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Forcing a list drop-down event

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  • Forcing a list drop-down event

    I am writing a UX component for a mobile survey application. One of the things I would like to do at certain points is to set focus to a DropdownBox control and force the DropdownBox list to drop-down. Specifically, when the user clicks on the New button to create a detail record, I want to set focus on the first control (which is a DropdownBox control) for that detail item and force the DropdownBox list to drop-down in order to indicate that the user needs to choose one of those items next. Can I force the DropdownBox list to drop down in a javascript event?
    Last edited by srbjlb; 04-12-2018, 04:14 PM.

  • #2
    Re: Forcing a list drop-down event

    Do you mean a Textbox control configured as an Autosuggest List? The List Control, which is a very specific type of control, doesn't drop down.


    • #3
      Re: Forcing a list drop-down event

      My is a DropDownBox control within my UX control. I misspoke in my original post. I'm wanting to force the drop-down on the DropDownBox control. I'll go back and edit the original post.


      • #4
        Re: Forcing a list drop-down event

        I'm not sure that there is an official way to do this. This method is, in a sense, cheating. It's kind of turning the dropdown into a list... temporarily.

        From where ever you want to trigger the dropdown open...

        var dd = {dialog.Object}.getPointer('MachineType');
        var length = dd.options.length;
        dd.size = length;
        In the dropdown onChange event...

        var dd = {dialog.Object}.getPointer('MachineType');
        dd.size = 0;
        It doesn't look quite the same as when you actually click into the dropdown.


        • #5
          Re: Forcing a list drop-down event

          Thanks David. That's a nice way to bring attention to the fact that they need to choose a value from the dropdown. Works really well.


          • #6
            Re: Forcing a list drop-down event

            Something else you could do to draw a user's attention to the dropdown. Use something like OpenTip.