Why class attribute cannot assign inline by javascript?

 

This question already has an answer here:

  • Change an element's class with JavaScript 30 answers

    • You need to use className .

    Try: 

    div[0].className = "tagging";

    If you want to add tha class to the existing one you can use: 

    div[0].className += " tagging"; // adding white-space is important

    Demo here

    To read: MDN className .

    use className , so change: 

    var div = document.getElementsByTagName("div");
div[0].class = "tagging";

    to 

    var div = document.getElementsByTagName("div");
div[0].className = "tagging";

    Demo:: jsFiddle 

    <div id="div1" class="someclass">
    <img ... id="image1" name="image1" />
</div>
Then

var d = document.getElementById("div1");
d.className = d.className + " otherclass";
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