String strip() for JavaScript?
JavascriptTrimStripJavascript Problem Overview
What's a clean and efficient JavaScript implementation to strip leading and trailing spaces from a string?
For example:
" dog"
"dog "
" dog "
" dog "
all get turned into
"dog"
Javascript Solutions
Solution 1 - Javascript
Use this:
if(typeof(String.prototype.trim) === "undefined")
{
String.prototype.trim = function()
{
return String(this).replace(/^\s+|\s+$/g, '');
};
}
The trim function will now be available as a first-class function on your strings. For example:
" dog".trim() === "dog" //true
EDIT: Took J-P's suggestion to combine the regex patterns into one. Also added the global modifier per Christoph's suggestion.
Took Matthew Crumley's idea about sniffing on the trim function prior to recreating it. This is done in case the version of JavaScript used on the client is more recent and therefore has its own, native trim function.
Solution 2 - Javascript
For jquery users, how about $.trim(s)
Solution 3 - Javascript
Gumbo already noted this in a comment, but this bears repeating as an answer: the trim() method was added in JavaScript 1.8.1 and is supported by all modern browsers (Firefox 3.5+, IE 9, Chrome 10, Safari 5.x), although IE 8 and older do not support it. Usage is simple:
" foo\n\t ".trim() => "foo"
See also:
Solution 4 - Javascript
Here's the function I use.
function trim(s){
return ( s || '' ).replace( /^\s+|\s+$/g, '' );
}
Solution 5 - Javascript
A better polyfill from the MDN that supports removal of BOM and NBSP:
if (!String.prototype.trim) {
String.prototype.trim = function () {
return this.replace(/^[\s\uFEFF\xA0]+|[\s\uFEFF\xA0]+$/g, '');
};
}
Bear in mind that modifying built-in prototypes comes with a performance hit (due to the JS engine bailing on a number of runtime optimizations), and in performance critical situations you may need to consider the alternative of defining myTrimFunction(string) instead. That being said, if you are targeting an older environment without native .trim() support, you are likely to have more important performance issues to deal with.
Solution 6 - Javascript
Steven Levithan once wrote about how to implement a Faster JavaScript Trim. It’s definitely worth a look.
Solution 7 - Javascript
If you're already using jQuery, then you may want to have a look at jQuery.trim() which is already provided with jQuery.
Solution 8 - Javascript
If, rather than writing new code to trim a string, you're looking at existing code that calls "strip()" and wondering why it isn't working, you might want to check whether it attempts to include something like the prototypejs framework, and make sure it's actually getting loaded.
That framework adds a strip function to all String objects, but if e.g. you upgraded it and your web pages are still referring to the old .js file it'll of course not work.