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Insert ellipsis (…) into HTML tag if content too wide

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名媛妹妹
名媛妹妹 2020-11-22 10:07

I have a webpage with an elastic layout that changes its width if the browser window is resized.

In this layout there are headlines (h2) that will have

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  • 青春惊慌失措
    2020-11-22 11:08

    Here's another JavaScript solution. Works very good and very fast.

    https://github.com/dobiatowski/jQuery.FastEllipsis

    Tested on Chrome, FF, IE on Windows and Mac.

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  • 春和景丽
    2020-11-22 11:08

    This is similar to Alex's but does it in log time instead of linear, and takes a maxHeight parameter.

    jQuery.fn.ellipsis = function(text, maxHeight) {
  var element = $(this);
  var characters = text.length;
  var step = text.length / 2;
  var newText = text;
  while (step > 0) {
    element.html(newText);
    if (element.outerHeight() <= maxHeight) {
      if (text.length == newText.length) {
        step = 0;
      } else {
        characters += step;
        newText = text.substring(0, characters);
      }
    } else {
      characters -= step;
      newText = newText.substring(0, characters);
    }
    step = parseInt(step / 2);
  }
  if (text.length > newText.length) {
    element.html(newText + "...");
    while (element.outerHeight() > maxHeight && newText.length >= 1) {
      newText = newText.substring(0, newText.length - 1);
      element.html(newText + "...");
    }
  }
};
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  • 执念已碎
    2020-11-22 11:08

    I couldn't find a script that worked exactly as I wanted it so did my own for jQuery - quite a few options to set with more on their way :)

    https://github.com/rmorse/AutoEllipsis

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  • 日久生厌
    2020-11-22 11:08

    Here is a nice widget/plugin library which has ellipsis built in: http://www.codeitbetter.co.uk/widgets/ellipsis/ All you need to do it reference the library and call the following: 

    <script type="text/javascript"> 
   $(document).ready(function () { 
      $(".ellipsis_10").Ellipsis({ 
         numberOfCharacters: 10, 
         showLessText: "less", 
         showMoreText: "more" 
      }); 
   }); 
</script> 
<div class="ellipsis_10"> 
   Some text here that's longer than 10 characters. 
</div>
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  • 终归单人心
    2020-11-22 11:08 
    <html>
<head>
    <!-- By Warren E. Downs, copyright 2016.  Based loosely on a single/multiline JQuery using example by Alex,
    but optimized to avoid JQuery, to use binary search, to use CSS text-overflow: ellipsis for end,
    and adding marquee option as well.
    Credit: Marquee: http://jsfiddle.net/jonathansampson/xxuxd/
            JQuery version: http://stackoverflow.com/questions/536814/insert-ellipsis-into-html-tag-if-content-too-wide
            (by Alex, http://stackoverflow.com/users/71953/alex)
            (Improved with Binary Search as suggested by StanleyH, http://stackoverflow.com/users/475848/stanleyh)
    -->
    <meta content="text/html;charset=utf-8" http-equiv="Content-Type">
    <meta content="utf-8" http-equiv="encoding">
    <style>

        .single {
            overflow:hidden;
            white-space: nowrap;
            width: 10em;
            padding: 10px;
            margin: 0 auto;
            border: solid 1px blue;
        }

        .multiline {
            overflow: hidden;
            white-space: wrap;
            width: 10em;
            height: 4.5em;
            padding: 10px;
            margin: 0 auto;
            border: solid 1px blue;
        }

        .marquee {
            overflow: hidden;
            width: 40em;
            padding: 10px;
            margin: 0 auto;
            border: solid 1px blue;
        }

</style>
    <script>
        var _marqueeNumber=0;
        // mode=start,end,middle
        function clipText(text, len, mode) {
            if(!mode) { mode="end"; }
            else { mode=mode.toLowerCase(); }
            if(mode == "start") { return "&hellip;"+clipText(text,len,"_start"); }
            if(mode == "_start") { return text.substr(text.length - len); }
            if(mode == "middle") { 
                return clipText(text, len/2, "end") + clipText(text, len/2, "_start");
            }
            return text.substr(0, len) + "&hellip;";
        }

        function generateKeyframes(clsName, start, end) {
            var sec=5;
            var totalLen=parseFloat(start)-parseFloat(end);
            if(start.indexOf('em') > -1)      { sec=Math.round(totalLen/3); }
            else if(start.indexOf('px') > -1) { sec=Math.round(totalLen/42); }

            var style = document.createElement('style');
            style.type = 'text/css';
            style.innerHTML = 'body {}';
            document.getElementsByTagName('head')[0].appendChild(style);
            this.stylesheet = document.styleSheets[document.styleSheets.length-1];
            try {
                this.stylesheet.insertRule('.'+clsName+' {\n'+
                    '    animation: '+clsName+' '+sec+'s linear infinite;\n'+
                    '}\n', this.stylesheet.rules.length);
                this.stylesheet.insertRule('.'+clsName+':hover {\n'+
                    '    animation-play-state: paused\n'+
                    '}\n', this.stylesheet.rules.length);
                this.stylesheet.insertRule('@keyframes '+clsName+' {\n'+
                    '    0%   { text-indent: '+start+' }\n'+
                    '    100% { text-indent: '+end+' }\n'+
                    '}', this.stylesheet.rules.length);
            } catch (e) {
                console.log(e.message);
            }
        }

        function addClone(el, multiline, estyle) {
            if(!estyle) { 
                try { estyle=window.getComputedStyle(el); }
                catch(e) { return null; }
            }
            var t = el.cloneNode(true);
            var s=t.style;
            //s.display='none';
            s.visibility='hidden'; // WARNING: Infinite loop if this is not hidden (e.g. while testing)
            s.display='inline-block';
            s.background='black';
            s.color='white';
            s.position='absolute';
            s.left=0;
            s.top=0;
            s.overflow='visible';
            s.width=(multiline ? parseFloat(estyle.width) : 'auto');
            s.height=(multiline ? 'auto' : parseFloat(estyle.height));

            el.parentNode.insertBefore(t, el.nextSibling);

            return t;
        }
        function getTextWidth(el, multiline) {
            var t=addClone(el, multiline);
            if(!t) { return null; }
            var ts=window.getComputedStyle(t);
            var w=ts.width;
            if(multiline) {
                var es=window.getComputedStyle(el);
                var lines=Math.round(parseInt(ts.height)/parseInt(es.height))*2+0.5;
                w=w+'';
                var unit=''; // Extract unit
                for(var xa=0; xa<w.length; xa++) {
                    var c=w[xa];
                    if(c <= '0' || c >= '9') { unit=w.substr(xa-1); }
                }
                w=parseFloat(w);
                w*=lines; // Multiply by lines
                w+=unit; // Append unit again
            }
            t.parentNode.removeChild(t);
            return w;
        }

        // cls=class of element to ellipsize
        // mode=start,end,middle,marq (scrolling marquee instead of clip)
        function ellipsis(cls, mode) {
            mode=mode.toLowerCase();
            var elems=document.getElementsByClassName(cls);
            for(xa in elems) {
                var el=elems[xa];
                var multiline = el.className ? el.className.indexOf('multiline') > -1 : true;
                if(mode == "marq") {       
                    var w=getTextWidth(el, multiline);
                    if(!w) { continue; }
                    var mCls="dsmarquee"+(_marqueeNumber++);
                    var es=window.getComputedStyle(el);
                    generateKeyframes(mCls,es.width, '-'+w);
                    el.className+=" "+mCls; 
                    continue; 
                }
                if(mode == "end" && !multiline) { el.style.textOverflow="ellipsis"; continue; }
                var estyle=null;
                try { estyle=window.getComputedStyle(el); }
                catch(e) { continue; }
                if(estyle.overflow == "hidden") {
                    var text = el.innerHTML;
                    var t=addClone(el, multiline, estyle);

                    function height() {
                        var ts=window.getComputedStyle(t);
                        var es=window.getComputedStyle(el);
                        return parseFloat(ts.height) - parseFloat(es.height); 
                    }
                    function width() { 
                        var ts=window.getComputedStyle(t);
                        var es=window.getComputedStyle(el);
                        return parseFloat(ts.width) - parseFloat(es.width); 
                    }

                    var tooLong = multiline ? height : width;

                    var len=text.length;
                    var diff=1;
                    var olen=0;
                    var jump=len/2;
                    while (len > 0) {
                        var diff=tooLong();
                        if(diff > 0) { len-=jump; jump/=2; }
                        else if(diff < 0) { len+=jump; }
                        len=Math.round(len);
                        //alert('len='+len+';olen='+olen+';diff='+diff+';jump='+jump+';t='+JSON.stringify(t.innerHTML));
                        t.innerHTML=clipText(text, len, mode);
                        if(olen == len) { break; }
                        olen=len;
                    }
                    el.innerHTML=t.innerHTML;
                    t.parentNode.removeChild(t);
                }           
                //break;
                t.style.visibility='hidden';
            }
        }

        function testHarness() {
            ellipsis('ellipsis1', 'start'); 
            ellipsis('ellipsis2', 'end'); 
            ellipsis('ellipsis3', 'middle'); 
            ellipsis('marquee', 'marq')
        }
    </script>
    </head>
    <body onload="testHarness()">
    <div class="single ellipsis1" style="float:left">some long text that should be clipped left</div>
    <div class="single ellipsis2" style="float:right">right clip long text that should be clipped</div>
    <div class="single ellipsis3" style="float:center">some long text that should be clipped in the middle</div>

    <br />

    <p class="single marquee">Windows 8 and Windows RT are focused on your life—your friends and family, your apps, and your stuff. With new things like the <a href="http://windows.microsoft.com/en-US/windows-8/start-screen">Start screen</a>, <a href="http://windows.microsoft.com/en-US/windows-8/charms">charms</a>, and a <a href="http://windows.microsoft.com/en-US/windows-8/microsoft-account">Microsoft account</a>, you can spend less time searching and more time doing.</p>
    &nbsp;

    <br />

    <div class="multiline ellipsis1" style="float:left">Test test test test test test, some more long text, such as asdasdasdasdasd, that should be multiline clipped left(*)</div>

    <div class="multiline ellipsis2" style="float:right">right clip multiline long text, such as Test test test test test test, and some more long text that should be multiline clipped right.</div>

    <div class="multiline ellipsis3" style="float:center">Test test test test test test, some more long text, such as asdasdasdasdasd, that should be multiline clipped in the middle(*)</div>

    <br />

    <p class="multiline marquee">Multiline Marquee: Windows 8 and Windows RT are focused on your life—your friends and family, your apps, and your stuff. With new things like the <a href="http://windows.microsoft.com/en-US/windows-8/start-screen">Start screen</a>, <a href="http://windows.microsoft.com/en-US/windows-8/charms">charms</a>, and a <a href="http://windows.microsoft.com/en-US/windows-8/microsoft-account">Microsoft account</a>, you can spend less time searching and more time doing.</p>
    &nbsp;

    </body>
</html>
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  • 陌清茗
    2020-11-22 11:10

    Just like @acSlater I couldn't find something for what I needed so I rolled my own. Sharing in case anyone else can use:

    Method: 
    ellipsisIfNecessary(mystring,maxlength);
    Usage: 
    trimmedString = ellipsisIfNecessary(mystring,50);
    Code and Demo Link: https://gist.github.com/cemerson/10368014
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