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Ticket T212881
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GridView ContextMenu Event fires too fast - How to hide particular Item based on Row Values

created 10 years ago

Dear Devexpress,
I have implemented your Gridview control into my ASP.NET MVC web application and I have a problem with the context menu.
I have to turn the visibility off, on some of the context menu options depending on a model property.
Here is my example, to clarify:
I added two items to the context menu:
settings.ClientSideEvents.ContextMenu = "OnContextMenuInit";
settings.FillContextMenuItems = (sender, e) =>
{
e.Items.Clear();
e.Items.Add("Módosítás", "modosit");
e.Items[0].Image.Url = "~/Content/images/edit.png";
e.Items[0].Image.Width = 20;
e.Items[0].Image.Height = 20;
e.Items.Add("Készrejelentés", "keszrejel");
e.Items[1].Image.Url = "~/Content/images/commit.png";
e.Items[1].Image.Width = 20;
e.Items[1].Image.Height = 20;
} depending on a model property I would like to hide the second option, before the context menu appears:
(I'm currently trying via javascript, I have implemented the context menu client side event, to catch the context menu init)
function OnContextMenuInit(s, e) {
if (e.objectType == "row") {
JuttKarbGrd.GetRowValues(e.index, 'n_sortipus;', function (data) {
var tipus = data[0];
e.menu.GetItemByName('keszrejel').SetVisible(tipus == 1);
});
}
}

This piece of code turns the option's visibility off, BUT the context menu appears before the end of the ContextMenu event.
I have clicked with right click on a row, where the n_sortipus not equals with 1, and I can see the whole context menu, before the code hides the second option.
1.jpg

After a second it disappears:
2.jpg

Is this a bug? Is there a solution for my problem?

Thanks,
Gergő

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Answers approved by DevExpress Support

created 10 years ago (modified 10 years ago)

Hello Gergő,

The client-side ASPxClientGridView.GetRowValues returns results via a callback (i.e., it operates asynchronously).
So, the context menu is shown before the callback result is ready.

You can make the required field ("n_sortipus") a part of the GridViewSettings.KeyFieldName and use the client-side ASPxClientGridView.GetRowKey method instead (it works without a callback):

JavaScript
function OnContextMenuInit(s, e) {  
    if (e.objectType == "row") {  
        //JuttKarbGrd.GetRowValues(e.index, 'n_sortipus;', function (data) {  
        //var tipus = data[0];  
        var tipus = s.GetRowKey(e.index);  
        e.menu.GetItemByName('keszrejel').SetVisible(tipus == 1);  
        //});  
    }  
}

If you need further assistance, please provide us with a sample project that illustrates your current progress.

    Show previous comments (1)
    Mike (DevExpress) 10 years ago

      Hello,

      >>Sadly, I have to use the GetRowKey method…

      I believe that you are talking about the GetRowValues method.

      >>Is there a way to solve this with using the callback function?

      You can make the required field ("n_sortipus") a part of GridViewSettings.KeyFieldName and use the client-side ASPxClientGridView.GetRowKey method instead, for example:

      C#
      settings.KeyFieldName = "REAL_ID_HERE;n_sortipus";  
      JavaScript
      function OnContextMenuInit(s, e) {  
    if (e.objectType == "row") {  
        var tipus = s.GetRowKey(e.index).split('|')[1];  
        alert(tipus);  
        e.menu.GetItemByName('keszrejel').SetVisible(tipus == 1);  
    }  
}
      HG HG
      Halász Gergő 10 years ago

        Thanks, it solved my problem!

        Mike (DevExpress) 10 years ago

          You are always welcome!

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