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TreeView Problems

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TreeView
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Alberto
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Alberto asked on 06 Apr 2020, 02:53 PM
I have been testing the Treeview control and found some problems:

1. Lazy Loading doesnt work for more than first-level as in the sample, but if there are more sublevels it doesnt work. Can you explain or put demo how this work?

2. Lazy Loading even on level 0 nodes I expand and unexpand some nodes and it expands some times and others dont.

3. As on demand loading not working well I tried to load everything at first and with a large collection like a directory/subdirectory structure and it didnt work.


See attached data, when loading all data in tree not all treeitems are shown. No errors are given.

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Alberto
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answered on 06 Apr 2020, 03:08 PM

this is data sample:

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fa-folder","Expanded":false},{"Id":6,"Text":"\\\\192.168.199.242\\repo1\\publish\\runtimes\\unix","Path":"\\\\192.168.199.242\\repo1\\publish\\runtimes\\unix","ParentIdValue":5,"HasChildren":true,"Icon":"far fa-folder","Expanded":false},{"Id":7,"Text":"\\\\192.168.199.242\\repo1\\publish\\runtimes\\unix\\lib","Path":"\\\\192.168.199.242\\repo1\\publish\\runtimes\\unix\\lib","ParentIdValue":6,"HasChildren":true,"Icon":"far fa-folder","Expanded":false},{"Id":8,"Text":"\\\\192.168.199.242\\repo1\\publish\\runtimes\\unix\\lib\\netcoreapp3.1","Path":"\\\\192.168.199.242\\repo1\\publish\\runtimes\\unix\\lib\\netcoreapp3.1","ParentIdValue":7,"HasChildren":true,"Icon":"far fa-folder","Expanded":false},{"Id":9,"Text":"\\\\192.168.199.242\\repo1\\publish\\runtimes\\unix\\lib\\netcoreapp3.1\\Modules","Path":"\\\\192.168.199.242\\repo1\\publish\\runtimes\\unix\\lib\\netcoreapp3.1\\Modules","ParentIdValue":8,"HasChildren":true,"Icon":"far fa-folder","Expanded":false},{"Id":10,"Text":"\\\\192.168.199.242\\repo1\\publish\\runtimes\\unix\\lib\\netcoreapp3.1\\Modules\\Microsoft.PowerShell.Host","Path":"\\\\192.168.199.242\\repo1\\publish\\runtimes\\unix\\lib\\netcoreapp3.1\\Modules\\Microsoft.PowerShell.Host","ParentIdValue":9,"HasChildren":true,"Icon":"far fa-folder","Expanded":false},{"Id":11,"Text":"\\\\192.168.199.242\\repo1\\publish\\runtimes\\unix\\lib\\netcoreapp3.1\\Modules\\Microsoft.PowerShell.Management","Path":"\\\\192.168.199.242\\repo1\\publish\\runtimes\\unix\\lib\\netcoreapp3.1\\Modules\\Microsoft.PowerShell.Management","ParentIdValue":9,"HasChildren":true,"Icon":"far fa-folder","Expanded":false},{"Id":12,"Text":"\\\\192.168.199.242\\repo1\\publish\\runtimes\\unix\\lib\\netcoreapp3.1\\Modules\\Microsoft.PowerShell.Security","Path":"\\\\192.168.199.242\\repo1\\publish\\runtimes\\unix\\lib\\netcoreapp3.1\\Modules\\Microsoft.PowerShell.Security","ParentIdValue":9,"HasChildren":true,"Icon":"far 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fa-folder","Expanded":false},{"Id":20,"Text":"\\\\192.168.199.242\\repo1\\publish\\runtimes\\win\\lib\\netcoreapp3.1\\Modules\\Microsoft.PowerShell.Host","Path":"\\\\192.168.199.242\\repo1\\publish\\runtimes\\win\\lib\\netcoreapp3.1\\Modules\\Microsoft.PowerShell.Host","ParentIdValue":17,"HasChildren":true,"Icon":"far fa-folder","Expanded":false},{"Id":21,"Text":"\\\\192.168.199.242\\repo1\\publish\\runtimes\\win\\lib\\netcoreapp3.1\\Modules\\Microsoft.PowerShell.Management","Path":"\\\\192.168.199.242\\repo1\\publish\\runtimes\\win\\lib\\netcoreapp3.1\\Modules\\Microsoft.PowerShell.Management","ParentIdValue":17,"HasChildren":true,"Icon":"far fa-folder","Expanded":false},{"Id":22,"Text":"\\\\192.168.199.242\\repo1\\publish\\runtimes\\win\\lib\\netcoreapp3.1\\Modules\\Microsoft.PowerShell.Security","Path":"\\\\192.168.199.242\\repo1\\publish\\runtimes\\win\\lib\\netcoreapp3.1\\Modules\\Microsoft.PowerShell.Security","ParentIdValue":17,"HasChildren":true,"Icon":"far 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fa-folder","Expanded":false},{"Id":26,"Text":"\\\\192.168.199.242\\repo1\\publish\\support","Path":"\\\\192.168.199.242\\repo1\\publish\\support","ParentIdValue":2,"HasChildren":true,"Icon":"far fa-folder","Expanded":false},{"Id":27,"Text":"\\\\192.168.199.242\\repo1\\publish\\tempdata","Path":"\\\\192.168.199.242\\repo1\\publish\\tempdata","ParentIdValue":2,"HasChildren":true,"Icon":"far fa-folder","Expanded":false}]

0
Marin Bratanov
Telerik team
answered on 06 Apr 2020, 05:09 PM

Hi Alberto, 

Could you check if this is the issue you're hitting: https://feedback.telerik.com/blazor/1459796-treeview-does-not-expand-when-using-async-methods? If this is a separate problem, please modify the sample from the public issue page to showcase the difference you are facing. Or, alter the docs, whichever you find easier.

I am also attaching here a small sample app I made based on this data and it works fine for me. I am also adding a short video that demonstrates how it works for me. If comparing against it does not help you move forward, please modify it to showcase the problem.

 

Regards,
Marin Bratanov
Progress Telerik

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Alberto
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Alberto
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Marin Bratanov
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