Can't find ReportViewer event for rendering co

Question

I'm trying to fire an event (to remove a custom progress/status indicator) when the ReportViewer control is finished rendering. I've explored the events for the ReportViewer control and I can't seem to find one that actually fires when the report is complete.

I'm using Visual Studio 2010 and ASP.NET 4.

Thanks for your help.

Answer 1

I know this is old, but I wasn't satisfied with the polling approach. You can register a property change listener for changes to isLoading instead (as described here).

In summary, add a bit of javascript to the script manager e.g. in your form element:

<asp:ScriptManager ID="scriptManager" runat="server">
    <Scripts>
        <asp:ScriptReference Path="~/Reports/ReportViewer.js" />
    </Scripts>
</asp:ScriptManager>
<rsweb:ReportViewer ID="reportViewer" runat="server"/>

Then hook it up and add any client-side logic you need in ReportViewer.js:

Sys.Application.add_load(function () {
    $find("reportViewer").add_propertyChanged(viewerPropertyChanged);
});

function viewerPropertyChanged(sender, e) {
    if (e.get_propertyName() == "isLoading") {
        if ($find("reportViewer").get_isLoading()) {
            // Do something when loading starts
        }
        else {
            // Do something when loading stops
        }
    }
};

Answer 2

Try below code snippet:

<script type="text/javascript">
    var app = Sys.Application;
    app.add_init(ApplicationInit);

    function ApplicationInit(sender) {
        var prm = Sys.WebForms.PageRequestManager.getInstance();
        $('#ReportViewer1_ctl05').css('width', '1047px');
        if (!prm.get_isInAsyncPostBack()) {
            prm.add_endRequest(EndRequest)
        }
    }

    function EndRequest(sender, args) {
        var reportViewerControlId = "ReportViewer1";
        if (sender._postBackControlClientIDs[0].indexOf(reportViewerControlId) >= 0) {
            // do your stuff
        }
    }
</script>  

EndRequest function will be triggered once report rendering gets completed.

Answer 3

I achieve this using JQuery like so:

$(document).ready(function () {

document.getElementById('ctl00_ctl00_DefaultContent_AdminContent_reportViewer').ClientController.CustomOnReportLoaded = function () { 
alert('You see this after Report is Generated');
}
});

Answer 4

One option would be to continuously poll the isLoading property of the client side ReportViewer api. If the isLoading property returns true continue showing the progress indicator, if it returns false hide it and stop polling.

I haven't tried it myself but according to the documentation is look like it should work.