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I've been chasing down an elusive problem for some time now and I've narrowed it to a logic change in the ListViewItemBinder.refresh() method between Kendo UI versions 2015.2.902 and 2015.3.930 (the issue happens on every version since 2015.3.930).  We have a mobile list view that is bound to a data source.  The template for the ListView creates a Touch widget and a tap handler for each list item.  The tap events and event handlers are working just fine, within this tap handler we change several properties on the data items within the DataSource.  The issue is that in v2015.2.902 these property changes cause the ListView to refresh itself and properly reflect those property changes, but in 2015.3.930 the ListView does *not* refresh itself even though the code has not changed on our end.

I finally managed to isolate the issue to a logic change within ListViewItemBinder.refresh() between the two versions, specifically within the first "if" block.  Here's the logic in 2015.2.902:

if (action === "itemchange" && !listView._hasBindingTarget()) {
  item = listView.findByDataItem(dataItems)[0];
  if (item) {
    listView.setDataItem(item, dataItems[0]);
  }
  return;
}

In 2015.2.902, action === "itemchange" resolves to true and !listView._hasBindingTarget()) resolves to false, so this block is skipped.  The code eventually drops to the following if/else if/else blocks and eventually calls the very last "else" block which actually triggers the kendo code that re-executes the template and replaces the HTML content (comment is mine):

if (action === "add" && !groupedMode) {
    var index = view.indexOf(dataItems[0]);
    if (index > -1) {
        addedItems = listView.insertAt(dataItems, index);
        addedDataItems = dataItems;
    }
} else if (action === "remove" && !groupedMode) {
    addedItems = [];
    listView.remove(dataItems);
} else if (groupedMode) {
    listView.replaceGrouped(view);
}
else if (prependOnRefresh && !listView._filter) {
    addedItems = listView.prepend(view);
    addedDataItems = view;
}
else {
    listView.replace(view); // <-- This is where the template is re-executed
}

However, in v2015.3.930, the first "if" block I listed earlier was re-written as follows:

if (action === "itemchange") { // action is indeed "itemchange"
    if(!listView._hasBindingTarget()) { // This evaluates to false
        item = listView.findByDataItem(dataItems)[0];
        if (item) {
            listView.setDataItem(item, dataItems[0]);
        }
    }
    return; // We hit this return statement, thus the "refresh" block is never called
}

As I mentioned in the comments, this logic change causes us to immediately hit the "return" statement and we never drop into the lower if/else if/else block where the template gets re-executed.  My questions then are as follows:

  1. What exactly was the purpose of this change?
  2. Is the scenario I've laid out actually exposing a bug, or is there something that I'm doing incorrectly that I can resolve within my own code?

I've tried to mock up this scenario in the Dojo but as of yet haven't quite been able to do it, hence the long post.  Thanks for taking a look!

Boyan Dimitrov
Telerik team
 answered on 05 Jul 2019
2 answers
6.1K+ views

I have a grid with 10000+ items but with the menu filter mode enabled this poses a bit of a lag issue when trying to populate all of the dropdown options for the filter menu.

 

So I use:

filterable: {mode: "menu, row"}

 

Is it possible to have the menu filter mode enabled but disable it on a column by column basis? (See attached image for example of what I mean)

 

As always, thank you for your help.

Jamie
Top achievements
Rank 1
 answered on 05 Jul 2019
4 answers
1.6K+ views

Hello,

After a countless of attempts and adjustements, it is still impossible to retrieve data from a datasource (to load a grid).

I use an API Net.Core that returns JSON (with Odata nugets).

Everything is OK : json is return, callback is triggered (I check with Fiddler 4 of Telerik).

HTML side : I use Odata type for the Transport (I noticed it is impossible to get a callback from my API if I use "webapi" or anything else for instance).

HTML file (body):

<div id="example">
            <div id="grid"></div>
            <script>
   
   $(document).ready(function () {
   
   var dSource = new kendo.data.DataSource({
      type: "odata",
      dataType: "json",
      serverPaging: true,
                        serverSorting: true,
                        pageSize: 12,
      
      transport: {
        read: "https://localhost:44363/api/students"
          
         }
     });
   // read data from the remote service
            dSource.read();
   var data = dSource.data();
   alert(data[0]);
   
   });
           
            </script>
        </div>

 

 

Alex Hajigeorgieva
Telerik team
 answered on 02 Jul 2019
4 answers
2.5K+ views

I'm doing something like this in my css to adjust how the tabs on the render:

.k-tabstrip-items {
align-self: left;
background-color: green;
margin-top: 8px;
margin-bottom: 8px;
height: 32px;
border: 1px solid black !important;
width: 70% !important;
margin-left: 5%;
}

But I need to dynamically adjust the margin so sometimes the tabstrip is centered and sometimes it has the margin above.

So I want to conditionally add something like this:

.k--items-addon {
margin-right: auto;
margin-left: auto;
}

I don't see anything in the API that allows me to pass a class for the  items so that I can dynamically change things in my template or class. Any ideas?

 

Dimiter Topalov
Telerik team
 answered on 02 Jul 2019
5 answers
2.4K+ views

I am returning errors from server and catch it in kendo datasource error event.In this event I am trying to prevent close popup editor, but it works only first time, after clicking update second time, the window closes.
I searched a lot but could not find a solution

 

City = {
    InitializeGrid: function () {
 
        function LoadCities(url, success) {
            Common.serverRequest(url, success);
        }
 
        function UpdateCity(url, params, success) {
            Common.serverRequestParams(url, params, success);
        }
 
        function InsertCity(url, params, success) {
            Common.serverRequestParams(url, params, success);
        }
 
        function DeleteCity(url, id, success) {
            Common.serverRequestParams(url, id, success);
        }
 
        dataSource = new kendo.data.DataSource({
            transport: {
                read: function (e) {
                    LoadCities("/home/read", function (res) {
                        e.success(res);
                    });
                },
 
                update: function (e) {
 
                    UpdateCity("/home/update", e.data, function (res) {
                        var grid = $("#grid").data("kendoGrid");
                        if (res.success) {
                            grid.dataSource.read();
                        } else {
                            e.error("", "", res.error);
                            grid.cancelChanges();
                        }
 
                    });
                },
                create: function (e) {
                    InsertCity("/home/insert", e.data, function (res) {
                        var grid = $("#grid").data("kendoGrid");
 
                        if (res.success) {
                            grid.dataSource.data(res.data);
                        } else {
                            e.error("", "", res.error);
                            grid.cancelChanges();
                        }
                    });
                },
                destroy: function (e) {
                    DeleteCity("/home/delete", e.data, function (res) {
                        var grid = $("#grid").data("kendoGrid");
 
                        if (res.success) {
                            grid.dataSource.data(res.data);
                        } else {
                            e.error("", "", res.error);
                            grid.cancelChanges();
                        }
 
                    });
                }
            },
            error: function (e) {
                var grid = $("#grid").data("kendoGrid");
                grid.one("dataBinding", function (e) {
                    e.preventDefault(); // it occures only first time
                });
                alert(e.errorThrown);
 
            },
            pageSize: 20,
            schema: {
                model: {
                    id: "Id",
                    fields: {
                        Name: { type: "string" },
                        EndDate: { type: "date" },
                        CreateDate: { type: "date" }
                    }
                }
            }
        });
 
        $("#grid").kendoGrid({
            dataSource: dataSource,
            height: 750,
            selectable: "single",
            filterable: true,
            sortable: true,
            pageable: true,
            toolbar: [{ name: "newRecord", text: "New Record" }, { name: "editRecord", text: "Edit REcord" }, { name: "deleteRecord", text: "Delete" }],
            columns: [
                { field: "Name", title: "Name" },
                { field: "EndDate", title: "End Date", format: "{0:dd.MM.yyyy hh:mm}" },
                { field: "CreateDate", title: "Create Date", format: "{0:dd.MM.yyyy hh:mm}" }
            ],
            editable: {
                mode: "popup",
                confirmation: false,
                template: kendo.template($("#popup_editor").html())
            }
        });
 
        $("#grid").on("click", ".k-grid-newRecord", function () {
            Common.gridAdd('grid', 'New Record');
        });
 
        $("#grid").on("click", ".k-grid-editRecord", function () {
            Common.gridEdit('grid', 'Edit Record');
        });
 
        $("#grid").on("click", ".k-grid-deleteRecord", function () {
            Common.gridDelete('grid');
        });
 
    }
}

 

mvc controler

public class HomeController : Controller
    {
        List<City> cities;
        public string error { get; set; }
        public bool isSuccess { get; set; } = true;
         
 
        public ActionResult Index()
        {
            cities = new List<City>();
            Session["city"] = cities;
            return View();
        }
 
        public ActionResult Read()
        {
            var result = (List<City>)Session["city"];
            return Json(result);
        }
 
        public ActionResult Update(City item)
        {
            var result = (List<City>)Session["city"];
 
            if (string.IsNullOrEmpty(item.Name))
            {
                error = "Name is required";
                isSuccess = false;
            }
 
            result.Where(w => w.Id == item.Id).SingleOrDefault(s => s == item);
 
            return Json(new { success = isSuccess, error =error, data = item });
        }
 
        public ActionResult Insert(City item)
        {
            var result = (List<City>)Session["city"];
 
            item.Id = result.Count;
            item.Id++;
 
            if (string.IsNullOrEmpty(item.Name))
            {
                error = "Name is required";
                isSuccess = false;
            }
 
            result.Add(item);
 
            return Json(new { success = isSuccess, error = error, data = item });
        }
 
        public ActionResult Delete(City item)
        {
            var result = (List<City>)Session["city"];
 
            result.Remove(item);
 
            return Json(new { success = isSuccess });
        }
    }
Alex Hajigeorgieva
Telerik team
 answered on 02 Jul 2019
1 answer
3.0K+ views

Hi there,

How do you customise the image on the loading spinner for a Kendo Grid?  I have an animated gif called 'loading.gif' that I wish to use instead of the default image currently.

Thanks, Mark

Patrick | Technical Support Engineer, Senior
Telerik team
 answered on 01 Jul 2019
5 answers
497 views

Hello, 

I'm trying to implement kendo ui Scheduler . 
But I realised that when I have many events in the same day I could see only two events and the others are collapsed on "three points".
When I click on the point it redirect me to Day view to see all the planned events.

I really want to remove the Day view and show only Month and Agenda Views.
It is possible to modify the code so when I click on the "three points" it redirect me to the Agenda view or could the Month view be resized dynamically depending on the number of the events ? 
I tried to modify the CSS of the schudeler , but I didn't like the result 

  

<style>
        .k-scheduler-table td, .k-scheduler-table th
        {
          height: 15.5em;
        }
        .k-scheduler-monthview .k-scheduler-table td
        {
          height: 15.5em;
        }
 
 .k-scheduler-timecolumn{
    visibility:collapse !important;
    width:0 !important;
.k-more-events > span {
  margin-top: 0em;
  height: 20px;
}
 
div.k-more-events {
  font-size: 12px;
  height: 20px;
}
.k-scheduler-table td, .k-scheduler-table th {
     height: 1em;
     padding: .334em .5em;
     font-size: 100%;
}
</style>    

 

Thank you in advance, 

Best. 

Ivan Danchev
Telerik team
 answered on 01 Jul 2019
4 answers
627 views
The following code to generate some rectangles with text items (see attached).  What do I need to do to center each text item in its rectangle?  I see there's a Layout, but I'm not sure how to combine rectangles, paths and groups into on of those.

 

var vLines = [5, 90, 175, 260, 345, 430, 515, 600];
var vLines = [5, 90, 175, 260, 345, 430, 515, 600];
 
...
 
$.each(vLines, function (index, value) {
    var group = getBox("line " + count++, "line " + count++, "line " + count++);
    group.transform(geom.transform().translate(10, value));
    surface.draw(group);
});
 
....
 
function getBox(text1, text2, text3) {
 
    var lineColor = "#9999b6";
    var lineWidth = 2;
    var fontNormal = "12px Arial";
 
    var group = new draw.Group();
    var rect = new geom.Rect([0, 0], [160, 75]);
    var path = draw.Path.fromRect(rect, { stroke: { color: lineColor, width: lineWidth } });
    group.append(path);
 
    if (text1) {
        group.append(new draw.Text(text1, new geom.Point(10, 10), { font: fontNormal }));
    }
 
    if (text2) {
        group.append(new draw.Text(text2, new geom.Point(10, 30), { font: fontNormal }));
    }
 
    if (text3) {
        group.append(new draw.Text(text3, new geom.Point(10, 50), { font: fontNormal }));
    }
             
    return group;
}

 

 

Thanks

Alex Hajigeorgieva
Telerik team
 answered on 01 Jul 2019
8 answers
949 views

Hi, in our app, customers can create "custom Fields", and they can have any title they want.

Ideally, we always prefer to keep original values in javascript objects without encoding them, and use templates to encode if needed.

I have this very "limit" case, where the title of a columns is "<script>alert(1)</script>".

https://dojo.telerik.com/@foxontherock/imacAYOR/3

There are 3 cases, one with script, one with bold, both with templating, and the last one, bold without template (all default)

I am able to use a groupTemplate and headerTemplate to display them correctly.

But, I tried several methods to make the "columnMenu" appear correctly, I never found a solution.

I tried the "columnMenuInit", but the "alert" appear before the init event.

What I can do for now is set "menu=false" for these columns...

I don't want to "htmlEncode" the title property itself.

Is it possible to set a custom template on the kendoMenu that is displayed to choose the column, or is it possible to set a setting to let the menu encode the text?

For exemple, I can set a title like <b>mytext</b> and the text will appear as bold in the menu!

I think that you forgot to encode the title when the columnmenu is displayed.

The "encode" parameter correctly encode the value, but doesn't affect the title.

Maybe we should get a encodeTitle attribute?

I think that all of this should work correctly without any custom templates.

<note>
You can't say that you don't support it,
because, you did it correctly in the "drop zone" when grouping,
the title is htmlencoded without any need for custom template!!!
just try it with the "bold no template" column and you'll see.
</note>

 

Georgi
Telerik team
 answered on 01 Jul 2019
7 answers
2.8K+ views
Hi, I have a Kendo Grid with column templates to handle date formatting, null values, etc., and the columns are set to sortable.  However, when I click a column header to sort the sort arrow changes but the data does not sort. Below is the grid definition.  Any ideas would be very much appreciated!

var gridDataSource = new kendo.data.DataSource({
    data: results,
    total: results.length,
    pageSize: 20,
    schema: {
        model: {
            id: "id",
            fields: {
                attributes: { type: "object" }
            }
        }
    }
});
 
//Build the Kendo UI grid
var kendoDataGrid = $("#dataGrid").kendoGrid({
    dataSource: gridDataSource,
    columns: GetGridColumns(),
    scrollable: true,
    pageable: true,
    resizable: true,
    sortable: true,
    selectable: "row",
    navigatable: true,
    height: gridHeight,
    editable: false
}).data("kendoGrid");
Alex Hajigeorgieva
Telerik team
 answered on 28 Jun 2019
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