Questions on Kendo UI for jQuery Forum

1 answer

233 views

Dropdownlist setDataSource callback function needed

I have a kendo dropdownlist with virtualization and a local array of objects used as the data source. I need to replace the datasource based on selections the user makes elsewhere on the page. The problem I'm having is that since it uses virtualization, I don't know when the datasource has finished being updated with setDataSource(newDataSource) and as such, sometimes when I try to set the new value, the new value isn't there. I don't want to use setTimeout because that is bad practice as it assumes it will take a certain amount of time to complete. The cascade event seems to only work after changing the value, not the dataSource. Is there a way to do something like this reliably:

var newDataSourcce = getDataSource();
myDropdownList.setDataSource(newDataSource);
myDropdownList.value(100);

I can't make a dojo because the JSON object used as a datasource is too large and using a smaller array doesn't trigger the issue. Also note the getDataSource() is a function that filters the JSON object based on the other selections a user made (e.g. department: food, type: fruit, color: red; limits the list to red fruits).

DropDownList

answered on 25 Aug 2023

1 answer

93 views

Kendo UI for jQuery Scatter Charts Overview

Is possible store to database when click the chart and then showing them on chart ?

Charts

answered on 25 Aug 2023

1 answer

392 views

Content Security Policy stopping the execution of Kendo Controls (.net MVC, Razor, Jquery)

After Implmenting the Content Security Policy (CSP) in our application, various Kendo controls have stopped working. The CSP, blocks execution of inline scripts and since the Kendo controls are creating scripts while they render, CSP finds it as a threat and hence blocks its execution.

Below is a snapshot of the browser console error. All of the 5 errors are being thrown by kendo Controls.

When the Kendo Control, such as a grid, is rendered, a script tag is generated. Please check the below screenshot for reference.

Here, we have a grid, divIFAResults, when it is rendered on the screen, a script tag with Kendo.syncReady() is generated. The Kendo Grid relies on this script for its smooth execution, but our CSP blocks this script, inturn making the control unusable.

We have added 'unsafe-eval' as per the telerik docs for CSP. We are using the Kendo files hosted in our own project, not from CDN.

Accessibility

DropDownList

Grid

answered on 25 Aug 2023

1 answer

126 views

Kendo line chart error bars, toggle on hoverover

http://dojo.telerik.com/aGisuSuR/2

I am trying to hide and show error bar on a Kendo line chart based on when the mouse is over the line point, is it possible to do this? I tried using highlight, I can probably create a visual, but I just wanted to hide all the error bars and show only when the point is highlighted. I tried to set erroBar visibility false and set it to true on Highlight, that doesn't seem to work. Even if this worked, this would set the visibility of all error bars?, I just want to set it for only one point at a time, as showing all at once is will overlap error bars.

<!DOCTYPE html>
<html>
<head>
    <base href="http://demos.telerik.com/kendo-ui/line-charts/remote-data-binding">
    <style>html { font-size: 14px; font-family: Arial, Helvetica, sans-serif; }</style>
    <title></title>
    <link rel="stylesheet" href="https://kendo.cdn.telerik.com/2017.1.118/styles/kendo.common.min.css" />
    <link rel="stylesheet" href="https://kendo.cdn.telerik.com/2017.1.118/styles/kendo.default.min.css" />
    <link rel="stylesheet" href="https://kendo.cdn.telerik.com/2017.1.118/styles/kendo.default.mobile.min.css" />

    <script src="https://kendo.cdn.telerik.com/2017.1.118/js/jquery.min.js"></script>
    <script src="https://kendo.cdn.telerik.com/2017.1.118/js/kendo.all.min.js"></script>
</head>
<body>
<div id="example">
    <div class="demo-section k-content wide">
        <div id="chart"></div>
    </div>
    <script>
        function createChart() {
           var StrokeAnimation = kendo.drawing.Animation.extend({
             init: function(element) {
               kendo.drawing.Animation.fn.init.call(this);
               this.initialStroke = $.extend({}, element.options.stroke);
               this.color = element.options.fill.color;
               this.element = element;
              
             },
             step: function(pos) {
               this.element.stroke(this.color, this.initialStroke.width * pos * 5, 0.5);
             },
             
             reset: function() {
               this.element.options.set("stroke", this.initialStroke);
             }
           });
            $("#chart").kendoChart({
                dataSource: [
    {
        "country": "Spain",
        "year": "2008",
        "unit": "GWh",
        "solar": 2578,
        "hydro": 26112,
        "wind": 32203,
        "nuclear": 58973,
    "low":51000,
    "high":68000
    },
    {
        "country": "Spain",
        "year": "2007",
        "unit": "GWh",
        "solar": 508,
        "hydro": 30522,
        "wind": 27568,
        "nuclear": 55103,
     "low":52000,
    "high":60000
    },
    
],
                title: {
                    text: "Spain electricity production (GWh)"
                },
                legend: {
                    position: "top"
                },
                seriesDefaults: {
                    type: "line",
                    errorLowField: "low",
                    errorHighField: "high",
                    errorBars: {
                      highlight:{
                      line: {
                        width: 1,
                        dashType: "solid"
                       }
                      },
                    
                    visible: true,
                    endCaps: true,
                    width: 10,
                    color: "darkblue",
                    line: {
                        width: 1,
                        dashType: "solid"
                       }
                   },
                    highlight: {
                      errorBars: {
                        line: {
                          width: 1,
                          dashType: "solid"
                         }
                      }
                    }
                },
                series: [{
                    field: "nuclear",
                    name: "Nuclear"
                }, {
                    field: "hydro",
                    name: "Hydro"
                }, {
                    field: "wind",
                    name: "Wind"
                }],
                categoryAxis: {
                    field: "year",
                    labels: {
                        rotation: -90
                    },
                    crosshair: {
                        visible: false
                    }
                },
                valueAxis: {
                    labels: {
                        format: "N0"
                    },
                    majorUnit: 10000
                },
                tooltip: {
                    visible: false,
                    shared: false,
                    format: "N0"
                },
               
               render: function(e) {
                
                }
              
            });
        }

        $(document).ready(createChart);
        $(document).bind("kendo:skinChange", createChart);
    </script>
</div>


</body>
</html>

Charts

answered on 24 Aug 2023

1 answer

393 views

Best Practice to Clone DatePicker/DateTimePicker

As the subject says, I'm looking for the recommended way to clone existing DateTimePicker controls at run time so that users can create as many controls as are necessary.

Our application allows users to clone rows of data that contain both DatePickers and DateTimePickers. We recently upgraded from a previous version of Kendo UI to 2022.3.1109 and now the code that used to work does not.

If we don't execute the following, the look and feel is correct (but nothing happens when either the date or time controls are clicked):

If we do execute the above, the control appears as shown in the second row below...

...and the following error appears in the console:

I am able to create cloned fields if I write the appropriate HTML from scratch (e.g., embed a constant in the JavaScript function), but there's other logic that's fired that we need to take care of so that's not optimal.

I've also tried getting the options from the original control and applying them to the cloned control, but that also doesn't work, nor does attempting to destroy the control via $("#controlName").data("kendoDateTimePicker").destroy(). (My guess is that the underlying Kendo logic doesn't know about the cloned controls so the calls fail.)

Any help on what the best practice is would be greatly appreciated!

Date/Time Pickers

answered on 24 Aug 2023

1 answer

204 views

Saving grids or charts as PDF and getting strange characters in the MetaData

Hi,

I'm doing a quite simple implementation of saveAsPdf() for a grid. The actual PDF is fine, but the MetaData is a problem.

The PDF MetaData attributes for title, subject, keywords, author, creator and producer all contain strange/escape characters.

Here is an example of what I get every time.

Title: Ã¾Ã¿�M�o�d�e�l� �2�0�2�3
Subject: Ã¾Ã¿
Keywords: Ã¾Ã¿
Author: Ã¾Ã¿
Creator: Ã¾Ã¿�K�e�n�d�o� �U�I� �P�D�F� �G�e�n�e�r�a�t�o�r
Producer: Ã¾Ã¿�K�e�n�d�o� �U�I� �P�D�F� �G�e�n�e�r�a�t�o�r

The only one of these attributes I'm actually setting is the Title. The rest are just whatever is deemed a default value (I assume).

This happens when I produce the PDF from Chrome, Firefox or Edge.

Here's an example of the PDF Options I am using.

{
    "title": "Model 2023",
    "fileName": "Model2023.pdf",
    "allPages": false,
    "avoidLinks": true,
    "paperSize": "A4",
    "margin": {
        "left": "1cm",
        "top": "1cm",
        "right": "1cm",
        "bottom": "1cm"
    },
    "scale": 0.4,
    "landscape": true,
    "multiPage": true,
    "repeatHeaders": true
}

I have tried multiPage as true and false, which made no difference. I have included pako_deflate. I thought it might be a font issue, but it's MetaData. Not what's actually output on the PDF.

To make it even more confusing for me, your demo works perfectly. :)

FYI: Using version: 2022.3.913

If you can offer any ideas, I'd be grateful.

Thanks
John

Grid

PDFViewer

answered on 24 Aug 2023

1 answer

311 views

Subresource Integrity when using the CDN

Hi,

I would like to implement the subresource integrity check on the scripts and stylesheets which are brought in from the Kendo CDN. However I wanted to check something first. I have added the scripts based on this guide https://docs.telerik.com/kendo-ui/intro/installation/cdn-service. However there are no integrity hashes for the files. Are these available anywhere? If not I can generate them from the files manually, but this won't work if the scripts are ever modified.

Are the scripts ever changed once deployed in a version? Does every server in the CDN deliver always the exact same bytes for the file?

Many thanks,

Bill

General Discussions

answered on 24 Aug 2023

3 answers

147 views

Kendo charts not shown not working in jsp page

Charts is not shown on JSP Page..Empty div is shown.why????

<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
    pageEncoding="ISO-8859-1"%>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%>
   <%@ taglib prefix="kendo" uri="http://www.kendoui.com/jsp/tags"%>
<%@page isELIgnored="false"%>
<!DOCTYPE html>
<html>
<head>
    <link href="resources/styles/kendo.default-main.css" rel="stylesheet" type="text/css" />
     <link href="resources/styles/kendo.common-min.css" rel="stylesheet" type="text/css" />
      <link href="resources/styles/bootstrap-main.css" rel="stylesheet" type="text/css" />
      
    <script src="resources/js/jquery.min.js"></script>
    <script src="resources/js/kendo.web.min.js"></script>
<meta charset="ISO-8859-1">
<title>Kando Charts Example</title>
</head>
<body>
<h2>Charts</h2>
    

    <div id="chart">hello</div>
    <script>
      $("#chart").kendoChart({
        title: {
          text: "Gross domestic product growth /GDP annual %/"
        },
        legend: {
          position: "top"
        },
        series: [{
          name: "India",
          type: "column",
          data: [3.907, 7.943, 7.848, 9.284, 9.263, 9.801, 3.890, 8.238, 9.552, 6.855],
          color: "red"
        },{
          name: "Germany",
          type: "column",
          data: [1.010, 1.375, 1.161, 1.684, 3.7, 3.269, 1.083, 5.127, 3.690, 2.995],
          color: "blue"
        },{
          name: "World",
          type: "line",
          data: [1.988, 2.733, 3.994, 3.464, 4.001, 3.939, 1.333, 2.245, 4.339, 2.727],
          color: "green"
        }],
        categoryAxis: {
          categories: [2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011]
        },
        valueAxis: {
          labels: {
            format: "{0}%"
          }
        },
        tooltip: {
          visible: true,
          template: "#= series.name #: #= value #%"
        }
      });
    </script>
</body>
</html>

Charts

answered on 23 Aug 2023

1 answer

162 views

I want to know how to limit the number of checkboxes per row in the CheckBoxGroup function.

(Before getting into the article, I apologize for my poor English skills.)

Hello! you guys always help me.

I need to create checkboxes using kendoCheckBoxGroup function in specific fields of KendoForm.

However, it should be limited to 4 per line, not listed in one line.

Expressing it pictorially is as follows:

(Note, the text that goes into the field will vary in length.)

And, the code I'm working on is below.

var items = [
        {value: "item1", label: "Item 1"},
        {value: "item2", label: "Item 2"},
        {value: "item3", label: "Item 3"},
        ...
        {value: "item14", label: "Item 14"},
    ];

$('#checkBoxField').kendoCheckBoxGroup({
    items: items,
    layout: "horizontal"
});

How can I modify it to make it work the way I want?

Thank you as always for your kindness!

answered on 22 Aug 2023

1 answer

507 views

Default Font Select Value Instead Of "inherited font".

I'm using the kendo editor tool for a rich text editor, and I want to change the default font family. No matter what I do (I've tried accessing the HTML element by jQuery and DOM selectors and change its value), the selected font stays "inherited font" option, what should I do? (Same goes for "inherited size", for the font size)

DropDownList

Toolbar

answered on 21 Aug 2023