javascript - Highlight the search text - angular 2

Question

A messenger displays the search results based on the input given by the user. Need to highlight the word that is been searched, while displaying the result. These are the html and component that is been used.

Component.html

 <div *ngFor = "let result of resultArray">
<div>Id : result.id </div>
<div>Summary : result.summary </div>
<div> Link : result.link </div>
</div>

Component.ts

resultArray : any = [{"id":"1","summary":"These are the results for the searched text","link":"http://www.example.com"}]

This resultArray is fetched from hitting the backend service by sending the search text as input. Based on the search text, the result is fetched. Need to highlight the searched text, similar to google search. Please find the screenshot,

If I search for the word "member", the occurence of the word "member" gets highlighted. How to achieve the same using angular 2. Please suggest an idea on this.

Answer 1

You can do that by creating a pipe and applying that pipe to the summary part of array inside ngfor. Here is the code for Pipe:

import { Pipe, PipeTransform } from '@angular/core';

@Pipe({
    name: 'highlight'
})

export class HighlightSearch implements PipeTransform {

    transform(value: any, args: any): any {
        if (!args) {return value;}
        var re = new RegExp(args, 'gi'); //'gi' for case insensitive and can use 'g' if you want the search to be case sensitive.
        return value.replace(re, "<mark>$&</mark>");
    }
}

and then in markup apply it on a string like this:

<div innerHTML="{{ str | highlight : 'search'}}"></div>

Replace 'search' with the word you want to highlight.

Hope this will help.