Telerik RadComboBox takes lot of time when doing filter in it, using LoadOnDemand mechanism

4 posts, 0 answers
  1. Priyanka
    Priyanka avatar
    34 posts
    Member since:
    Dec 2014

    Posted 12 Aug 2015 Link to this post

    I have a RadComboBox control inside RadGrid in which Items are loaded using LoadOnDemandmechanism i.e., _ItemRequested() event

    All working fine except the 2 issues:
    1) There is a significant lag between the time the end-user begins typing and when the filtered items show up. What I observed that the searching in RadcomboBox is done character wise not Word wise.
    2) Also, takes time to load data regardless of what value is set in ItemPerRequest property in RadComboBox when using LoadOnDemand.

    The maximum items in this RadComboBox can be 20,000+ as well.
    User is complaining again and again for the performance issue. Please someone let me know the simplest way of resolving the 2 issues.
    I followed below Link (Server Side method), to achieve LoadOnDemand functionality:
    If there is no solution to solve the 2 preformance issue then please let me know how to do the searching in RadComboBox, which is inside RadGrid, using LoadOnDemand approach on BUTTON click ?? Will this resolve the 1st Issue ??
    Please note that I am new in Telerik. Thanks in advance.

  2. Priyanka
    Priyanka avatar
    34 posts
    Member since:
    Dec 2014

    Posted 15 Aug 2015 in reply to Priyanka Link to this post

    Please someone reply to my posted question as its already been long since I had posted my here. Still I am stuck in this and unable to find any solution. I am having deadline to resolve it. Please I request all the Telerik experts here to help me in resolving this as soon as possible. Specially the 1st issue.

    Thanks in advance.

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  4. Priyanka
    Priyanka avatar
    34 posts
    Member since:
    Dec 2014

    Posted 15 Aug 2015 in reply to Priyanka Link to this post

    I saw this link ( as well. The search is working so smoothly here without any lag then why not in my code ?

    I followed same link for "Load on Demand" mechanism i.e., Server-Side approach, for 2nd RadComboBox

    Please reply.

  5. Nencho
    Nencho avatar
    1446 posts

    Posted 17 Aug 2015 Link to this post

    Hello Priyanka,

    The data you attempt to populate the control with is enormous and it is an inevitably slow operation, considering the enormous amount of HTML that needs to be rendered on the page.

    You can try to enhance the process, using the approach demonstrated in the online demo that you have referenced - try to enable the VirtualScrolling and define a ItemsPerRequest as demonstrated in the RadComboBox2_ItemsRequested event handler in the code of the DefaultCS.aspx.cs page. Ofcourse, you can increase the items per request to a preferable value, in order to boost the loading process.

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