Change width of progress bar with javascript

Question

I try change width of bootstrap progress bar with java script but don't worked.I wrote this code in head section. Please advice.

document.getElementsByClassName("progress-bar").setAttribute("style", "width:50%");
document.getElementsByClassName("progress-bar").style.width = "width:50%";

Html :

<div class="progress">
    <div class="progress-bar" role="progressbar" aria-valuenow="60" aria-valuemin="0" aria-valuemax="100">
    </div>
</div>

document.getElementsByClassName("progress-bar")[0].style.width = "50%"; OR [].forEach.call(document.getElementsByClassName("progress-bar"),function(elem){ elem.style.width="50%" }); — Rayon
– Rayon, Commented Feb 22, 2016 at 11:15
I use this java script code into onload of body tag. I test this way but don't worked — hmahdavi
– hmahdavi, Commented Feb 22, 2016 at 11:18
How many elements are there having class as progress-bar ? — Rayon
– Rayon, Commented Feb 22, 2016 at 11:18

Zakaria Acharki · Accepted Answer · 2016-02-22 11:22:37Z

3

getElementsByClassName() will return a list of nodes, you should specify the index of the one you want to change :

document.getElementsByClassName("progress-bar")[0].setAttribute("style", "width:50%");
document.getElementsByClassName("progress-bar")[0].style.width = "50%";

Hope this helps.

edited Feb 22, 2016 at 11:22

answered Feb 22, 2016 at 11:19

Zakaria Acharki

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1 Comment

hmahdavi Over a year ago

It worked correctly . Is this code works in Internet Explorer?

Medet Tleukabiluly · Accepted Answer · 2016-02-22 11:28:30Z

I would suggest you to use document.querySelector - it returns single element
All major browsers support it

And this is incorrect

document.getElementsByClassName("progress-bar").style.width = "width:50%";
//must be
document.getElementsByClassName("progress-bar").style.width = "50%";

checkout demo below

var percent = 10;
document.querySelector(".progress-bar").style.width = percent + "%";
function increase(){
  percent = percent > 90 ? 10 : percent + 10;
  document.querySelector(".progress-bar").style.width = percent + "%";
}

.progress{
  background: red;
  padding: 3px;
}
.progress-bar{
  background: blue;
  height: 10px;
}

<div class="progress">
    <div class="progress-bar" role="progressbar" aria-valuenow="60" aria-valuemin="0" aria-valuemax="100">
    </div>
</div>
<hr />
<button onclick="increase()">increase</button>

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