w3resource

JavaScript: Escape a HTML string

JavaScript String: Exercise-19 with Solution

Write a JavaScript function to escape a HTML string.

Test Data:
console.log(escape_HTML('<a href="javascript-string-exercise-17.php" target="_blank">'));
Output: 

<a href="javascript-string-exercise-17.php" target="_blank">

Sample Solution:-

HTML Code:

<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <title>Write a JavaScript function to escape a HTML string.</title>
</head>
<body>

</body>
</html>

JavaScript Code:

function escape_HTML(html_str) {
    'use strict';

    return html_str.replace(/[&<>"]/g, function (tag) {
		var chars_to_replace = {
            '&': '&',
            '<': '<',
            '>': '>',
            '"': '"'
        };

		return chars_to_replace[tag] || tag;
	});
}

console.log(escape_HTML('&lt;a href=&quot;javascript-string-exercise-17.php&quot; target=&quot;_blank&quot;&gt;'));

Sample Output:

<a href="javascript-string-exercise-17.php" target="_blank">

Flowchart:

Flowchart: JavaScript- Escape a HTML string

Live Demo:

See the Pen JavaScript Escape a HTML string - string-ex-19 by w3resource (@w3resource) on CodePen.


Improve this sample solution and post your code through Disqus

Previous: Write a JavaScript function to count the occurrence of a substring in a string.
Next: Write a JavaScript function that can pad (left, right) a string to get to a determined length.

What is the difficulty level of this exercise?

Test your Programming skills with w3resource's quiz.



JavaScript: Tips of the Day

Returns true if the given number is a power of 2, false otherwise

Example:

const tips_isPowerOfTwo = n => !!n && (n & (n - 1)) == 0;
console.log(tips_isPowerOfTwo(0)); 
console.log(tips_isPowerOfTwo(4));
console.log(tips_isPowerOfTwo(16));

Output:

false
true
true