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How to replace matching words within a page replacing the body.innerHTML only once?

January 17, 2022

The following function in JavaScript adds to each matching word a <mark> tag in the document’s body.

var words = ["apple", "banana", "carrot", "pear"];  

for (var i=0; i < words.length; i++) {
  var replace = new RegExp(words[i],"g");
  var page = document.body.innerHTML;
  var newPage = page.replace(replace, `<mark>${words[i]}</mark>`);
  document.body.innerHTML = newPage;
}

This way, it highlights a word within the <body> if it’s an element within the array words.

The issue I have is that the document.body.innerHTML is replaced at every iteration. Do you know how I can replace the matching words in the page limiting the numbers of document.body.innerHTML = newPage to 1?

Thanks in advance for your replies!

>Solution :

Get innerHTML before loop and set innerHTML after loo. you can use replaceAll to change all matching word

var words = ["apple", "banana", "carrot", "pear"];
var page = document.body.innerHTML;

words.forEach((word)  => {
  page = page.replaceAll(word, `<mark>${word}</mark>`);
});

document.body.innerHTML = page;