I would really appreciate some guidance. This is probably simple to some of you, but i can't figure it out.
Thanks for any input.
THE REQUIREMENT
I have a multi-tabbed control. One each tab, I have a custom reportviewer control.
I have added a custom attribute to the reportviewer in the code behind called "data-report-param".
I need to access the value of custom attribute "data-report-param" on the current tab on the client-side using javascript.
I have tried several ways including the following, but can't get to the value that is being created in the DOM.
MY CODE
//Attempt 1
var reportparamattribute = $('#ReportViewer1');
var reportparametervalue = reportparamattribute.getAttribute('data-report-param');
//Attempt 2
var reportparamattribute = document.getElementById('<%= ReportViewer1.ClientID %>');
var reportparametervalue = reportparamattribute.getAttribute('data-report-param');
//Also tried accessing the dataset
var reportparametervalue = reportparamattribute.dataset.report-param;
WHAT IS BEING PRODUCED IN THE DOM
('ctl00_m_g_66e41117_8ff5_4650_bf4d_7a4a25e326f3_ctl01_ReportViewer1_ctl04').control.HideActiveDropDown();" data-report-param="1068" interactivedeviceinfos="(Collection)">
('ctl00_m_g_9d6a6c3c_11d0_4e03_bbd2_b907172c437d_ctl01_ReportViewer1_ctl04').control.HideActiveDropDown();" data-report-param="1068" interactivedeviceinfos="(Collection)">
UPDATE- WORKING CODE BELOW
The key was passing the custom data attribute from the code behind and then accessing it in the $.cache as @popnoodles below indicated, and passing the clientID of the reportviewer into the javascript function to get to the current instance of the webpart child controls.
<input type="hidden" id="<%= ASP_SSRS.ClientID %>_myDataState"
onchange="compareUnitValues(this.id, this.parentNode.id, '<%= ReportViewer1.ClientID %>', '<%= ASP_SSRS.ClientID %>', '<%= btnSendHiddenField.ClientID %>');" />
<script type ="text/javascript">
function compareUnitValues(elemt, parent, reportviewerID, value1, value2) {
var myDataUnit = $("#" + elemt),
parentObject = $("#" + parent),
reportviewerObject = $("#" + reportviewerID),
ssrs = $("#" + value1),
btnSend = $("#" + value2);
var myDataUnitValue = myDataUnit.val();
var myDataUnitJSON = jQuery.parseJSON(myDataUnitValue);
var currentmyDataUnit = myDataUnitJSON.currentUnit.objectId;
var sessioncurrentObjectId = document.getElementById('<%= hiddenCurrentObjectId.ClientID %>').value;
ssrs.val(myDataUnitValue);
var currentReportViewerParam = $("#" + reportviewerID).attr("data-report-param");
if (currentmyDataUnit != currentReportViewerParam) {
btnSend.trigger("click");
}
}
FROM CODE BEHIND CREATE THE CUSTOM DATA ATTRIBUTE
ReportViewer1.Attributes.Add("data-report-param", parsedObjectId)