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

Use the Native JavaScript Methods: String.trimLeft(), String.trimRight(), and String.trim().

String.trim() is supported in IE9+ and all other major browsers:

'  Hello  '.trim()  //-> 'Hello'

String.trimLeft() and String.trimRight() are non-standard, but are supported in all major browsers except IE

'  Hello  '.trimLeft()   //-> 'Hello  '
'  Hello  '.trimRight()  //-> '  Hello'

IE support is easy with a polyfill however:

if (!''.trimLeft) {
    String.prototype.trimLeft = function() {
        return this.replace(/^\s+/,'');
    };
    String.prototype.trimRight = function() {
        return this.replace(/\s+$/,'');
    };
    if (!''.trim) {
        String.prototype.trim = function() {
            return this.replace(/^\s+|\s+$/g, '');
        };
    }
}

Answer 2

Here's a very simple way:

function removeSpaces(string){
return string.split(' ').join('');
}

Answer 3

Don't know what bugs can hide here, but I use this:

var some_string_with_extra_spaces="   goes here    "
console.log(some_string_with_extra_spaces.match(/\S.*\S|\S/)[0])

Or this, if text contain enters:

console.log(some_string_with_extra_spaces.match(/\S[\s\S]*\S|\S/)[0])

Another try:

console.log(some_string_with_extra_spaces.match(/^\s*(.*?)\s*$/)[1])

Answer 4

The trim from jQuery is convenient if you are already using that framework.

$.trim('  your string   ');

I tend to use jQuery often, so trimming strings with it is natural for me. But it's possible that there is backlash against jQuery out there? :)

Answer 5

Simple version here What is a general function for JavaScript trim?

function trim(str) {
        return str.replace(/^\s+|\s+$/g,"");
}

Answer 6

I know this question has been asked three years back.Now,String.trim() was added natively in JavaScript.For an instance, you can trim directly as following,

document.getElementById("id").value.trim();