Validating textbox entry through javascript

Question

I wanted to allow only characters in a textbox and space in between two characters.I am trying to avoid any unwanted characters and blank string in following Javascript code.

var filter = "^[a-zA-Z''-'\s]{1,40}$";
        var label = $('#<%= txtName.ClientID %>').val();

        if ((label.length > 0) && (label!= '')) {
            if (label.match(/^[a-zA-Z \s]{1,40}$/)) {
                if (label.match(/^\s$/)) {
                    alert("Please Enter a Valid name");
                    return false;
                }
                else {

                    $("#myModal").dialog('open');
                }
            }
            else {
                alert("Please Enter a Valid name");
            }
        }
        else {
            alert("Please Enter a Valid name");
        }

This is working fine for everything except when user enters more than 1 space in the textbox. I was thinking that label.match(/^\s$/)) will take care of blank string or blank spaces.

Thanks

Why don't you use an ASP .NET Regular Expression Validator or a custom validator ? That way, you get both client AND server side validation. Users can easily circumvent the JavaScript validation. — Jude Cooray
– Jude Cooray, Commented Jul 14, 2011 at 10:27

cwallenpoole · Accepted Answer · 2011-07-14 10:29:41Z

1

It looks like this is a job for 0 or more (the RegEx *)! (Pardon the exclamation, I'm feeling epic this morning)

/^\s$/ means "contains only one space"

I believe you are looking for

/^\s*$/ means "contains only zero or more spaces"

answered Jul 14, 2011 at 10:29

cwallenpoole

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Ankur · Accepted Answer · 2011-07-14 10:26:39Z

0

you should use + sign in regular expression for more than one entities.suppose if you want multiple spaces then use like var expr=/(\s)+/

answered Jul 14, 2011 at 10:26

Ankur

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