Going off of @uri's answer in this thread, I modified it to work with a single string OR a string array.
Here's the TypeScript version
module myApp.Filters.Highlight {
"use strict";
class HighlightFilter {
//This will wrap matching search terms with an element to visually highlight strings
//Usage: {{fullString | highlight:'partial string'}}
//Usage: {{fullString | highlight:['partial', 'string, 'example']}}
static $inject = ["$sce"];
constructor($sce: angular.ISCEService) {
// The `terms` could be a string, or an array of strings, so we have to use the `any` type here
/* tslint:disable: no-any */
return (str: string, terms: any) => {
/* tslint:enable */
if (terms) {
let allTermsRegexStr: string;
if (typeof terms === "string") {
allTermsRegexStr = terms;
} else { //assume a string array
// Sort array by length then join with regex pipe separator
allTermsRegexStr = terms.sort((a: string, b: string) => b.length - a.length).join('|');
}
//Escape characters that have meaning in regular expressions
//via: http://stackoverflow.com/a/6969486/79677
allTermsRegexStr = allTermsRegexStr.replace(/[\-\[\]\/\{\}\(\)\*\+\?\.\\\^\$\|]/g, "\\$&");
// Regex to simultaneously replace terms - case insensitive!
var regex = new RegExp('(' + allTermsRegexStr + ')', 'ig');
return $sce.trustAsHtml(str.replace(regex, '<mark class="highlight">$&</mark>'));
} else {
return str;
}
};
}
}
angular
.module("myApp")
.filter("highlight", HighlightFilter);
};
Which translates to this in JavaScript:
var myApp;
(function (myApp) {
var Filters;
(function (Filters) {
var Highlight;
(function (Highlight) {
"use strict";
var HighlightFilter = (function () {
function HighlightFilter($sce) {
// The `terms` could be a string, or an array of strings, so we have to use the `any` type here
/* tslint:disable: no-any */
return function (str, terms) {
/* tslint:enable */
if (terms) {
var allTermsRegexStr;
if (typeof terms === "string") {
allTermsRegexStr = terms;
}
else {
// Sort array by length then join with regex pipe separator
allTermsRegexStr = terms.sort(function (a, b) { return b.length - a.length; }).join('|');
}
//Escape characters that have meaning in regular expressions
//via: http://stackoverflow.com/a/6969486/79677
allTermsRegexStr = allTermsRegexStr.replace(/[\-\[\]\/\{\}\(\)\*\+\?\.\\\^\$\|]/g, "\\$&");
// Regex to simultaneously replace terms - case insensitive!
var regex = new RegExp('(' + allTermsRegexStr + ')', 'ig');
return $sce.trustAsHtml(str.replace(regex, '<mark class="highlight">$&</mark>'));
}
else {
return str;
}
};
}
//This will wrap matching search terms with an element to visually highlight strings
//Usage: {{fullString | highlight:'partial string'}}
//Usage: {{fullString | highlight:['partial', 'string, 'example']}}
HighlightFilter.$inject = ["$sce"];
return HighlightFilter;
})();
angular.module("myApp").filter("highlight", HighlightFilter);
})(Highlight = Filters.Highlight || (Filters.Highlight = {}));
})(Filters = myApp.Filters || (myApp.Filters = {}));
})(myApp|| (myApp= {}));
;
Or if you just want a simple JavaScript implementation without those generated namespaces:
app.filter('highlight', ['$sce', function($sce) {
return function (str, terms) {
if (terms) {
var allTermsRegexStr;
if (typeof terms === "string") {
allTermsRegexStr = terms;
}
else {
// Sort array by length then join with regex pipe separator
allTermsRegexStr = terms.sort(function (a, b) { return b.length - a.length; }).join('|');
}
//Escape characters that have meaning in regular expressions
//via: http://stackoverflow.com/a/6969486/79677
allTermsRegexStr = allTermsRegexStr.replace(/[\-\[\]\/\{\}\(\)\*\+\?\.\\\^\$\|]/g, "\\$&");
// Regex to simultaneously replace terms - case insensitive!
var regex = new RegExp('(' + allTermsRegexStr + ')', 'ig');
return $sce.trustAsHtml(str.replace(regex, '<mark class="highlight">$&</mark>'));
}
else {
return str;
}
};
}]);
EDITED to include a fix that would have previously broken this is someone searched for . or any other character that had meaning in a regular expression. Now those characters get escaped first.
