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JavaScript: Ellipsis If Necessary

Ellipsis If Necessary (Javascript)

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);

Demo:

http://jsfiddle.net/cemerson/PFzpY/4/

Usage:

trimmedString = ellipsisIfNecessary(mystring,50);

Code

var test = "Four score and seven years ago our fathers brought forth on this continent, a new nation, conceived in Liberty, and dedicated to the proposition that all men are created equal. Now we are engaged in a great civil war, testing whether that nation, or any nation so conceived and so dedicated, can long endure. We are met on a great battle-field of that war. We have come to dedicate a portion of that field, as a final resting place for those who here gave their lives that that nation might live. It is altogether fitting and proper that we should do this.But, in a larger sense, we can not dedicate -- we can not consecrate -- we can not hallow -- this ground. The brave men, living and dead, who struggled here, have consecrated it, far above our poor power to add or detract. The world will little note, nor long remember what we say here, but it can never forget what they did here. It is for us the living, rather, to be dedicated here to the unfinished work which they who fought here have thus far so nobly advanced. It is rather for us to be here dedicated to the great task remaining before us -- that from these honored dead we take increased devotion to that cause for which they gave the last full measure of devotion -- that we here highly resolve that these dead shall not have died in vain -- that this nation, under God, shall have a new birth of freedom -- and that government of the people, by the people, for the people, shall not perish from the earth."

test = ellipsisIfNecessary(test,50);

function ellipsisIfNecessary(str,maxlen){
    // string isn't past max length 
    if(str.length < maxlen) return str;
    // string has no spaces - trimming w/out handling for around word spacing
    if(str.indexOf(' ',0) == -1) return str.substring(0,maxlen) + '...';
    
    // string has words/spaces - trimming intelligently so we dont cut a word in half
    var words = str.split(" ");
    var currentLength = 0;
    var trimmedString = "";
    var nextLength = 0;
    maxlen -= 4; // accounting for the " ..." we're going to add
    for(var w=0;w<words.length;w++){        
        var nextWord = words[w];
        if(w > 0){
            nextWord = ' ' + nextWord; // add space after first word
        }
        nextLength += nextWord.length;
        if(nextLength > maxlen){
            break;
        }else{
            trimmedString += nextWord;
            currentLength = nextLength;    
        }        
    }    
    return trimmedString + ' ...';
}
@vmariano

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vmariano commented Apr 10, 2014

I don't like this kind of solutions at least in a emergency. I always use css elipsis.
http://davidwalsh.name/css-ellipsis

@cemerson

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Owner Author

cemerson commented Apr 15, 2014

Yeah - this was mainly for multi-line scenarios. @vmariano

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