How to access javascript variable within @URL.Action()

Question

How can I access JavaScript value inside @URL.Action()? something like:

<script type="text/javascript">
function name(myjavascriptID)
{
     jQuery("#list_d").jqGrid('setGridParam', { url: '@URL.Action("download file", "download", new { id = <myjavascriptID> })', page: 1 });

}
</script>

Solution 1

You can't. JavaScript doesn't execute when generating the action URL. What you can do, is do something like this:

function name(myjavascriptID)    {
     var link = '@Url.Action("download file", "download", new { id = "-1" })';
     link = link.replace("-1", myjavascriptID);

     jQuery("#list_d").jqGrid('setGridParam', { url: link, page: 1 });
}

Solution 2

I do something fairly similar, but less verbose:

var myUrl = '@Url.Action("Solution","Partner")/' + myjavascriptID;
$.ajax.load(myUrl); // or whatever

We can do this because of routing, and ultimately Url.Action with route dictionary parameters translates into a URI that looks like:

http://localhost:41215/Partner/Solution?myJavascriptID=7

Just a second choice, because as a wise old man once said "It is our choices, Harry, that show what we truly are, far more than our abilities."

Solution 3

You can pass in the variables to any link as shown below...

var url = '@Html.Raw(@Url.Action("MethodName", "ControllerName"))' + '?id = ' + myjavascriptID

Solution 4

In the same vein as Brian Mains's answer, you could format your url string instead of replacing -1 with your variable, that is if like me, you judge it is better to read. The following answer assumes that you've modified String's prototype as suggested in this answer:

var url = unescape('@Url.Action("download file", "download", new { id = "{0}" })').format(myjavascriptID);

The unescape call is necessary if you want to decode your {0}. I like this alternative, because it makes it easier to have multiple parameters from JS variables. For instance:

var url = unescape('@Html.Raw(Url.Action("Action", "Controller", new { id = "{0}", name = "{1}" }))').format(myID, myName);

I added Html.Raw in my second example in order to avoid having &amp in the url string.

Solution 5

You can replace url like code below

var jsUrl = '@Url.Action("action", "controller")'; // ## is the token
var getUrl = jsUrl.replace('action', action).replace('controller', controller)  
$("#RenderPartial").load(getUrl); 

View more solutions

Comments

[Bolu]

Thank you for your answer, it works with one small modification: instead of link.href I need to use link . Thanks very much!

[Nic]

What if id will be string like "Hello world" ?

[Brian Mains]

The idea is for the -1 to be something uniquely identifiable in the string, for you to replace with whatever you want. You would need to make sure Hello World is encoded, like Hello+World. But yes, replace it with whatever you want

[juFo]

is there no cleaner solution?

[Kate]

It will break RoutAttribute configuration :(((

[alcohol is evil]

Great answer. Now I don't have to worry about changes in routing configuration. I use "{id}" string instead of "-1", so it looks more natural to me and I don't have to worry about using -1 value for any other variable in the future, but unfortunately in replace function it has to be converted by Url.Encode and also there's a difference in letters case in those strings.

[Shaiju T]

remove capital URL prefixed before @URL.Action to @Url.Action as it shows compile time error

[David Létourneau]

Add your answer with this one and got the perfect answer: stackoverflow.com/a/36981170/453142

[Grenville]

Hadn't thought of this. It's a good shout as I would never have -1 as a valid Id, yet it's a valid int for my route. Only issue is if there 'is' a valid -1 elsewhere in the route. Still, best solution I've yet seen.

[Mr Nellinger]

Good to note you can do this as many times as you want for multiple params. Just use -2, -3 and so on. This trick really helped me out at work today. Thanks.