Javascript: highlight substring keeping original case but searching in case insensitive mode

user_257092 0
Viewed 27567

I'm trying to write a "suggestion search box" and I cannot find a solution that allows to highlight a substring with javascript keeping the original case.

For example if I search for "ca" I search server side in a case insensitive mode and I have the following results:

Calculator

calendar

ESCAPE

I would like to view the search string in all the previous words, so the result should be:

Calculator

calendar

ESCAPE

I tried with the following code:

var reg = new RegExp(querystr, 'gi');
var final_str = 'foo ' + result.replace(reg, '<b>'+querystr+'</b>');
$('#'+id).html(final_str);

But obviously in this way I loose the original case!

Is there a way to solve this problem?

case-insensitive case-sensitive javascript regex
9 Answers

string.replace fails in the general case. If you use .innerHTML, replace can replace matches in tags (like a tags). If you use .innerText or .textContent, it will remove any tags there were previously in the html. More than that, in both cases it damages your html if you want to remove the highlighting.

The true answer is mark.js (https://markjs.io/). I just found this - it is what I have been searching for for such a long time. It does just what you want it to.

user_12914920

Highlight search term and anchoring to first occurence - Start

function highlightSearchText(searchText) {
    var innerHTML = document.documentElement.innerHTML;
    var replaceString = '<mark>'+searchText+'</mark>';
    var newInnerHtml = this.replaceAll(innerHTML, searchText, replaceString);
    document.documentElement.innerHTML = newInnerHtml;
    var elmnt = document.documentElement.getElementsByTagName('mark')[0]
    elmnt.scrollIntoView();
}

function replaceAll(str, querystr, replace) {
    var reg = new RegExp(querystr, 'gi');
    var final_str = str.replace(reg, function(str) {return '<mark>'+str+'</mark>'});
    return final_str
}

Highlight search term and anchoring to first occurence - End

user_37153160
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