JS-Question/wordHighlighter.html at master · vishal-vaish/JS-Question · GitHub

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<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>

<body>
    <label for="paragraph-input">Enter paragraph here</label>
    <div id="paragraph-input" contenteditable="true">Enter text here</div>
    <br />
    <br />
    <div>Total matches:- <span id="words-counter">0</span></div>
    <br />
    <label for="word-input">Enter word to be higlighted here</label>
    <input oninput="onchangehandler()" type="text" id="word-input">
    <br />
    <br />
    <label for="ignore-case">Ignore case?</label>
    <input type="checkbox" id="ignore-case" onchange="onchangehandler()">
</body>

</html>
<style>
    #paragraph-input {
        border: 2px solid rgb(150, 0, 0);
        width: 400px;
        height: 300px;
        padding: 8px 16px;
        overflow: scroll;
    }

    .highlighted-txt {
        color: rgb(0, 0, 0);
        background-color: rgb(241, 255, 45);
    }
</style>
<script>

    function onchangehandler() {
        let input = document.getElementById("word-input").value;
        let paragraph = document.getElementById("paragraph-input");
        let checkcase = document.getElementById("ignore-case").checked;
        console.log(checkcase);
        let count = 0;
        if (!input) return;


        let result = "";
        if (checkcase) {
            let resultcase=new RegExp(input,'ig')
            result = paragraph.innerText.replaceAll(resultcase, (event) => {

            count++;
            return `<span class="highlighted-txt">${event}</span>`;
            });
        } else {

            result = paragraph.innerText.replaceAll(input, (event) => {
                count++;
                return `<span class="highlighted-txt">${event}</span>`;
            })
        }
        document.getElementById("words-counter").innerText = count;
        paragraph.innerHTML = result;

    }


</script>