Questions on UI for ASP.NET MVC Forum

6 answers

522 views

Error when selecting item using javascript when component has a valuemapper

Hi,

I've recently found an issue with the combobox where a user can type in any number on the combobox and it will save if the foreign key exists on the database - regardless of checking whether or not the value is valid for use or not.

Why does the combobox treat typing in a random number as the FK of the control anyway when it doesn't do the same thing if you type in a random character?

Anyway the above is a question for a different time but after finding this out, I've found there's an article on how to avoid these kind of situations using JavaScript on this page:

https://docs.telerik.com/kendo-ui/knowledge-base/prevent-submission-of-missing-value

While trying to implement this logic, I can see that it's working (by not allowing the random number selection to be saved), but I've noticed there's actually an error on the first round of "select" call as the loading icon is displayed on the combo box.

The specific line is the "this.select(0)" line from the code snippet below:

if (this.value() && this.selectedIndex == -1) {

this.dataSource.filter({

value: this.value(),

field: this.options.dataTextField,

operator: "contains"

});

this.select(0); <=== this line is causing the issue.

if ( this.selectedIndex == -1 ) {

this.text("");

}

Upon closer inspection, I see that there's a 500 error being thrown due to the "Page" parameter being set to NaN and the "PageSize" parameter being set to 0.

https://.../Items?sort=&group=&filter=NameDisplay~contains~%2712%27&page=NaN&pageSize=0

Any subsequent searches works without any issues and sets the "Page" and "PageSize" to the correct values.

https://.../Items?sort=&page=1&pageSize=80&group=&filter=NameDisplay~contains~%2712%27

This is very strange as the 500 error (above) only displays the first time this.select(0) is called, but any subsequent times will work without any issues.

While trying to reproduce this, I've found that it only occurs when the combobox has a valuemapper set to it.

.Virtual(v => v.ItemHeight(26).ValueMapper("itemsValueMapper"))

When the valuemapper function is removed from the combobox, the this.select(0) functions runs without any issues.

The value mapper is required for my comboboxes as it provides a good way to virtualise my lists.

My datasource is using webapi as below:

.DataSource(source =>

{

source.Custom()

.ServerFiltering(true)

.ServerPaging(true)

.PageSize(80)

.Type("webapi")

.Transport(transport =>

{

transport.Read(a => a.Url(itemsUrl));

})

.Schema(schema =>

{

schema.Data("Data")

.Total("Total");

});

})

Is there any work around that can be done for this?

Or even better, is there a way to prevent the combobox from binding random number values typed into the control?

ComboBox

answered on 13 Jul 2020

1 answer

267 views

Always show collapse icon after clicked on expand

Hi All,

I have a requirement to show collapse icon (after clicking the expand icon) whether it has a child nodes or not.

Thanks

TreeView

answered on 13 Jul 2020

9 answers

1.2K+ views

[Solved] Load Kendo scripts on bottom of page - possible?

Hi, we always load all js files at the bottom of a page because of performance. Before the </body> closing tag.
If we shift the JS files from head to the end of the file, Kendo controls are not working.
All the JS files are loaded correct if we check the network traffic with firebug tool.

Is it an known issue? and we have always to load all the scripts in head?

I made a 2nd quick test with the keno example code.
Open kendoui.trial.2012.3.1114\wrappers\aspnetmvc\Examples\Areas\razor\Views\Shared\_WebLayout.cshtml and shifted the following scripts to the bottom. Than load e.g. the datepicker example page (http://localhost/kendo/razor/web/datepicker/index)

    <script src="@Url.Content("~/Scripts/jquery.min.js")"></script>
    <script src="@Url.Content("~/Scripts/kendo.web.min.js")"></script>
    <script src="@Url.Content("~/Scripts/kendo.aspnetmvc.min.js")"></script>
    <script src="@Url.Content("~/Scripts/console.min.js")"></script>
    <script src="@Url.Content("~/Scripts/prettify.min.js")"></script>

Same problem. If I open the datepicker test page. Datepicker is not working.
Thanks for your help.
Regards fan

General Discussions

answered on 09 Jul 2020

3 answers

374 views

[Solved] Bug? Use PersistSelection with GroupPaging

Hi everyone,

not sure if I found a bug or if i'm just doing it wrong.

What I try is to create a grid that is per default grouped with GroupPaging and has a checkbox selection column with PersistSelection.

However I only get a js error "Cannot read property 'undefined' of undefined" @init._restoreSelection (kendo.all.min.js:62).

I tried adding an Id field but it still doesn't work. Only changed error to "Cannot read property 'Id' of undefined".

If I remove the PersistSelection it works fine.

Html.Kendo().Grid<MyViewModel>()

.Name("myGrid")

.Columns(c =>

{

c.Select().Width(50);

c.Bound(x => x.Id).Hidden();

c.Bound(x => x.ArticleNo);

c.Bound(x => x.ArticleGroup).ClientGroupHeaderTemplate("<input class=\"k-checkbox groupSelect\" type=\"checkbox\"> #= value #").Hidden();

})

.PersistSelection()

.ToolBar(t => t.Search().Text(Localizer.Lang_SearchInTable))

.Events(x => x.DataBound("eventMyGridDataBound"))

.DataSource(dataSource => dataSource

.Ajax()

.PageSize(50)

.GroupPaging(true)

.Group(x => x.Add(y => y.ArticleGroup))

.Read("GridRead", "Article")

.Model(m =>

{

m.Id(f => f.Id);

m.Field(f => f.ArticleNo);

m.Field(f => f.ArticleGroup);

}))

Best Regards

Nils

Grid

answered on 08 Jul 2020

8 answers

1.5K+ views

Grid: Insert and Delete only, no update of existing records

Hi,

I'm using the Kendo Grid in my application.

In my Grid I just need to insert rows and delete them. Update should not be possible.

If I define the Grid as follows, I dont have an update button to save the values. If I specify the Update function, I get the Update Button.

How can I achieve this?

Greets

.Columns(

col =>

{

col.Command(c => { c.Destroy(); }).Width(250);

...

})

.ToolBar(c => c.Create())

Grid

answered on 07 Jul 2020

1 answer

2.5K+ views

Kendo Grid Batch Edit with all rows and columns editable

Hello,

We have a business requirement where the rows in the grid should all be in editable mode, i.e. show textbox or dropdown etc for each of the columns for each row.

The default implementation only shows a textbox in the field that a user is editing, the others display as labels.

When we tried with custom templates, it seems it does not support 2-way model databinding.

Please advise.

Thanks.

Grid

answered on 06 Jul 2020

5 answers

191 views

Server Grouping with virtualisation

Hello All, I followed this example https://demos.telerik.com/aspnet-mvc/grid/server-grouppaging-virtualization to implement in my project, however i am getting error while doing grouping with mutiple columns, i tried searching in the forms for a solution but no luck.

This is my Code below

Html.Kendo().Grid<Project.ViewModels.ListViewModel>()

.Name("GridName")

.Columns(columns =>

{

columns.Select().Width(50).HtmlAttributes(new { @class = "checkbox-align" }).HeaderHtmlAttributes(new { @class = "checkbox-align" });

columns.Bound(p => p.Company);

columns.Bound(p => p.Country);

columns.Bound(p => p.City);

columns.Bound(p => p.CodeSociete);

})

.ToolBar(toolbar =>

{

toolbar.Create();

})

.ColumnMenu(col => col.Filterable(true))

.Height(550)

.Sortable(sortable=>sortable.Enabled(true))

.Navigatable()

.Resizable(r => r.Columns(true))

.Groupable()

.Filterable(filterable => filterable

.Enabled(true)

.Extra(true)

.Operators(operators => operators

.ForString(str => str.Clear()

.StartsWith("Starts with")

.IsEqualTo("Is equal to")

.IsNotEqualTo("Is not equal to")

))

)

.Scrollable(scrollable => scrollable.Virtual(true))

.Events(events => events.DataBound("onDataBound"))

.DataSource(dataSource => dataSource

.Ajax()

.Events(events =>

events.Error("error_handler")

)

.Model(model =>

{

model.Id(p => p.ID);

})

.GroupPaging(true)

.PageSize(50)

.Read("DetailProducts_Read", "List")

)

My Controller class ListController.cs

[HttpPost]

public ActionResult DetailProducts_Read([DataSourceRequest]DataSourceRequest request)

{

IEnumerable<List_Entity> list = myService.getAll(out totalRecords, this.UserId.ToString());

listDB = list

.Select(f => new ListViewModel()

{

ID = f.ID,

Company= f.Company,

Country= f.Country,

City= f.City,

CodeSociete= f.CodeSociete



,

}).ToList();

DataSourceResult result = listDB.ToDataSourceResult(request);

result.Total = (int)totalRecords;

return new JsonResult() { Data = result, JsonRequestBehavior = JsonRequestBehavior.AllowGet, MaxJsonLength = Int32.MaxValue };

}

When i run the application virtualisation,sorting,filtering,paging works perfectly without grouping, when i try to group with first colum drag and drop all the events work perfectly, but when i try to drag second column to grouping i get the following error (errorDebug.png) and in the browser console window i have this error

Uncaught TypeError: Cannot read property 'length' of undefined
at Function.map (jquery-1.10.2.js:789)
at init.groups (kendo.aspnetmvc.js:212)
at proxy (jquery-1.10.2.js:841)
at init.groups (kendo.all.js:6508)
at init._readData (kendo.all.js:7371)
at init.success (kendo.all.js:7575)
at success (kendo.all.js:7527)
at Object.n.success (kendo.all.js:6404)
at fire (jquery-1.10.2.js:3062)
at Object.fireWith [as resolveWith] (jquery-1.10.2.js:3174)

Could you please help me to resolve this issue?

Grid

answered on 06 Jul 2020

3 answers

1.3K+ views

Force Kendo grid to display horizontal scrolling bar even if there is no data to display

Hello All,

I have a Kendo grid where all of its columns do not fit into the grid width.

If there is a least one row of data to display the grid shows a horizontal scrolling bar.

However if there is no data, there is no horizontal scrolling bar. Even though it is a cosmetic issue and it happens when there is nothing to display, some of my users complain and want to have horizontal scrolling bar displayed.

Is there any way to get this done?

Thank you!

Grid

answered on 03 Jul 2020

1 answer

482 views

FileManager Breadcrumb folder links just go to "#"

The FileManager breadcrumb links for previous folders don't seem to work like I would expect. Instead of opening the folder that was clicked on, it appears that the breadcrumb link leads to "#". Clicking on the root folder icon seems to work correctly (opens the root folder) but folder links don't seem to work out of the box.

Is there some kind of configuration that I'm missing?

FileManager

answered on 03 Jul 2020

1 answer

365 views

Tables: Can I have something other than non-blank white space ( ) character as default content of table cells?

As per subject. When a new table is created, all cells contain a non-blank white space HTML character ( ). Is there any way to initialize the control so that it contains nothing, zip, nada?

Editor

answered on 02 Jul 2020