Determine Pixel Length of String in Javascript/jQuery?

Wrap text in a span and use jquery width()

I don't believe you can do just a string, but if you put the string inside of a <span> with the correct attributes (size, font-weight, etc); you should then be able to use jQuery to get the width of the span.

<span id='string_span' style='font-weight: bold; font-size: 12'>Here is my string</span>
<script>
  $('#string_span').width();
</script>

Put it in an absolutely-positioned div then use clientWidth to get the displayed width of the tag. You can even set the visibility to "hidden" to hide the div:

<div id="text" style="position:absolute;visibility:hidden" >This is some text</div>
<input type="button" onclick="getWidth()" value="Go" />
<script type="text/javascript" >
    function getWidth() {
        var width = document.getElementById("text").clientWidth;
        alert(" Width :"+  width);
    }
</script>

Maybe it will useful for some

const getMaxPixelsOfStrings = ({ strings, styles = {} }) => {
  const spans = strings.map(str => {
    const span = document.createElement('span')
    span.append(str)
    Object.assign(span.style, {
      position: 'absolute',
      ...styles,
    })

    return span
  })

  document.querySelector('html').prepend(...spans)
  const maxPixels = Math.max(...spans.map(span => span.getBoundingClientRect().width))

  spans.forEach(span => span.remove())

  return maxPixels
}

usage

getMaxPixelsOfStrings({
            strings: ['One', 'Two', 'Three', 'Four', 'Five'],
            styles: {
              fontSize: '18px',
              letterSpacing: '1px',
            },
          })