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
var functionName = function() {} vs function functionName() {}
The difference is that functionOne is a function expression and so only defined when that line is reached, whereas functionTwo is a function declaration and is defined as soon as its surrounding function or script is executed (due to hoisting).
For example, a function expression:
// TypeError: functionOne is not a function functionOne(); var functionOne = function() { console.log("Hello!"); };
Historically, function declarations defined within blocks were handled inconsistently between browsers. Strict mode (introduced in ES5) resolved this by scoping function declarations to their enclosing block.
'use strict'; { // note this block! function functionThree() { console.log("Hello!"); } } functionThree(); // ReferenceError
Ref: https://bit.ly/2zMAj1O
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