JavaScript: Escapes special characters for use in HTML
JavaScript String: Exercise-31 with Solution
Write a JavaScript function to escapes special characters (&, <, >, ', ") for use in HTML.
Test Data:
console.log(escape_html('PHP & MySQL'));
"PHP & MySQL"
console.log(escape_html('3 > 2'));
"3 > 2"
Sample Solution:-
HTML Code:
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>JavaScript function to escapes special characters for use in HTML.</title>
</head>
<body>
</body>
</html>
JavaScript Code:
function escape_html(str) {
if ((str===null) || (str===''))
return false;
else
str = str.toString();
var map = {
'&': '&',
'<': '<',
'>': '>',
'"': '"',
"'": '''
};
return str.replace(/[&<>"']/g, function(m) { return map[m]; });
}
console.log(escape_html('PHP & MySQL'));
console.log(escape_html('3 > 2'));
Sample Output:
PHP & MySQL 3 > 2
Flowchart:

Live Demo:
See the Pen JavaScript Escapes special characters for use in HTML - string-ex-31 by w3resource (@w3resource) on CodePen.
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JavaScript: Tips of the Day
Tagged template literals
function getPersonInfo(one, two, three) { console.log(one); console.log(two); console.log(three); } const person = 'Lydia'; const age = 21; getPersonInfo`${person} is ${age} years old`;
If you use tagged template literals, the value of the first argument is always an array of the string values. The remaining arguments get the values of the passed expressions!
Ref: https://bit.ly/323Y0P6
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