                  


                el_up.style["background-color"] = "green"; 


                el_up.style["width"] = "400px"; 


                el_up.style["border"] = "1px solid black"; 


                  


                el_down.innerHTML = "Style Attribute Changed"; 


            }          


        </script>  


    </center> 


</body>  


  


</html> 



















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Output:


    

  • 
Before clicking on the button:
    

    • 

  • After clicking on the button:
    

    • 



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