Trim string in JavaScript?

Question

How do I trim a string in JavaScript? That is, how do I remove all whitespace from the beginning and the end of the string in JavaScript?

Answer 1

All browsers since IE9+ have trim() method for strings:

" \n test \n ".trim(); // returns "test" here 

For those browsers who does not support trim(), you can use this polyfill from MDN:

if (!String.prototype.trim) {     (function() {         // Make sure we trim BOM and NBSP         var rtrim = /^[\s\uFEFF\xA0]+|[\s\uFEFF\xA0]+$/g;         String.prototype.trim = function() {             return this.replace(rtrim, '');         };     })(); } 

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That said, if using jQuery, $.trim(str) is also available and handles undefined/null.

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See this:

String.prototype.trim=function(){return this.replace(/^\s+|\s+$/g, '');};  String.prototype.ltrim=function(){return this.replace(/^\s+/,'');};  String.prototype.rtrim=function(){return this.replace(/\s+$/,'');};  String.prototype.fulltrim=function(){return this.replace(/(?:(?:^|\n)\s+|\s+(?:$|\n))/g,'').replace(/\s+/g,' ');};