How to Trim String in JavaScript ?

JavaScript trim() function is used for removing spaces before and after a string. Following example will help you to remove trailing and preceding white space using JavaScript . If you are searching for fixing issue with trim() function in old browsers, check below Example 2.

Example 1:

For example if a variable have string with trailing and preceding white space. We can use JavaScript trim() method to remove these space easily.

str="      Welcome to TecAdmin.net!     ";
trimStr = str.trim();
alert(str.trim());

Example 2:

Some of older browser may not support JavaScript trim() function. In that case we can use replace method to remove trailing and preceding white spaces from any string.

Trim Space Both Side:

alltrimStr = str.replace(/^s+|s+$/gm,'');

Trim Spaces Left Side:

ltrimStr = str.replace(/^s+/,'');

Trim Spaces Right Side:

rtrimStr = str.replace(/s+$/,'');