Created
May 1, 2016 20:28
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Angular2 text highlight pipe
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import {PipeTransform, Pipe} from 'angular2/core'; | |
@Pipe({ name: 'highlight' }) | |
export class HighLightPipe implements PipeTransform { | |
transform(text: string, [search]): string { | |
return search ? text.replace(new RegExp(search, 'i'), `<span class="highlight">${search}</span>`) : text; | |
} | |
} | |
/** Usage: | |
* <input type="text" [(ngModel)]="filter"> | |
* <div [innerHTML]="myAwesomeText | highlight : filter"></div> | |
* | |
*/ | |
In case someone is having problems with @ankitgrover 's code (Thank you!) :
import { Pipe, PipeTransform } from "@angular/core";
import { SafeHtml } from "@angular/platform-browser";
@Pipe({ name: "highlightText" })
export class HighlightPipe implements PipeTransform {
/* use this for single match search */
static SINGLE_MATCH: string = "Single-Match";
/* use this for single match search with a restriction that target should start with search string */
static SINGLE_AND_STARTS_WITH_MATCH: string = "Single-And-StartsWith-Match";
/* use this for global search */
static MULTI_MATCH: string = "Multi-Match";
constructor() {}
transform(
contentString: string = null,
stringToHighlight: string = null,
option: string = "Single-And-StartsWith-Match",
caseSensitive: boolean = false,
highlightStyleName: string = "search-highlight"
): SafeHtml {
if (stringToHighlight && contentString && option) {
let regex: any = "";
let caseFlag: string = !caseSensitive ? "i" : "";
switch (option) {
case "Single-Match": {
regex = new RegExp(stringToHighlight, caseFlag);
break;
}
case "Single-And-StartsWith-Match": {
regex = new RegExp("^" + stringToHighlight, caseFlag);
break;
}
case "Multi-Match": {
regex = new RegExp(stringToHighlight, "g" + caseFlag);
break;
}
default: {
// default will be a global case-insensitive match
regex = new RegExp(stringToHighlight, "gi");
}
}
const replaced = contentString.replace(
regex,
(match) => `<span class="${highlightStyleName}">${match}</span>`
);
return replaced;
} else {
return contentString;
}
}
}
Usage:
<div [innerHTML]="
string
| highlightText
: string
: 'string'
: boolean
: 'string'
"></div>
<td>
<div [innerHTML]="
row.content
| highlightText
: searchInputValue
: 'MULTI_MATCH'
: true
: 'your-class'
"></div>
</td>
@rafcontreras use this, so you can search for special characters too:
stringToHighlight = stringToHighlight.replace(/([-[\]{}()*+?.\\^$|#,])/g,'\\$1');
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This code is not quite correct. For example:
input - xaxa
users: [ 'xaxalololo', 'nonoxaxaxaxa', 'wtfxaxaxaxaxaxa' ]
Should works only to first occurrence, the code below is correct:
After that:
users: [ 'xaxalololo', 'nonoxaxaxaxa', 'wtfxaxaxaxaxaxa' ]