Questions on Kendo UI for jQuery Forum

1 answer

553 views

Datasource change and error events do not fire

Hi guys, I'm new to Kendo and am struggling to understand why the change and error event handlers defined in my datasource are not called. I have a grid with popup edit functionality. I would like to display a notification when a record has create, update or delete operations performed on it. Any advice is appreciated.

<div id="grid" style="margin-bottom: 20px"></div>

<script type="text/javascript">

var supporterDataSource = new kendo.data.DataSource({

transport: {

read: {

url: "<%= supporters_admin_customer_support_clients_url + '.json' %>",

dataType: 'json',

error: function (xhr) {

var errors = $.parseJSON(xhr.responseText).errors;

popupNotification.show(errors);

}

},

schema: {

user_id: { type: 'number' },

full_name: { type: 'string' }

}

});

var supporteeDataSource = new kendo.data.DataSource({

transport: {

read: {

url: "<%= supportees_admin_customer_support_clients_url + '.json' %>",

dataType: 'json',

error: function (xhr) {

var errors = $.parseJSON(xhr.responseText).errors;

popupNotification.show(errors);

}

},

schema: {

user_id: { type: 'number' },

full_name: { type: 'string' }

}

});

</script>

<script id="tooltip-template" type="text/x-kendo-template">

<span class="k-widget k-tooltip k-tooltip-validation k-invalid-msg">

<span class="k-icon k-warning"></span>

#=message#

</span>

</script>

<script id="popup_editor" type="text/x-kendo-template">

<div id="popServerErrorSummaryPlaceholder" style="display:none"></div>

<div class="k-edit-label" style="padding-right: 10px">

<label for="Customer Support Rep">Customer Support Rep</label>

</div>

<input name="Customer Support Rep"

data-bind="value:supporter_name"

data-value-field="user_id"

data-text-field="full_name"

data-source="supporterDataSource"

data-role="autocomplete"

required>

<input type="hidden" name="SupporterID" data-bind="value:supporter_id">

<div class="clear"></div>

<div class="k-edit-label" style="padding-right: 10px">

<label for="Researcher">Researcher</label>

</div>

<input name="Researcher"

data-bind="value:supportee_name"

data-value-field="user_id"

data-text-field="full_name"

data-source="supporteeDataSource"

data-role="autocomplete"

required>

<input type="hidden" name="SupporteeID" data-bind="value:supportee_id">

</script>

<% content_for :javascript do %>

var crudServiceBaseUrl = "<%= admin_customer_support_clients_url %>",

dataSource = new kendo.data.DataSource({

transport: {

read: {

url: crudServiceBaseUrl + '.json',

dataType: 'json',

error: function (xhr) {

var errors = $.parseJSON(xhr.responseText).errors;

popupNotification.show(errors);

}

},

create: {

url: crudServiceBaseUrl + '.json',

type: "POST",

dataType: 'json',

change: function(data) {

popupNotification.show('Customer support client created successfully');

},

error: function (xhr) {

var errors = $.parseJSON(xhr.responseText).errors;

popupNotification.show(errors);

}

},

update: {

url: function (data) {

return crudServiceBaseUrl + '/' + data.id + '.json';

},

type: 'PATCH',

dataType: 'json',

change: function (data) {

popupNotification.show('Customer support client updated successfully');

},

error: function (xhr) {

var errors = $.parseJSON(xhr.responseText).errors;

popupNotification.show(errors);

}

},

destroy: {

url: function (data) {

return crudServiceBaseUrl + '/' + data.id + '.json';

},

type: 'DELETE',

dataType: 'json',

change: function (data) {

popupNotification.show('Customer support client deleted successfully');

},

error: function (xhr) {

var errors = $.parseJSON(xhr.responseText).errors;

popupNotification.show(errors);

}

},

parameterMap: function(options, operation) {

if (operation !== 'read') {

return {customer_support_client: kendo.stringify(options)};

}

},

pageSize: 20,

serverPaging: false,

serverFiltering: false,

serverSorting: false,

schema: {

model: {

id: 'id',

fields: {

id: {editable: false, nullable: true, type: 'number'},

supporter_id: {type: 'number'},

supporter_name: {type: 'string'},

supportee_id: {type: 'number'},

supportee_name: {type: 'string'},

created_at: {editable: false, type: 'date'},

updated_at: {editable: false, type: 'date'}

}

});

$('#grid').kendoGrid({

dataSource: dataSource,

editable: {

mode: 'popup',

template: kendo.template($('#popup_editor').html())

},

edit: function(e) {

$(e.container)

.find('input[name="Customer Support Rep"]')

.data('kendoAutoComplete')

.bind('change', function(e) {})

.bind('select', function(e) {

var csc = this.dataItem(e.item.index());

// Note .change is required to update underlying data source.

$('input[name="SupporterID"]').val(csc.user_id).change();

});

$(e.container)

.find('input[name="Researcher"]')

.data('kendoAutoComplete')

.bind('change', function(e) {})

.bind('select', function(e) {

var csc = this.dataItem(e.item.index());

// Note .change is required to update underlying data source.

$('input[name="SupporteeID"]').val(csc.user_id).change();

});

e.sender.editable.validatable._errorTemplate = kendo.template($('#tooltip-template').html());

// TODO - Chrome Hack - Remove this when jQuery is v1.8 or above.

$('.k-widget.k-window').css('webkit-transform', 'scale(1)');

},

toolbar: ['create'],

height: 500,

filterable: true,

sortable: true,

pageable: true,

columns: [{

field: 'supporter_name',

title: 'Customer Support Rep',

type: 'string'

}, {

field: 'supportee_name',

title: 'Researcher',

type: 'string'

}, {

field: 'created_at',

title: 'Created At',

type: 'date',

format: '{0:dd-MMM-yyyy hh:mm tt}',

parseFormats: ["yyyy-MM-dd'T'HH:mm:ss.zz"]

}, {

field: 'updated_at',

title: 'Updated At',

type: 'date',

format: '{0:dd-MMM-yyyy hh:mm tt}',

parseFormats: ["yyyy-MM-dd'T'HH:mm:ss.zz"]

}, {

command: ['edit', 'destroy'],

title: ' ',

width: '175px'

}]

});

var popupNotification = $("#popupNotification").kendoNotification().data("kendoNotification");

<% end %>

Grid

answered on 13 May 2014

3 answers

176 views

Authentification and CSS

Hello
For a project I have a strong requirement to manage authenticated users either using a CAS (Central Authentication Service) or as a second option a LDAP authenitcation
Is it something available when developping witthin Kendo UI?

Something else I will need to implement, changing CSS styles on the fly. In other words to be able to download a new CSS style file and change it on the fly?

Should it be easy to develop an app with Kendo UI, managing several languages languages?

many thanks by advance

BR

General Discussions

answered on 13 May 2014

1 answer

673 views

Native vs. emulated scrolling

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

ListView (Mobile)

answered on 13 May 2014

5 answers

631 views

How to define dependent method / calculated field in model schema

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:

var Category = kendo.data.Model.define({

id: "Id",

fields: {

Id: { type: "number", editable: false, nullable: true},

Title: { type: "string" },

SortOrder: { type: "number" }

}

var Product = kendo.data.Model.define({

id: "Id",

fields: {

Id: { type: "number", editable: false, nullable: true},

Title: { type: "string" },

CategoryId: { type: "number" },

Category: {},

CategorySortOrder: { defaultValue: function() { return this.get("Category.SortOrder"); }, nullable: true }

}

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?

MVVM

answered on 13 May 2014

3 answers

417 views

How to use QueryString Values in Kendo UI Mobile

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();

General Discussions

answered on 13 May 2014

1 answer

553 views

Customize item count message on grid footer when filter is applied

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

Grid

answered on 13 May 2014

2 answers

257 views

Kendo Grid DropDownList NewRecord Saving Issue In Popup Editing

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

$("#grid").kendoGrid({

dataSource: {

transport: {

read: {

url: "/fsMail/services/dataService.asmx/GetEmlContacts",

dataType: "Json"

},

update: {

url: "/fsMail/services/dataService.asmx/SaveContacts",

dataType: "json"

},

create: {

url: "/fsMail/services/dataService.asmx/SaveContacts",

dataType: "json"

},

destroy: {

url: "/fsMail/services/dataService.asmx/DeleteContact",

dataType: "json"

},

}, //end of transport

schema: {

model: {

id: "contactId",

fields: {

contactId: { editable: false },

businessName: { validation: { required: true} },

firstName: { validation: { required: true} },

lastName: { validation: { required: true} },

language: { nullable: true },

country: { nullable: true },

address: { nullable: true },

city: { nullable: true },

gsm: { nullable: true },

email: { nullable: true },

isActive:{type: "boolean",defaultValue: true}

}

}//end of model

},

pageSize: 10

},//end of schema

columns: [

{ field: "contactId",title: "ContactId", hidden: true },

{ field: "businessName", title: "Business Name", width: 200 },

{ field: "firstName", title: "Contact Title", width: 200 },

{ field: "lastName", title: "Last Name", hidden: true },

{ field: "language", title: "Language", width: 100, editor: langDropDownEditor},

{ field: "country", title: "Country", width: "100px", editor: countryDropDownEditor },

{ field: "address", title: "Address", hidden: true },

{ field: "city", title: "City", width: 100 },

{ field: "gsm", title:"GSM",hidden: true },

{ field: "email",title:"Email", hidden: true },

{ field: "isActive",title:"Active", hidden: true },

{ command: ["edit", "destroy"], title: " ", width: "160px" },

],

toolbar: ["create"],

editable: "popup",

filterable: true,

groupable: false,

sortable: true,

selectable: true,

pageable: {

refresh: true,

pageSizes: false,

buttonCount: 3

},

});

function langDropDownEditor(container, options) {

$('<input data-text-field="text" data-value-field="value" data-bind="value:' + options.field + '"/>')

.appendTo(container)

.kendoDropDownList({

autoBind: false,

dataSource: [

{ text: "English", value: "English" },

{ text: "German", value: "German" },

{ text: "French", value: "French" }

]

});

}

});

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

Grid

answered on 13 May 2014

3 answers

213 views

Filter option of Grid is not working after upgrading jquery from 1.7.0 to 1.10.0 (Only in IE)

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.

Grid

answered on 13 May 2014

1 answer

318 views

KendoUI Grid Filter operator startswith doesn't work with SQL index

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.

Grid

answered on 12 May 2014

2 answers

1.0K+ views

What is the regular expression used in Kendo's email validation?

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!

Validation

answered on 12 May 2014