Pass parameter from view to controller via jquery in MVC 2

Question

I need to pass a url string from the view to the controller, a url that is retrieved via jquery. I tried just using the id parameter in the default routing, but that didn't work. It didn't accept a url string.

Calling the Controller through jquery works fine, like this:

$('#result').load('Home/Files/' + url);

This calls the correct action method, but unless I feed a simple text string it won't work (I tested feeding the url variable a simple string just to make sure the method was called at all).

So how can I get this url string to the controller? I am trying to think about how to do this the "MVC" way, and not break that way of thinking, so I don't want to utilize a hidden input with runat server. Could it be done with ViewData? I couldn't think of any way though, I only know how to set ViewData in the controller and fetch the value from the view, not the other way around...

I also tried adding a custom route (before the default route):

routes.MapRoute(
    "FileManager", // Route name
    "Home/{action}/{url}", // URL with parameters
    new { controller = "Home", action = "Files", url = "" } // Parameter defaults
);

But that didn't work either, same problem with not getting the url to the controller. I only did it because I had seen suggestions for it for people with similar problems here, but to be honest I don't see how this could work, because how is this any different from the default route? I have no idea why the {id} parameter only seems to accept certain strings (id format strings I suppose), but unless I could specify somehow what type the url parameter should be I don't see how adding this route should make any difference...

If someone could enlighten me I would be very grateful!

EDIT: When I think about it, since I'm getting the content through an ajax call with jquery, I'm not sure a ViewData type solution would work anyway, because the entire page isn't posted, or am I wrong? Keep in mind that I'm just learning MVC and jquery at the moment, so please don't assume I have all the basics clear to me yet :-). Basically I just want to be able to pass any type of string (and possibly other types of data that is not an id) to the controller from the view...

EDIT 2: I tried the suggested encodeURIComponent, but that didn't work either, unless I'm doing something wrong. Here's my code:

The url (doesn't matter if I try it as a relative path or an absolute one using file:///)

<li><a href="#" rel="visual studio 2010/Projects/JsTree/JsTree/">Some text</a>

The jquery:

var url;
$(document).ready(function () {
    $("a").click(function () {
        url = encodeURIComponent($(this).attr("rel"));
        $('#result').load('Home/Files/' + url);
    });
});

I'm calling an action method with a string id parameter. Note again that it works fine if I pass a simple string, and the call to the action is made. But if I use the url above, the action method is never even called... I have a breakpoint there that is never reached if there is a url in the parameter!

Answer 1

It's most likely that the URL is not being encoded properly - try using encodeURIComponent().

Another tip is to generate the URL of the action using MVC routing itself - URL.ForAction() IIRC - That way, if you ever change your routing information, all your JQuery will continue to work

Answer 2

Try encoding the URL before you pass it via encodeURICompoenent() like this:

$('#result').load('Home/Files/' + encodeURIComponent(url));

This encodes any complex strings for passing as the last parameter, if I'm understanding your issue correctly, this should help.