CODEWITHSUNDEEP
javascriptdomsearchcase-insensitive
user2635299
user2635299

Reputation: 95

Case insensitive searching for a string in DOM

I am iterating over each text node, and looking for a search string whether it is available in that text node or not. If it's present I will wrap around the span node to do the highlighting. The sample code is available at this link: .http://jsfiddle.net/LcRDz/.

Right now if a user gives a word, it will search only that word. I need to search the DOM for the words irrespective of case. For example if my search word is the, it should highlight the words The, THE, the.

Upvotes: 1

Views: 232

Answers (3)

Prashant Thakkar
Prashant Thakkar

Reputation: 1403

Change your for loop in highlightWords method from

Original:

for (var i;
             (i = n.nodeValue.indexOf(word, i)) > -1; n = after)

New:

for (var i;
             (i = n.nodeValue.toLowerCase().indexOf(word.toLowerCase(), i)) > -1; n = after)

Upvotes: 1

ilpaijin
ilpaijin

Reputation: 3695

You should solve just by modifing 

for (var i;
    (i = n.nodeValue.indexOf(word, i)) > -1; n = after)

with

for (var i;
    (i = n.nodeValue.toLowerCase().indexOf(word.toLowerCase(), i)) > -1; n = after)

Upvotes: 1

Kevin Bowersox
Kevin Bowersox

Reputation: 94499

Before the check with indexOf use toLowercase on both values, making the comparison case insensitive.

 //Notice both n.nodeValue and word are sent to lowercase.
 for (var i;
        (i = n.nodeValue.toLowerCase().indexOf(word.toLowerCase(), i)) > -1; 
           n = after) {
             var after = n.splitText(i + word.length);
             var highlighted = n.splitText(i);
             var span = document.createElement('span');
             span.className = "spanClass";
             span.style.backgroundColor = "red";
             span.appendChild(highlighted);
             after.parentNode.insertBefore(span, after);
         }

JS FIDDLE: http://jsfiddle.net/LcRDz/2/

Upvotes: 1

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