How can you check if an username or something like that contains no whitespaces? I have the code to replace al the whitespaces with any thing I want, but I prefer to notice the user they are using whitespaces and let them change it.


<input type="text" name="txtUsername" id="txtUsername" class="required" onblur="this.value = this.value.replace(/\s/gi, '_');" />



Thank you in advance!

Thijsje from the Netherlands!

Hi Furia

This function will check if the given username has any whitespace in it, or is empty. It uses the test function of the RegExp object, which returns true if the pattern exists in a given string.

function ContainsSpace(username)
{
    var re = /\s/i;
    return (username.length==0) || (re.test(username));
}

<input type="text" onblur="if(ContainsSpace(this.value))alert('invali d username')">

Hope this helps
Philip Cole