regexp: How to check if only spaces were entered in a form

Before sending a form, how can I check if only spaces were entered (ragardless of how many there are)? That way I can prevent the form from sending. Any other character is ok as long as it's not just all spaces.

 

im not sure of with regex but this function should work:

function isAllSpaces(strTxt) {
    for(i=0; i<strTxt.length; i++)
        if(strTxt.substr(i,1)!=" ") return false;
    return true;
}

Code (markup):

 

Hi,

You can test input like:

/^\s+$/.test(input_string)

Code (markup):

Regards

Edit: And this will test both for empty strings and spaces only strings

/^\s*$/.test(input_string)

Code (markup):