After releasing our first Kendo web app to the public we received a lot of feedback about the listview scrolling having a very bad performance. Some users on older smartphones weren't able to scroll down in an appropriate way at all.

So we decided to switch to native scrolling following this documentation: http://docs.telerik.com/kendo-ui/getting-started/mobile/native-scrolling

Instead of

new kendo.mobile.Application(document.body, { useNativeScrolling: true });

which completely screwed our whole app, we used data-use-native-scrolling="true" for the views.

After the change, scrolling was very performant, but we encountered a strange behaviour of the listviews regarding setting back the scroll position. We tried several ways of resetting the listviews scroll position:

1. via e.view.scroller inside the show() event

The documentation mentioned above states that there is no scroller object when using native scrolling, but in fact there is. So we used e.view.scroller.scrollTo(0, 0) at the end of the show() event.

Problems: several users reported that clicks on listview items were not correctly processed, instead a different listview items click event was executed, leading to the wrong details page.

2. via window.scrollTo(0,0) (as recommended in the documentation)

Problems: when going back using the phones back button, the listview jumps to the top before switching the view. Looks really awkward. Also, the listviews scrolling position is often not set back, it stays scrolled.

3. no scrollTo() at all

Problems: same as 2.


So I have 2 questions:

1. What would be the correct way to handle a view with a listview using native scrolling?

2. Is the abysmal scrolling performance with listviews normal? Even on the newest quad core devices we noticed a huge performance difference to native scrolling. Is there a way to optimize that?

Thanks in advance for any hint on this,
Roman

I have read how you can add a dependent method / calculated field to an ObservableObject (http://docs.kendoui.com/getting-started/framework/mvvm/observableobject), but I cannot find how you can define a dependent method / calculated field in the schema of a Model (http://docs.kendoui.com/api/framework/model). The instances of my Model are read from a remote kendo DataSource, so I need to define a dependent method / calculated field in the schema of the Model so that every instance of my Model automatically has this dependent method / calculated field. I've tried defining it as a field with the defaultValue set to the function and set nullable: true, but all the instances of my Model end up with null values in this field. Here's an example:


so when I get an instance of my Product from my kendo DataSource its CategorySortOrder property is null. So, how to define dependent method / calculated field in model schema?

I am sure this is a dumb question but I have not been succesful in finding the answer.  How do I get the value of a querystring example below im trying to get the querystring value from querystring parameter named ID and set it in the data part of my datasource.  my data source works hard coded.

var

 

 

dsDetails = new kendo.data.DataSource({

group: { field:

 

"_Title", dir: "asc" },

transport: {

read: {

url:

 

"../api/EventDetails",

dataType:

 

"json",

data: {

ID:

 

"4dc2fa9a-fb45-4ff5-b6d8-c246dbd3024e";

}

}

}

},

schema: {

model: {

fields: {

_ID: { type:

 

"string" },

_BeginDate: { type:

 

"string" },

_Cost: { type:

 

"string" },

_EndDate: { type:

 

"string" },

_EndTime: { type:

 

"string" },

_EventType: { type:

 

"string" },

_StartTime: { type:

 

"string" },

_SupportedBy: { type:

 

"string" },

_Title: { type:

 

"string" }

}

}

},

});

ds.read();

Hi Team,

We are using Kendo UI grid in our project. One of our project requirement is that, we wanted to customize the item count message appropriately after applying the filter. 

i.e for example,
if total items in a grid is 50 & paging is for 10 records, then the default message on the grid footer would be "1 - 10 of 50 items".
After I apply the filter, assume 7 items are matching, then i need to display a customized message on the grid footer like "1 - 7 of 50 items" but currently it is displaying as "1 - 7 of 7 items".

So, please advice us a possible solution to modify the filter message according with a relevant example.

Thanks,
Siva

Hi
I have an issue in Saving. I have dropDownList Language In Editor.  When I Edit existing record values are correctly send to My web Service And record saved ok.
But when i Click On Add New Record Button and Save it, DropDownList Data sends both Value and ext Field Like Language[text]=English, Language[value]=English
I have seen it in Firebug

Here is my code

Please help me how should i send value in Adding new record

I have downloaded new version of Kendoui for web which requires jquery-1.9 but recently I was using jquery-1.7.0
So tried to upgrade it and used jquery-1.7.0.migrate.js with jquery-1.10.0 so all the issues are fixed.
Grid is also working fine but while using filter option of Grid (clicking on filter text box or drop down button throws me an exception in IE
i.e. "Unhandled exception at line 11, column 4262 in http://localhost:1107/js/app/kendo.web.min.js
         0x800a01b6 - JavaScript runtime error: Object doesn't support property or method 'addBack"


I hope I will get solution on this.
Thanks in advance.

I have 5M rows in a table and its string column Name is indexed. When I query using LIKE 'ABC%' in SQL Server, the index is used so the executing time is very fast (0s).
However when I use operator "Startswith" in KendoUI Grid to filter the results (along with EntityFramework: DataSourceResult result = entity.ToDataSourceResult(request)), the index in the table isn't used so the executing time is very slow (30s) and equals to the executing time when I use operator "Contains".
On the contrary, filter operator "Equals" works well with the index and returns results very fast (0s). Could you let me know why the operator "Startswith" doesn't work with index, and how could I solve this problem?

Thanks.

I want to be sure that I'm validating with the same criteria on the server as I do on the client (using Kendo UI). But I can't seem to find the regular expression used under the covers. Anyone know where I might find it?

Thanks!

Hi, 

I have a web API which needs I have a web API which expect plain XML in the request body. My following program pass the XML as form data instead of raw request payload. Where am I doing wrong?

<!DOCTYPE html>
<html>
<head>
<title>Data Call</title>
<link href="kendo/styles/kendo.common.min.css" rel="stylesheet" type="text/css" />
<link href="kendo/styles/kendo.default.min.css" rel="stylesheet" type="text/css" />
<script src="kendo/js/jquery.min.js" type="text/javascript"></script>
<script src="kendo/js/kendo.web.min.js" type="text/javascript"></script>
<script type="text/javascript">
            $(document).ready(function() {
                      var dataSource = new kendo.data.DataSource({
                                                              type: "xml",
                                                              transport: {
                                                                                     read: {
                                                                                             type: 'POST',
                                                                                            dataType: "xml",
                                                                                            data: "xmlstring",
                                                                                            url: "https://9.9.9.9:8443/kendotest/api/GetAccounts",
                                                                                           data: { escape('<?xml version="1.0" encoding="UTF-8" standalone="no"?><accountrequest><accountno>23</accountno></accountrequest>')}, 
                                                                                           beforeSend: function(xhr)
                                                                                                        {
                                                                                                              xhr.setRequestHeader('X-Token','6452734413286534260')
                                                                                                         }
                                                                                        }
                                                                               }
                                                                       });
                                                                      dataSource.read();
                                                        });
                       </script>
</head>
<body>
                <div id="info"></div>
</body>  
</html>



Thanks,
Asat

Is it possible to do the following:
<label ><input type="checkbox" name="otherlang" value="Other" data-bind="checked:language, checked:othlang" />Other</label>

I have a list of checkboxes, want the value of each box checked to language and also want to make a textbox visible with othlang.
It seems othlang becomes visible but I do not get the value "Other" in language.