Does JavaScript have a built-in function like PHP's addslashes (or addcslashes) function to add backslashes to characters that need escaping in a string?
For example, this:
This is a demo string with 'single-quotes' and "double-quotes".
...would become:
This is a demo string with \'single-quotes\' and \"double-quotes\".
5 Answers
function addslashes( str ) {
return (str + '').replace(/[\\"']/g, '\\$&').replace(/\u0000/g, '\\0');
}
You can also try this for the double quotes:
JSON.stringify(sDemoString).slice(1, -1);
JSON.stringify('my string with "quotes"').slice(1, -1);
A variation of the function provided by Paolo Bergantino that works directly on String:
String.prototype.addSlashes = function()
{
//no need to do (str+'') anymore because 'this' can only be a string
return this.replace(/[\\"']/g, '\\$&').replace(/\u0000/g, '\\0');
}
By adding the code above in your library you will be able to do:
var test = "hello single ' double \" and slash \\ yippie";
alert(test.addSlashes());
EDIT:
Following suggestions in the comments, whoever is concerned about conflicts amongst JavaScript libraries can add the following code:
if(!String.prototype.addSlashes)
{
String.prototype.addSlashes = function()...
}
else
alert("Warning: String.addSlashes has already been declared elsewhere.");
Use encodeURI()
Escapes pretty much all problematic characters in strings for proper JSON encoding and transit for use in web applications. It's not a perfect validation solution but it catches the low-hanging fruit.
You can also use this
let str = "hello single ' double \" and slash \\ yippie";
let escapeStr = escape(str);
document.write("<b>str : </b>"+str);
document.write("<br/><b>escapeStr : </b>"+escapeStr);
document.write("<br/><b>unEscapeStr : </b> "+unescape(escapeStr));
