Hi,

I am using kendo ui treeview for sort of selectable hierarchical menu. This menu can contain pretty much data with deep tree hierarchy.

Ever since we implemented it (few years ago), we used approach suggested here:
https://docs.telerik.com/kendo-ui/knowledge-base/filter-out-search-results

This was working fine so far. However, we finally started updating things to the newer versions, and after update to 2022.2.802 this method became 3-4 times slower than before.
For example same filtering method with exactly same dataset and the same search keyword has following values:

Before update:
measure filter 0.4153999999985099

After update:
measure filter 2.279300000000745

Even this piece of code gets slower

      if (data) {
        // Re-apply the filter on the children.
        dataSource.filter({ field: "hidden", operator: "neq", value: true });
      }

(same iteration)

Old:
measure dsFilter 0.001200000002980232

New:
measure dsFilter 0.013800000000745058

Unfortunately, we cannot update directly to the latest version to test if it is better. This is because of styling braking changes which we have to address and other constraints that we have. We have to do it gradually.

Could you please advise what to do, since depending on the dataset size, filtering can last more than 7-8 seconds, and reseting filtering even longer. This basically renders the feature unusable. 

Thank you very much.

Regards, Vedad

My dataSource change handler is getting an event with with e.action set to itemLoaded, which is not one of the defined values in the API documentation.

I am wondering if this is a valid event action that I can target and the documentation is not correct, or if this is something else like a bug.

Here is a dojo. If you run it and expand the item, in the browser console you will see a couple events, the last of which is the itemLoaded event.

Hi all,

I have a JSON tree with 3 levels of depth that I want to transform into a TreeView with checkboxes. This tree is sent by a server and the nodes contain certain metadata that will help me to format the output. More specifically, if a node has "isshop" to 1, or "isshop" is 0 but "_chn" is 1, then I have to include it. If the node is not a shop and has no children I should not output it.

The issue is that using templates the most I have been able to reach is having gaps in the view where the filtered nodes should have been without applying conditions. Here is my template:

<script id="tvCentrosTmpl" type="text/kendo-ui-template">
    # if (item.isshop == 1 || (item.isshop == 0 && item._chn)) { #
        <div class="spnNameCentro" data-idmodel="#:item.id#" data-uid="#:item.uid#" data-type="#:item.type#" data-isshop="#:item.isshop#">#:item.name#</div>
    # } #
</script>

And in the checkboxes definition I am using this:

template: function(data){
    if (data.item.isshop == 1 || (data.item.isshop == 0 && data.item._chn))
    {
        return '<input type="checkbox" class="chkParams" data-id="' + data.item.id + '" data-isshop="' + data.item.isshop + '" onclick="srcInhibMasivas.chkCenter_click(this);" />'
    }
    return '';
}

Here is an example output where "Z03" has no children and is not a shop:

Is there any way to leave the undesired nodes out without having to traverse and process the JSON client-side?

Thank you very much, best regards.

I was trying to implement Kendodropdowntree , I came across following situation which I am not able to understand

                $(dropdowntree).kendoDropDownTree({
                placeholder: "Select ...",
                height: "auto",
                dataSource:  //HARD CODED VALUE GOES HERE 
            });
       } 

Above example will work fine when , I hard code those datasource values. When I try to pass some variable there it will not work

var datatobind= somedata // data in exact format it is expected 
{
        
                $(dropdowntree).kendoDropDownTree({
                placeholder: "Select ...",
                height: "auto",
                dataSource:  datatobind
            });
       }

Even I tried passing variable of following type

var dataSourcetype = new kendo.data.HierarchicalDataSource({
        data: datatobind
    });

 
{
        
                $(dropdowntree).kendoDropDownTree({
                placeholder: "Select ...",
                height: "auto",
                dataSource:  dataSourcetype.options.data
            });
       }

But even above also doesn't solve problem, I am not able to get it , why passing exact same variable is not binding to data source.

Hey all I am trying to find the correct way to order/sort my child names in order from A-Z.

Currently my treeview looks like this:

And this is how I would like to sort it:

The data is coming in via JSON like so (using the above example):

[{
        "Name": "AU",
        "Description": null,
        "Id": "xxx",
        "DocumentType": null,
        "Category": "Academic",
        "Icon": null,
        "ProviderId": 2
    }, {
        "Name": "Gitlab",
        "Description": null,
        "Id": "xxx",
        "DocumentType": null,
        "Category": "Code Repos",
        "Icon": null,
        "ProviderId": 2
    }, {
        "Name": "B",
        "Description": null,
        "Id": "xxx",
        "DocumentType": null,
        "Category": "Dating",
        "Icon": null,
        "ProviderId": 2
    }, {
        "Name": "GitHubCommits",
        "Description": null,
        "Id": "xxx",
        "DocumentType": null,
        "Category": "Code Repos",
        "Icon": null,
        "ProviderId": 2
    }, {
        "Name": "GitHub",
        "Description": null,
        "Id": "xxx",
        "DocumentType": null,
        "Category": "Code Repos",
        "Icon": null,
        "ProviderId": 2
    }, {
        "Name": "Re",
        "Description": null,
        "Id": "xxx",
        "DocumentType": null,
        "Category": "Academic",
        "Icon": null,
        "ProviderId": 2
    }, {
        "Name": "Ir",
        "Description": null,
        "Id": "xxx",
        "DocumentType": null,
        "Category": "Dating",
        "Icon": null,
        "ProviderId": 2
    }, {
        "Name": "Ru",
        "Description": null,
        "Id": "xxx",
        "DocumentType": null,
        "Category": "Academic",
        "Icon": null,
        "ProviderId": 2
    }, {
        "Name": "LoveA",
        "Description": null,
        "Id": "xxx",
        "DocumentType": null,
        "Category": "Dating",
        "Icon": null,
        "ProviderId": 2
    }, {
        "Name": "LoveH",
        "Description": null,
        "Id": "xxx",
        "DocumentType": null,
        "Category": "Dating",
        "Icon": null,
        "ProviderId": 2
    },.........
]

Note that the JSON above does not come in any type of order. The Category names themselves are in order by me doing this:

dataSource: {
   data: resultData,
   schema: {
       model: {
          children: 'items'
       },
       parse: (data) => {
          let newData = [];

           //Re-order catagory names A-Z
           data.sort((a, b) => (a.Category > b.Category) ? 1 : -1);
....

The rest of the above code looks like this::

           data.forEach(item => {
              let parent = newData.find(parentItem => parentItem.text === item.Category);

              if (!parent) {
                 //The beginning of the tree category
                 parent = {
                     id: 2,
                     text: item.Category,
                     expanded: true,
                     items: [],
                     imageUrl: "" + item.Icon + ""
                 };

                 newData.push(parent);
              }

              parent.items.push({
                 //Each "child" under the above category
                 id: 3,
                 text: item.Name,
                 imageUrl: "" + item.Icon + ""
              });
           });

           return [{
              id: 1,
              text: 'Categories',
              expanded: true,
              items: newData
           }];
       }
   }
 }
});

How would I, using the code above, sort also the child items under each category name?

I've tried already adding this to the code:

sort: {
   field: "Name", 
   dir: "asc"}