Questions on Kendo UI for jQuery Forum

1 answer

138 views

BUG - checkbox appears incorrectly (used to work in earlier versions)

text should be above

Form

answered on 24 Jan 2023

2 answers

4.3K+ views

[Solved] How to set value for Dropdown properly?

Hi,

i have a dropdown. When the value is set in open event, the value is selected only for the first 16 items (depending on itemHeight in virtual). How do I get the value to always be selected and automatically scroll to the selected value? Below you'll find a running example.

Thanks for your help.

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Kendo UI Snippet</title>

    
    <link rel="stylesheet" href="https://kendo.cdn.telerik.com/2022.3.1109/styles/kendo.default-ocean-blue.min.css">
    
    <script src="https://code.jquery.com/jquery-1.12.4.min.js"></script>
    <script src="https://kendo.cdn.telerik.com/2022.3.1109/js/jszip.min.js"></script>
    <script src="https://kendo.cdn.telerik.com/2022.3.1109/js/kendo.all.min.js"></script>
</head>
<body>

    <div id="example">
        <div id="grid"></div>
    </div>
    <br>
    <br>
    <br>
  <div id="container">
    <input id="dropdownlist" style="width:300px" />
  </div>


  <script id="templateDDL" type="text/x-kendo-template">
    <span>
      <table>
        <tr class="combo-tr">
            <td class="combo-td">${id}</td>
            <td class="combo-td">${name}</td>
            <td class="combo-td">${description}</td>
        </tr>
    </table>
    </span>
  </script>


<script>
    const maxRecords = 10000;
    let data = [];
    
    class MyData{}  

    function generateData(){
        
        for (let i = 1; i <= maxRecords; i++) {
            let myData = new MyData();

            myData.id = i;
            myData.name = "name" + i;
            myData.description = "description" + i;
            
            data.push(myData);
        }   
    }
    
    generateData();

    $(document).ready(function(){
        $("#grid").kendoGrid({
            dataSource: {
                data: data,
                schema: {
                    model: {
                        fields: {
                            id: {type: "integer"},
                            name: { type: "string" },
                            description: { type: "string" }
                        }
                    }
                },
                pageSize: 25,
                serverPaging: false,
            },
            height: 600,
            sortable: true,
            filterable: true,
            selectable: true,
            pageable: {
                previousNext:   true,    
                numeric:        true,
                buttonCount: 3,
            },
            columns: [
                { field: "id", title: "ID", width: "130px" },    
                { field: "name", title: "Name", width: "130px" },
                { field: "description", title: "Description", width: "130px" }
            ],
            filterable: false,
            scrollable: {
                virtual: false
            },
            change: function(e) {
                        changeDdl();
            },
            dataBound: function(e) {
                this.select("tr:eq(0)");
                this.content.scrollTop(0);
            }
        });

        $("#dropdownlist").kendoDropDownList({
            optionLabel: "-- Please select something --",
            width:300,
            size:"small",
            dataSource: data,
            dataTextField: "name",
            dataValueField: "name",
            template: kendo.template($("#templateDDL").html()), 
            serverPaging: true,
            virtual: {
                itemHeight: 50,
                valueMapper: function(options) {
                    $.ajax({
                        dataSource: data,
                        type: "GET",
                        dataType: "json",
                        data: convertValues(options.value),
                        success: function (data) {
                            options.success(data);
                        }
                    })
                },
            },
            open: function(e){
                const ddl_element = $("#dropdownlist").data("kendoDropDownList");
                // read the current value of ddl (startValue), comes from SetDdlValue
                const startValue = ddl_element.text();
                    
                ddl_element.setDataSource(data);

                // looking for startValue in ddl-dataSource
                const itemEqualToStartValue = ddl_element.dataSource.data().find(x=>x.name === startValue);

                // set value of ddl_element, that is equal to the startValue
                ddl_element.value(itemEqualToStartValue.name);
                ddl_element.trigger("change");
            },
            change: function(e){
            }
        });

        
        // set the DDL value for the first time 
        const grid = $("#grid").data("kendoGrid");
        const selectedItem = grid.dataItem(grid.select());
        
        const ddl_element = $("#dropdownlist").data("kendoDropDownList"); 
        SetDdlValue(ddl_element, selectedItem);
        
        function convertValues(value) {
            let data = {};
            value = $.isArray(value) ? value : [value];
            
            for (let idx = 0; idx < value.length; idx++) {
                data["values[" + idx + "]"] = value[idx];
            }
            return data;
        }
          
        // gets called when change in grid is called
        function changeDdl(){
            const grid = $("#grid").data("kendoGrid");
            const selectedItem = grid.dataItem(grid.select());
            
            const ddl_element = $("#dropdownlist").data("kendoDropDownList"); 
            SetDdlValue(ddl_element, selectedItem);
        }        

        function SetDdlValue(ddl_element, ddl_value) {      
            let TempDDS = [];
            let TempJson = { "id": ddl_value.id, "name": ddl_value.name, "description": ""};
            TempDDS.push(TempJson);
            ddl_element.setDataSource(TempDDS);
            ddl_element.value(ddl_value.name);
            ddl_element.trigger("change");
        }
    });
</script>
</body>
</html>

DropDownList

answered on 24 Jan 2023

2 answers

147 views

Spreadsheet SAVE DATA CHANGES send fail - Status Code 502 error

hello.

url:
https://demos.telerik.com/kendo-ui/spreadsheet/datasource
I developed a program by applying this page and I am using it well.

However, if there is a lot of transmission data when trying "SAVE DATA CHANGES", an error occurs. It is not an error that occurs in the target url, but an error that cannot reach the target url itself.

All the data from the above url
vvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvv
If I change it to , and save it, I get an error.

method : get

Because it is a get, an error will occur.
On my site, I get an error even though I tried to post.

It's not even that the size of the data to be transferred is large.
Moreover, an error occurs even though it is not a get but a post.
The number of data passed is not large.
This is not an error occurring in the target url, but the transmission itself has failed.

What are the countermeasures? What are the alternatives?
It's not big data, but I get an error at "SAVE DATA CHANGES".
What could be the workaround?

please solve it thank you

Spreadsheet

answered on 24 Jan 2023

1 answer

251 views

Kendo Chart legend customization options

Hi,

I have been using kendo ui charts, and in one of pages I have fixed limited space for whole chart area (chart + legend).

Unfortunately, sometimes, dataset for this chart has a lot of elements (30-50) and legend is simply too big (regardless of position, it doesn't fit together with chart in designated space).

Is there a way to customize legend (to limit its area and have only that area with scrollbar (if I put it right or left), or can I load legend elements in dropdown, so it can be extended if needed?

Any suggestions how to handle this?

Thank you

Regards,

Vedad

Charts

answered on 19 Jan 2023

1 answer

266 views

[Solved] How to improve ListBox performance?

Hello,

I have strong performance problems with the ListBox when working with 10,000+ records. On the one hand, it takes a very long to display the data, on the other hand, the search takes a very long time if you have a lot of hits. It also takes a very long time to delete the searched word. Drag and drop is also very slow. Is there any way to improve the performance? The version I am using is from late 2020!

For example, when searching for "name5" it takes a long time to display the results, when deleting "name5" from the search box the performance is also poor.
Here I use only 2 listboxes, in my project I need 3, which makes the performance even worse.

Just for your information, I actually do not generate the data locally it's just for this example to generate enough datasets.

Thanks for your help.

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <link rel="stylesheet" href="https://kendo.cdn.telerik.com/2022.3.1109/styles/kendo.default-ocean-blue.min.css">
    
    <script src="https://code.jquery.com/jquery-1.12.4.min.js"></script>
    <script src="https://kendo.cdn.telerik.com/2022.3.1109/js/jszip.min.js"></script>
    <script src="https://kendo.cdn.telerik.com/2022.3.1109/js/kendo.all.min.js"></script>

    <title>Kendo Listbox</title>
</head>
<body>
    <script id="listbox_template" type="text/kendo-x-tmpl">                                          
        <div>                                                                                         
            <table class="listbox_trueberschrift" style="width:100%;">                                 
                <colgroup>                                                                            
                    <col style="width:140px;">                                                         
                    <col style="width:180px;">                                                         
                </colgroup>                                                                            
                <tr style="display:none;">                                                            
                    <td class="listbox_tdueberschrift" nowrap>Code</td>                                
                    <td class="listbox_tdueberschrift" nowrap>Beschreibung</td>                        
                </tr>                                                                                  
                <tr>                                                                                   
                    <td nowrap>#:OrderID#</td>                                                         
                    <td nowrap>#:ShipName#</td>                                                         
                </tr>                                                                                  
            </table>                                                                                   
        </div>                                                                                         
    </script>

    <div id="example" role="application">
        <div class="demo-section wide">
            <input type='text' id='searchBox' class='k-input k-textbox k-input-solid k-input-md k-rounded-md' placeholder='Suchen' />
        <div>
            <select id="listbox1"></select>
            <select id="listbox2"></select>
        </div>
    </div>
        <script>
            const maxRecords = 10000;
            let dataSource2 = [];
            let dataSource3 = [];
            
            class MyData{}

            function generateData(){
                for (let i = 1; i <= maxRecords; i++) {
                    let myData = new MyData();

                    myData.OrderID = i;
                    myData.ShipName = "ShipName" + i;
                    
                    if(i <= 5000) dataSource2.push(myData);
                    else dataSource3.push(myData);
                } 
            };

            generateData();
            
            $(document).ready(function () {
                $("#searchBox").on("input",function(e) {
                    var listBox1 = $("#listbox1").getKendoListBox();
                    var listBox2 = $("#listbox2").getKendoListBox();
                    var sarchString = $(this).val();

                    listBox1.dataSource.filter({ field: "ShipName", operator: "contains", value: sarchString });
                    listBox2.dataSource.filter({ field: "ShipName", operator: "contains", value: sarchString });
                });

                $("#listbox1").kendoListBox({
                    connectWith: "test",
                    draggable: true,
                    dropSources: ["listbox2"],
                    selectable: "multiple",
                    dataSource: dataSource2,
                    dataTextField: "ShipName",
                    dataValueField: "OrderID",
                    template: kendo.template($("#listbox_template").html()),
                    toolbar: {
                        tools: ["moveUp", "moveDown", "transferTo", "transferFrom", "transferAllTo", "transferAllFrom", "remove"]
                    }                                                                                    
                });
                
                $("#listbox2").kendoListBox({
                    draggable: true,
                    dropSources: ["listbox1"],
                    dataSource: dataSource3,
                    selectable: "multiple",
                    dataTextField: "ShipName",
                    dataValueField: "OrderID",
                    template: kendo.template($("#listbox_template").html()),
                });
            });
        </script>
    </div>
    
    <style>
        .demo-section label {
            margin-bottom: 5px;
            font-weight: bold;
            display: inline-block;
        }
    
        #example .demo-section {
            max-width: none;
            width: 600px;
        }
    
        #example .k-listbox {
            width: 236px;
            height: 350px;
        }
    
        #example .k-listbox:first-of-type {
            width: 270px;
            margin-right: 1px;
        }
    </style>
</body>
</html>

ListBox

answered on 19 Jan 2023

2 answers

1.4K+ views

[Solved] How do I hide menu Items?

Hi,

The menu widget has an 'enable()' function, is there a similar way to hide a menu item the same way?

Thanks,
Grant

Menu

updated answer on 18 Jan 2023

0 answers

158 views

Unable to save and load shape connectors with custom positions

Hello,

I'm trying to combine custom positions of shape connectors with the save and load functionality. I've combined the following two examples in the dojo:

https://docs.telerik.com/kendo-ui/api/javascript/dataviz/ui/diagram/configuration/shapes.connectors.position

https://docs.telerik.com/kendo-ui/api/javascript/dataviz/ui/diagram/methods/load

Dojo example: https://dojo.telerik.com/oqAloqOY/2

As you can see after loading the saved model the custom connectors are gone. Is there any way to persist them or at least re-apply them after load?

Thanks

Diagram

asked on 17 Jan 2023

1 answer

459 views

Does KendoMultiSelect provide option to call a function during multiselect initialization?

I am trying to move away from using select2 multi-select. Ideally, I would like to call a function that returns the value for the kendo multi-select during initialization. The value will be retrieved by an AJAX call. Is there any way I could implement this? I tried using dataBound, but it looks like anything inside the data-bound will be called every time user clicks on the multi-select control.

During initialization, I don't want to call the dataSource. This will be updated every time user clicks open. I just need to update the value field based on the AJAX result.

$("#multiselect").kendoMultiSelect({
  dataSource: {
    transport: {
      read: {
        url: "https://demos.telerik.com/kendo-ui/service/products",
        dataType: "jsonp"
      }
    }
  },
  open: function(e){
    // datasource is dynamic and should be updated with every click.
    $('#multiselect').data('kendoMultiSelect').dataSource.read();
  },
  dataTextField: "ProductName",
  dataValueField: "ProductID",
  autoBind: false,
  value: "IS IT POSSIBLE TO GET DATA FROM AJAX DURING INITIALIZATION?"
});

Is this possible with telerik multiselect?

MultiSelect

answered on 17 Jan 2023

1 answer

149 views

ScrollView autoBind not documented

The documentation for ScrollView autoBind is incorrect or incomplete. When examining the ScrollView autoBind API Reference the sample configuration does not mention or show proper usage of the autoBind configuration. Additionally, I am unable to get the ScrollView widget to initialize when setting autoBind: false

When using this configuration the widget does not initialize. If I set autoBind: true the widget binds to the dataSource but it does not honor the current query parameters.

This code runs correctly when autoBind: true. It fails when autoBind: false Dojo Snippet

<script id="scrollview-template" type="text/x-kendo-template">
    <div style="width: 200px; height: 200px; background-image: #=setBackground(data.filename)#; background-repeat:no-repeat; background-size: cover;"></div>
    <p>#= data.filename #</p>
</script>


<div id="container" style="margin: 20px;">
    <div id="scrollView"
      data-role="scrollview" 
      data-auto-bind="false"
      data-pageable="true"
      data-enable-pager="true"
      data-template="scrollview-template"
      data-bind="source: fruits"
      data-content-height="100%" 
      data-page="0"
      style="width: 400px; height: 300px; max-width: 100%;">
    </div>
</div>



<script>

function setBackground(filename) {
  return "url(https://demos.telerik.com/kendo-ui/content/shared/images/photos/" + filename + ")";
}

var viewModel = kendo.observable({
  fruits: new kendo.data.DataSource({
    data: [
      { filename: "15.jpg" },
      { filename: "16.jpg" },
      { filename: "17.jpg" }
    ],
    schema: {
      model: {
        fields: {
          filenname: { type: "string" }
        }
      }
    }
  })
});

$(document).ready(function() {
  kendo.bind($("#container"), viewModel);

  

  setTimeout(function(){
    console.log("ScrollView Next - Refresh");
    //var scrollView = $("#scrollView").kendoScrollView().data().kendoScrollView;
    //scrollView.scrollTo(1);
    //scrollView.refresh();
    }, 1000);
  });


</script>