jquery - Modify css class with Javascript doesn't work -

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I am currently writing a little chrome extension to modify an existing site. I try to modify a div element if the child has a specialty with value (for example red, blue, ...). If the child has a value with the attribute value red, then I want the original foot color in red.

I have removed this JS: 

  // find parent div element element = element.getElementsByClassName ("existing-category-to-find-div") [ 0]; // Check whether the child is blue from the specialty ... if (color == blue) {element.className + = "RedColorClass"; }

If I elemsent printout with element.outer HTML or className everything is fine and I'm seeing new value. But the actual site is still old value and it has not changed. Do I have to trigger something to refresh the html site?

Use element.classList .add ("RedColorClass") or, If you use jQuery: 

  $ (element) .addClass ("RedColorClass");

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