Questions on Kendo UI for jQuery Forum

12 answers

2.3K+ views

Best way to draw chart with dynamically changing data?

Hello,

We're evaluating tools for drawing data that will be dynamically changing (streams of data being pushed to the client). We tried setting up a page using the Kendo UI Graph. The data renders and updates, but the redraw is noticeably slow and flickers. We're currently calling the refresh() method on the chart to redraw after we append new values to the data source. Is there are more efficient method for redrawing streaming data or some parameters that affect the redraw behavior that I haven't been able to locate? For comparison, the Flot library for jQuery is noticeably smooth when rendering.

Thank you.

Charts

answered on 09 Jan 2014

1 answer

103 views

ValueTemplate property missing

I've tried to add a custom ValueTemplate to my DropDownList like it is described in the Kendo demo-section "Customizing Templates" -
http://demos.kendoui.com/web/dropdownlist/template.html

It seems that in the current release 2013.3.1119.340 the DropDownList-property ValueTemplate is missing. How do I accomplish a custom valueTemplate without this property? I'm using MVC Razor.

DropDownList

answered on 09 Jan 2014

6 answers

241 views

Kendo chart does not handle very small values

see fiddle http://jsfiddle.net/A2URt/

the kendo chart does not seem to handle very small values well. We included two examples one with very small values, the other one with a bit larger values. The edge case seems to lie in values 1.0e-7.

Can somebody help, explain etc?

Kind regards Dennis

Charts

answered on 09 Jan 2014

4 answers

358 views

Cancel checkbox parent click

Hello,
I have a need to cancel a checkbox check if the user has reached a limit. Unfortunately, simply calling preventDefault isn't working when the checked item is a parent. So I whipped up a little jQuery to handle this for me --

$("#treeview").on("click", ":checkbox", function (e) {

var treeView = $("#treeview").data("kendoTreeView");

origChecked = listChecked;

listChecked = [];

checkedNodeIds(treeView.dataSource.view(), listChecked);

if (searchLimited && listChecked.length > searchLimit) {

var newChecked = $(listChecked).not(origChecked).get();

$.each(newChecked, function (index, value) {

var item = treeView.dataSource.get(value);

item.set("checked", false);

});

e.preventDefault();

listChecked = origChecked;

}

});

// function that gathers IDs of checked nodes

function checkedNodeIds(nodes, checkedNodes) {

for (var i = 0; i < nodes.length; i++) {

if (nodes[i].checked) {

if (nodes[i].id != "0") {

checkedNodes.push(nodes[i].id);

}

if (nodes[i].hasChildren) {

checkedNodeIds(nodes[i].children.view(), checkedNodes);

}

I can see this works fine. If I put a breakpoint at the end, the treeview looks perfect. However, it appears that some other internal kendo event is firing after and resetting the items to a checked state. As I understood things, calling the set method should have been updating the underlying data for the treeview, so I didn't expect my changes to be overwritten... What am I missing?

Thanks,
Phil

TreeView

answered on 09 Jan 2014

4 answers

95 views

Build-in icons are not displayed when build the app in release mode

I am using the build-in icons all over my app which works fine when deploying the app in debug mode (build settings). But when I build the app in release mode non of the build-in icons is shown.

I am forcing the flat theme for the app.

General Discussions

answered on 09 Jan 2014

1 answer

139 views

Format number to IP number

Hi

I am trying to format number to IP format like 192.168.1.1 or 192.168.001.001

$("#ip4").kendoNumericTextBox({
format: "IP ###.###.###.###", /* works only if you input exact 12 numbers, works only if dot is thousand separator */
decimals: 0
});

This is not the right way!
I was searching kendo forum for text mask format but no luck. Does defining mask exists in kendo ?

Thx

By Ales

NumericTextBox

answered on 09 Jan 2014

2 answers

106 views

MVVM and Mobile Widget Initialization

Following the advice in several forum posts, along with this jsbin created by Alexander Valchev, I am investigating the use of an observable object that provides HTML content to be rendered:
jsbin.com/iyakig/2/edit
If I add a second button to the code in the jsbin like this:
makeButton: function () {
var html = '<a data-role="button" data-bind="click: makeListView">Replace again</a><a data-role="button" data-bind="click: makeListView">Replace yet again</a>';
this.set("foo", html);
},

The second button does not get initialized as a widget as you can see here:
jsbin.com/iyakig/31/edit
Is there a limitation on MVVM binding of HTML code?

We have been using kendo.mobile.init() to initialize all widgets in the HTML generated by a template, but we are looking to use MVVM binding as suggested in this post. We would be very interested in knowing why additional widgets are not initialized as well as the advantages to this approach vs. the kendo.mobile.init() approach.

General Discussions

answered on 09 Jan 2014

1 answer

64 views

Assistance with locating x,y values in chart

I was looking at the code of Kendo Chart to find out how the points (for line chart) are plotted from a single dataItem. While researching I found out that you are using a Box2D method from where you are creating a property which contains (x1,y1, x2, y2) and with this property you are plotting the points with there average values.

I was unable to found out that from where you are retrieving these values (x1,y1,x2,y2). If you can please show me the path (function) from where you are converting these values then it will help me to find a solution.

Thanks.

Charts

answered on 09 Jan 2014

1 answer

63 views

Show ticks in mobile site

Hello,
i tried to use kendo ui slider in a mobile site.

It seems to work ...

Is there anyway to show the ticks in a mobile site ?
It only can show the tickts on a desktop browser.

Regards

Jürgen

Slider

answered on 09 Jan 2014

3 answers

1.0K+ views

How do I prevent a new Grid row from being created if current row is not valid

I'm using a grid in an MVVM environment. The grid that starts out with now rows. Once the Add New Row button is clicked the grid adds a row but the user can keep clicking the button and add new rows without any validation on existing rows. How can I either disable the New Row button, perform validation on the current row before adding a new row or client side validate all rows before trying to update to the server. I don't care if a user wants to add several rows and then edit the columns before saving the changes back to the server but I need to validate all required fields first.

Grid

answered on 09 Jan 2014