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 answered on 22 Nov 2025
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I'm trying to connect an external API that I manage via Tanstack query to a Kendo DropDownList. 

For this I've tried to look at the docs here: https://www.telerik.com/kendo-vue-ui/components/dropdowns/dropdownlist/virtualization

And saw that the DropDownList has a pagechange event that I can listen to to know when I need to fetch new data.
With this knowledge I made the following attempt: 
https://stackblitz.com/edit/yyrbvmlq-pnagnjwj?file=src%2Fmain.vue,src%2FdummyData.ts,src%2Fmain.js,index.html

However there's a problem:

When I scroll down to quick, not all 30 items are fetched and rendered, due to the early return in the pagechange handler function.
If I remove the early return, I run the risk of the same data being fetched multiple times which is also undesirable.

Is there an easy way to ensure all data is properly fetched on pagechange AND the same data is not fetched more than once?
I want both requirements to work nicely, even when the user scrolls down fast, slow, uses the scrollbar handle, pagedown, etc.

Or am I looking at this from completely the wrong angle and is there another, simpler way to achieve what I want?

Thanks in advance

Yanko
Telerik team
 answered on 11 Nov 2025
1 answer
22 views

Hi,

I’m using Kendo UI Scheduler for Vue in day view.
I need to control the order of overlapping events (e.g. show isPrivate=true events to the right side, and public ones to the left).

Right now, I can sort my eventList in Vue before passing it to the Scheduler, but the rendered order is not respected. The Scheduler seems to:

  • Render events by start time first.

  • Then order them internally by duration (longer events get positioned to the left, shorter ones to the right).

  • If two events share the same start time, the order is taken from an internal index, not from my sorted data.

This results in long, all-day or multi-hour events always being drawn first (on the left), pushing shorter events to the right — even if my sorted array has the shorter events first.

My question:
👉 Is there a built-in way to disable duration-based sorting of overlapping events in the Scheduler, or to explicitly control the rendering order of events (e.g. by a custom field like isPrivate)?

I already tried:

  • Sorting the data source before binding.

  • Using custom templates (eventTemplate, dayTemplate).

But the layout order still follows Scheduler’s internal logic.

Any guidance or workaround (config, event hook, or customization point) would be appreciated!

Thanks!

Filip
Telerik team
 answered on 07 Oct 2025
1 answer
47 views

<link  rel="preload" href="https://kendo.cdn.telerik.com/2021.1.119/js/kendo.all.min.js"  as="script"/>

https://kendo.cdn.telerik.com/2021.1.119/js/kendo.all.min.js

This is the Code

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="MassEditVCR.aspx.cs" Inherits="NGC.Web.Application.MassEditVCR" %>
<%@ Import Namespace="NGC.Language" %>

<!DOCTYPE html>

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title><%=NGC.Language.LM.GetString("LBL_MASS_EDIT_VCR")%></title>
		<%--<meta id="dataTableName" name="dataTableName" content="productionorder" runat="server" />--%>

		<meta id="securityID" name="securityID" content="60316" runat="server" />
	<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>

	<link  rel="preload"  href="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"  as="script"/>
	<link  rel="preload"  href="https://unpkg.com/@progress/kendo-vue-intl@2.7.3/dist/cdn/js/kendo-vue-intl.js"  as="script"/>
	<link  rel="preload" href="https://unpkg.com/@progress/kendo-vue-grid@1.2.0/dist/cdn/js/kendo-vue-grid.js"  as="script"/>
	<link  rel="preload" href="https://kendo.cdn.telerik.com/2021.1.119/js/kendo.all.min.js"  as="script"/>
	<link  rel="preload" href="https://unpkg.com/@progress/kendo-vue-excel-export@1.2.0/dist/cdn/js/kendo-vue-excel-export.js"  as="script"/>
	<link  rel="preload" href ="https://unpkg.com/@progress/kendo-theme-default@4.43.0/dist/all.css" as="style" />

	<link rel="stylesheet" href="https://unpkg.com/@progress/kendo-theme-default@4.43.0/dist/all.css" />
    
</head>
<body>
	<div id="sg1">
		<div id="maintoolbar" data-ngc-toolbartable="productionorder" data-ngc-role="toolbar">
				<div class="section">
				<h1><%=NGC.Language.LM.GetString("LBL_MASS_EDIT_VCR")%></h1></div>
		<div class="defaults noPrint">
	<input type="button" name="btn_boxtoggle" id="btn_boxtoggle" title="Collapser" value="Collapser" class="noPrint btncollapse BtnLayoutIcon BtnActive BtnIconExpand"  @click="toogleExpandedRows" >
		<button  @click="save" class="k-button BtnLayoutIconText BtnIconSave DoPost"><%=NGC.Language.LM.GetString("LBL_SAVE")%></button>
		<button  @click="saveAndSubmit" class="k-button BtnLayoutIconText BtnIconSave DoPost"><%=NGC.Language.LM.GetString("LBL_SAVE_SUBMIT")%></button>
		<button @click="refreshData" class="k-button BtnLayoutIconText BtnIconCancel DoPost"><%=NGC.Language.LM.GetString("LBL_CANCEL")%></button>
		<div class="custombutton">
		<button   @click="loadRecords" class="k-button BtnIconDownload  BtnLayoutIconText DoPost" id ="loadRecords"><%=NGC.Language.LM.GetString("LBL_LOAD_MORE")%></button>		
		<button @click="exportExcel" class="k-button BtnIconFileExcel  BtnLayoutIconText"><%=NGC.Language.LM.GetString("LBL_EXPORT_EXCEL")%></button>
		<button id="btn_configure" @click="configure" class="k-button BtnIconConfigure  BtnLayoutIconText" style="display: none;"><%=NGC.Language.LM.GetString("LBL_SELECT_COLUMNS")%></button>
		</div>
	</div>
	</div>
		<div id="toolbarSeparator"></div>
			<div class="otheritems">
				<NGC:Field ID="view" Label="LBL_VIEW" runat="server" IsDisabled="true" DataSource="viewname" Validation="ReadOnly" />
	</div>
		<kendo-grid :style="{height:  '600px', width: '100%'}" 
			id="renderedData"
			:data-items="gridData"
			:cell-render="cellFunction"
			:row-render ="rowRender"
			:resizable="true"
			:pageable="true"
			:skip= "skip"
			:take="take"
			:total="total"
			:sortable="true"
			:sort= "sort"
			:selectable="true"
			:selected-field="selectedField"
			:filter="filter"
			:filterable="true"
			:groupable="{footer: 'visible'}"
			:group= "group"
			:expand-field="'expanded'"
			:columns = "columns"
			 :edit-field="'inEdit'"
			:reorderable="true"
			@columnreorder="columnReorder"
			@datastatechange="dataStateChange"
			@selectionchange="onSelectionChange"
			@headerselectionchange="onHeaderSelectionChange"
			@expandchange="expandChange"
			@pagechange="pageChangeHandler" 
			>
			<template v-slot:myreasonCell="{props}">
			<td>
			<div :data-item="props.field" v-if="props.rowType !== 'groupFooter'" class="field"  data-ngc-hint="search"   :class="classObject(props)">
				<input  data-ngc-datatype="text" :value="props.dataItem[props.field]" v-on:change="setDataFields(props, event)" />
				<span   v-on:click="openSearch(props)">&nbsp;</span>
			</div>
			</td>
			</template>
			<template v-slot:checkboxCell="{props}">
				<td>
					<div :data-item="props.field"  v-if="props.rowType !== 'groupFooter'"  :class="classObject(props)">
					<input type="checkbox"   data-ngc-datatype="bit" :value="props.dataItem[props.field]" :checked="props.dataItem[props.field]" @change="setDataFields(props, event)"/>
					</div>
				</td>
			</template>
			<template v-slot:textareaCell="{props}">
				<td>
					<div :data-item="props.field" v-if="props.rowType !== 'groupFooter'"  class="field"  :class="classObject(props)">
					<textarea class="font" data-ngc-datatype="text" cols="60" rows="4" style="height: 50px; min-width: 200px; width: 100%;"  :value="props.dataItem[props.field]" v-on:change="setDataFields(props,event)"></textarea>
					</div>
				</td>
			</template>
			<template v-slot:dateCell="{props}">
			<td>
				<div :data-item="props.field" v-if="props.rowType !== 'groupFooter'"  class="field "	data-ngc-hint="datepicker"   :class="classObject(props)" >
				 <input  type="text" :id="(props.dataIndex === -1 ?  props.dataItem.value : props.dataIndex) + props.field" maxlength="10" :value="setFieldValue(props,'date')" 
				 data-ngc-datatype="date"   v-on:change="setDataFields(props ,event)">
				<span  data-ngc-role="datepicker"  v-on:click="__NGCdatepickerMethods.callDatePicker((props.dataIndex === -1 ?  props.dataItem.value : props.dataIndex) + props.field)">&nbsp;</span>
				</div>
			</td>
			</template>
			<template v-slot:intCell="{props}">
			<td>
					<div :data-item="props.field" v-if="props.rowType !== 'groupFooter'"  class="field " data-ngc-datatype="int"  :class="classObject(props)">
					 <input type="number"  :value="props.dataItem[props.field]"  min="0.0000" max="1000000000.0000" data-ngc-role="field" 
					data-ngc-validation="Number" data-ngc-datatype="number" v-on:change="setDataFields(props ,event)" ></div>
			</td>
			</template>	
				<template v-slot:moneyCell="{props}">
				<td>
					<div :data-item="props.field" v-if="props.rowType !== 'groupFooter'"  class="field "  data-ngc-datatype="money"  :class="classObject(props)">
					 <input type="number"   data-ngc-datatype="money"   :value="props.dataItem[props.field]"   min="0.0000" max="1000000000.0000" data-ngc-role="field" 
					data-ngc-validation="Number|Decimal|Money" step="0.0001" data-ngc-precision="4"  v-on:change="setDataFields(props ,event)" ></div>
			</td>
			</template>	
		     <grid-toolbar>
			<button  @click="copy(event)" class="k-button BtnLayoutIconText BtnIconCopy DoPost"><%=NGC.Language.LM.GetString("LBL_COPY")%></button>
			<div class="checkBox">
			<input type="checkbox" v-model="filterModifiedRow"  @change="showModifiedRows(event)"/><label id="label_showModifiedRow" for="showModifiedRow"><%=NGC.Language.LM.GetString("LBL_FILTER_MODIFIED_LINES")%></label>                 
			</div> 
			<div class="freezefields"><input type="number" id="freezedcolumns" name="freezedcolumns" v-model="freezeColumns"  min="0.0000" max="1000000000.0000" @change="updatefreezeColumns(event)"   data-ngc-validation="Number" step="any" data-ngc-precision="0" title="4" class="">
			</div>
			<div class="labelBox"><label id="label_freezefields" for="freezefieldscolumn"><%=NGC.Language.LM.GetString("LBL_FREEZE_COLUMNS")%></label></div>
			<div class="inputFilter customfilter ">
					<input id="filter_filterobj" name="filter_criteria" type="text"  v-model="searchWord"><input id="dashboarditems_clear" type="button" class="inputClearButton"  @click="searchClear()" value="Clear">
				</div>
			
			</grid-toolbar>
</kendo-grid>
		<input type="hidden" id="productionOrderIDJSON" runat="server" />
		<input type="hidden" id="quantityreasoncodes" runat="server" />
		<input type="hidden" id="condition" runat="server" />
		<input type="hidden" id="isrequirefactorycommentsvcr" runat="server" />
	</div>
	<script src="https://unpkg.com/@progress/kendo-vue-intl@2.7.3/dist/cdn/js/kendo-vue-intl.js"></script>
	<script src="https://unpkg.com/@progress/kendo-vue-grid@1.2.0/dist/cdn/js/kendo-vue-grid.js"></script>
	<script src="https://kendo.cdn.telerik.com/2021.1.119/js/kendo.all.min.js"></script>
	<script src="https://unpkg.com/@progress/kendo-vue-excel-export@1.2.0/dist/cdn/js/kendo-vue-excel-export.js"></script>
<NGC:SearchResults runat="server" ID="ngcsearchresult" />
</body>
</html>

This error is coming in the console

The main kendo script is referencing a youtube.api interface, this is the reason the control will not work in China. We will need help to get support from Telerik to see if it is possible to customize the main script by removing all references to "youtube", and also to find out if we can distribute the script under the licensing terms (we would have to include the script in our Web/scripts folder - not import from the Telerik source).

Please give me some guidance and help to resolve that issue

 

Filip
Telerik team
 answered on 06 Aug 2025
1 answer
34 views

First off: I know they are discontinued, not looking for support on them, this is a migration question

I'm investigating the possibility of migrating from vue2 to vue3 on our CMS, we have a bunch of vue2 kendoui vue2 wrapper widgets.

I have loaded the vue3 compat script and the widgets seem to still load (albeit with the warnings in the console).  But will the continue to work if I fully move to vue3 or do they only work in the context of vue2.

Filip
Telerik team
 answered on 01 Aug 2025
1 answer
33 views

I am using Vuejs 2.x.

I am trying to use the dropdowntree to display a large hierarchy.

I am also trying to use the ValueMapper to pre load the checked items.

The problem I have is that the valueMapper is not being called until I start clicking on nodes.

How to I get the valueMapper to check the correct nodes when the page is rendered?

Here is my code:


<body>
    <input id="dropdowntree">
<script>
  $(document).ready(function () {

    var localData = [
        { id: 1, text: "Parent 1", items: [
            { id: 2, text: "Child 1.1" },
            { id: 3, text: "Child 1.2" }
        ]},
        { id: 4, text: "Parent 2", items: [
            { id: 5, text: "Child 2.1" },
            { id: 6, text: "Child 2.2" }
        ]}
    ];
    
    
    var dropDownTree = $("#dropdowntree").kendoDropDownTree({
      placeholder: "Select an item...",
      dataSource: {  
        data: localData,
      schema: {
        model: {
            id: "id", 
            children: "items",
            fields: {
                id: { type: "number" },
                text: { type: "string" }
            }
        }
      }      
      },
      loadOnDemand: {
//THIS IS NOT CALLED UNTIL I START CLICKING NODES
        valueMapper: function (options) {
        var value = options.value;
        var item = localData.find(function (dataItem) {
            return dataItem.id == value;
        });
        options.success(item ? [item.id] : []);
        }
      },
      dataTextField: "text",
      dataValueField: "id",		
      //value: [2,5],    //SETTING THIS DID NOT HELP
      checkboxes: true, 
      checkAll: true,   
      autoClose: false
    });

    dropDownTree.value = [5]; // Trying to manually set value and call the valuemapper
  });
</script>
    
</body>

Vessy
Telerik team
 answered on 31 Jul 2025
1 answer
26 views

I am using Vue.js 2.x and Kendo controls.

Currently we are using the Kendo dropdowntree control to display hierarchy data.

Our control allows:

-1 or more items to be selected

-Also, once the data is saved, if the record is edited later, the dropdowntree will check each item that was previously checked.

-The properties we set in the dropdowntree:

      :data-source="items"
      tagMode="single"
      :autoClose="false"
      :checkboxes-check-children="checkChildren"
      :check-all="true"
      :placeholder="placeholder"
      dataTextField="text"
      dataValueField="id"
      @change="onChange"
      :value="selectedItems"
      style="width: 100%"
      height="400px"
      :load-on-demand="false"

 

 

The problem we have is that we have a scenario where a large hierarchy is being returned from the API with over 2000 rows.

This is causing the dropdowntree to take a long time to populate the control.

Is there a recommended way for the dropdowntree to handle large amounts of data?

Is there another control that can handle large amounts of data and display the data like the dropdowntree?

Is there another recommended way to display a hierarchy dropdown that acts like the dropdowntree?

 

Yanko
Telerik team
 answered on 30 Jul 2025
1 answer
28 views
Unless I'm mistaken, but I cannot customize the apperance of Button which have the properties: 'theme-color' and 'fill-mode'. 
In my case, I would like change the variable kendo-button-focus-shadow in the button : fill-mode (outline) and theme-color(primary). 
Yanko
Telerik team
 answered on 24 Jul 2025
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