Add URL parameter value to input box

Question

I have jQuery script that takes a URL parameter and adds the value to an input box.

When the URL is the form of www.mysite.com/page/?number=10 everything works fine. When the url includes .php at the end of the page than the script doesn't work, e.g. www.mysite.com/page.php?number=10.

I need for the script to work with .php is used.

Here is the script:

  jQuery(document).ready(function() {
    (function($) {
        jQuery.QueryString = (function(a) {
            if (a == "") return {};
            var b = {};
            for (var i = 0; i < a.length; ++i)
            {
                var p=a[i].split('=');
                if (p.length != 2) continue;
                b[p[0]] = decodeURIComponent(p[1].replace(/+/g, " "));
            }
            return b;
        })(window.location.search.substr(1).split('&'))
    })(jQuery);

    jQuery.QueryString["number"];

    jQuery("#entry_2081224724").val(jQuery.QueryString["number"]);

  });

What do you mean "doesn't work"? Have you debugged to see where the issue is? — Jason P
– Jason P, Commented Oct 9, 2013 at 20:36
It doesn't work as in the parameter value does not get added to the input field. In Chrome, I receive this error "Uncaught SyntaxError: Invalid regular expression: /+/: Nothing to repeat" but I don't know how to fix the expression. — user715564
– user715564, Commented Oct 9, 2013 at 20:40
Your regular expression is currently containing a quantifier + that means "1 or more" of the expression preceding it. But you mean the + literally, so you should escape it like so \+. — Boaz
– Boaz, Commented Oct 9, 2013 at 20:43

musicnothing · Accepted Answer · 2013-10-09 20:43:02Z

1

Read this:

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Regular_Expressions

Your issue is, the regular expression character + gives an instruction to repeat the character that precedes it one or more times. The syntax error your getting is telling you that you haven't given it a character to repeat.

Are you trying to replace all + characters? If so, you're going to need to escape it with \.

Are you trying to say "one or more / characters"? Again, you'll need to escape that too, because / denotes the beginning of a regular expression.

answered Oct 9, 2013 at 20:43

musicnothing

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2 Comments

Boaz Over a year ago

I believe the OP is looking to replace the plus signs in the URL with spaces. So it should probably be /\+/.

user715564 Over a year ago

Yes, this is correct. Thanks for the help and the link to read up on regular expressions. That's definitely an area I don't experience in. Thanks again.

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