I have exhausted all the suggested solutions provided here in relation to my issue with no success. I am working on creating some graphs using the Dygraphs library. The JavaScript code snippet below represents just a fraction of the complete function, as I am generating a total of 5 graphs in a similar manner.
<script>
designRawGraphs();
function designRawGraphs() {
var g1 = new Dygraph(
document.getElementById("graphdiv"),
[ <%=sDataForROI1Graph%> ],
{
labels: <%=sLabelsForROI1Graph%>,
connectSeparatedPoints: true,
animatedZooms: true,
highlightCircleSize: 3,
highlightSeriesOpts: {
highlightCircleSize: 6
},
drawPoints: true,
title: 'ROI 1 - Region of Interest',
ylabel: 'Raw Fluorence Intensity',
xlabel: 'Time (seconds)'
}
);
}
</script>
In the backend code, I am serializing and serving both the sDataForROI1Graph and sLabelsForROI1Graph global variables as strings. These variables are populated with data from a database query in a specific format required by Dygraphs. The JavaScript code is embedded within an asp:UpdatePanel. When a button within the UpdatePanel is triggered, the query returns new results causing changes in both global variables, however, the graphs are not updated. I have configured the button as a Trigger as shown below...
<Triggers>
<asp:AsyncPostBackTrigger ControlID="RemoveAllbtn" />
</Triggers>
... and the code for the button is simply:
Protected Sub RemoveAllbtn_Click(ByVal sender As Object, ByVal e As EventArgs) Handles RemoveAllbtn.Click
RemoveAll()
End Sub
When the UpdatePanel is removed, everything functions as expected due to a full post-back. Despite attempting various workarounds including injecting JavaScript code, the issue remains unresolved. My main query is why these global variables cannot be accessed from the client-side when nested within the UpdatePanel? What is the most effective approach to overcome this obstacle? I have explored using hidden Textboxes, HiddenFields, Labels, Literals controls, but none have provided a solution.
UPDATE
The suggested solution mentioned below was helpful and it worked successfully. However, even after spending significant time on the issue and implementing the solution, I discovered that my problem persists with an unusual reason. Outside of the UpdatePanel on the client-side, I have included an
<asp:HiddenField ID="hidfieldforROI1" runat="server"/>var dataforROI1 = document.getElementById('<%= hidfieldforROI1.ClientID %>').value;
In the backend, I am setting the value for the hidfieldforROI1 Control. However, I am encountering the following unexpected error:
error BC30451: 'dataforROI1' is not declared. It may be inaccessible due to its protection level.Any suggestions or insights would be greatly appreciated.