How to pass a parameter through to a Rest Service in Xpages - rest

Question

XPages Dojo Data Grid and Custom REST Service
*** Note: Mine is an XPINC application!
I've managed to get the above method working, but I want to pass a parameter through to the Rest Service in order to build a better return set.
In the above example it the script looks like this:
<script>
var jsonStore = new dojo.store.JsonRest(
{target:"CURRENT_PAGE_NAME_HERE.xsp/gridData"}
);
var dataStore = dojo.data.ObjectStore({objectStore: jsonStore});
</script>
But, I want to do something like this:
<script>
var jsonStore = new dojo.store.JsonRest(
{target:"CURRENT_PAGE_NAME_HERE.xsp/gridData?OpenXpage&para1=Value1&para2=Value2"}
);
var dataStore = dojo.data.ObjectStore({objectStore: jsonStore});
</script>
I've tried a number of methods, but no success.
Method 1 - Use Request/View/SessionScope variable
On the "CURRENT_PAGE_NAME_HERE.xsp" I've added a "xp:this.beforePageLoad" event to create Scope variable to hold para1 and para2 taken from the paramValues of the URL.
I thought a simple requestScope would store them so I could pick them up when the "CURRENT_PAGE_NAME_HERE.xsp/gridData" was called. However, the Rest Service is called in the "onClientLoad" event of the page and the Scope variables don't seem to be available at this time.
Method 2 - Inline Javascript
I've also tried "${javascript:viewScope.para1;}" to pass it through:
<script>
var jsonStore = new dojo.store.JsonRest(
{target:"CURRENT_PAGE_NAME_HERE.xsp/gridData?OpenXpage&para1=${javascript:viewScope.para1;}&para2=${javascript:viewScope.para2;}"}
);
var dataStore = dojo.data.ObjectStore({objectStore: jsonStore});
</script>
This didn't work.
Method 3 - Hardcoding
I have hardcoded the values.
<script>
var jsonStore = new dojo.store.JsonRest(
{target:"CURRENT_PAGE_NAME_HERE.xsp/gridData?OpenXpage&para1=Apples&para2=Oringes"}
);
var dataStore = dojo.data.ObjectStore({objectStore: jsonStore});
</script>
This works! But, only for Apples & Oranges
I'm starting to look at using an Environment Variable to pass the values, but this just seems to be more of a hack than a solution.
Any help or guidance would be appriciated.

Answer 1

Dan,
You may have a couple of things to check.
First thing is that you need to use # instead of $ to avoid
evaluating the expression on page load
In some cases you cannot inject SSJS into the CSJS - if this is "evaluated" at page load time. You could be hitting this.... An easy
way to check is to create a couple of local variables and assign the
values from your SSJS. That'll make it easy to debug in the browser.
I guess you could do something like this (and then you can set a breakpoint in your browser and see if the values are as expected).
<script>
var p1 = "#{javascript:viewScope.para1;}";
var p2 = "#{javascript:viewScope.para2;}";
var jsonStore = new dojo.store.JsonRest(
{target:"CURRENT_PAGE_NAME_HERE.xsp/gridData?OpenXpage&para1=" + p1 + "&para2=" + p2}
);
var dataStore = dojo.data.ObjectStore({objectStore: jsonStore});
</script>
If this does not work then I suggest creating a script block in the beginning of your page with a simple little "getter" method for each variable (or the entire arg. string) and then use the SSJS there.
Happy coding!
/John

Answer 2

As this is an XPINC appplication, I felt it was safe to just use an Environment Variable.
On the view action button that calls the XPage, I write the Environment variable down onto the system. Then when I open the Xpage in the client, the Rest Service is hardwired to:
var param1:String = session.getEnvironmentString("Param!");
I still think this feels more like a hack, but with Notes, I'm getting used to it. LOL