I have an instance where I am trying to pass a dynamic number of Page Parameters into an action method. It works... but it only will pass as a String. Is there a way to pass correclty as a Map? (The String version clearly looks like it was meant to be a Map but when passing as a Map I get an error saying that it was passing a String.)

An acceptable alternative would also be an easy way to convert Strings to Maps but I would prefer being able to directly pass a Map.

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    The documentation says "collections" are supported which I would interpret to include maps. But maybe the problem is the same one that afflicts @RestResource signatures where maps of objects are not supported. I guess passing the map as a JSON string is a work-around given that Apex has decent JSON support (and of course so does JavaScript).
    – Keith C
    Commented Jun 8, 2015 at 17:03
  • @KeithC Hmmmm I might look into doing the JSON version... although I'm already almost done writing the code that will parse a String into a Map.
    – dphil
    Commented Jun 8, 2015 at 17:06
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    A good thing about JSON is that escaping of embedded quotes or line feeds in strings is taken care of.
    – Keith C
    Commented Jun 8, 2015 at 17:13
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    JSON is absolutely better than rolling your own parser.
    – Adrian Larson
    Commented Jun 8, 2015 at 17:19

2 Answers 2


I ended up using JSON to parse it:

String jsonPageParams{get; private set;}


  jsonPageParams = JSON.serialize(currPageParams);


  Map<String, Object> parsedParams = (Map<String, Object>)JSON.deserializeUntyped(jsonPageParams);

I had to use a Map of String, Object for some reason even though it's technically a Map. I just have to cast the result to a String whenever I get the value.


I know this has been answered but I would like to comment anyway.

The way I handled it is by passing Keys and Values as string and recreating the Map in apex.

Here is an excerpt:

So if I were to pass a map through JS, I would send the keys and values as separate JS Array types. Now, note that remoting lets us pass the List(array) of sObject, so the values can be a List Visualforce.remoting.Manager.invokeAction('{!$RemoteAction.jsRemotingControllerv1.createAccountsMap}', keys, accounts_values);

Over at the contoller side, I'd recreate the map like this:

Map<String,Account> accountMap = new Map<String,Account>();
for (Integer i = 0 ; i < keys.size(); i++) {

This example may not be depicting a real lide scenario but it gives an alternative when we no choice but to pass a Map around.

For the complete code, you can see my post here https://salesforcemann.wordpress.com/2016/11/16/javascript-remoting-create-account-record-using-single-sobject-list-map/

  • 1
    link only answers usually get deleted. The contents of your link need shown on your post.
    – dphil
    Commented Nov 16, 2016 at 12:56
  • Oops.. okay will update it soon...
    – human
    Commented Nov 16, 2016 at 14:11

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