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Multiple dropdowns

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    #1

    Multiple dropdowns

    In a dialog component can we filter subsequent dynamic dropdown lists based on the previous dropdown display value? I would like to create a 3 or 4 level category selection.

    Thanks
    Tags: None
    #2
    RE: Multiple dropdowns

    You can accomplish by using cascading dropdowns that filter on another value (variable or constant).

    Create your second dropdown. In the choices filter (hit the smart button first) type the name of field you are going to filter against in your 2nd dropdown choices, followed by "=?". The ? becomes a placeholder where the value of another control gets inserted at Run time, which you specify by mapping the parameter to the variable.

    For instance here is an example where there 3 dropdowns and the choices for each the will come from the Products Table. However, each subsequent choices filters the choices in the next.

    Drop Down 1(DD1) = ProductDept Field in table = Dept
    Drop Down 2(DD2) = Category Field in table = Cat
    Drop Down 3(DD3) = ProductName Field in table = Prod

    DD1 has no filter on the choices list, all Depts will show in the choices.

    DD2 has this filter -" Dept = ?
    ? is mapped to ProductDept
    Only records that match the ProductDept choosen in DD1 will be displayed.

    DD3 has this filter -" Cat = ?
    ? is mapped to Category
    Only records that match the Category choosen in DD2 will be displayed.

    Each selection does a postback to the server and updates the choices list.

    John Bowen
    www.alpha5host.com
    alpha 5 hosting

    Comment

      #3
      RE: Multiple dropdowns

      There is a cascading lookup example at http://was.alphasoftware.com/web_applications_demo/default/Dialog_wCascadingLookup.a5w. This example is also included with the Web Applications Demo sample app that was installed with Alpha Five. The page explains the details of how to build such a page.

      -Lenny

      Lenny Forziati
      Vice President, Internet Products and Technical Services
      Alpha Software Corporation

      Comment

        #4
        RE: Multiple dropdowns

        Can you have two or three of these web components that refresh independently. I cannot seem to get an answer from technical support.

        thank you in advance,

        /jtk

        Comment

          #5
          RE: Multiple dropdowns

          Yes, you can more than one component on your page that does this.

          Lenny Forziati
          Vice President, Internet Products and Technical Services
          Alpha Software Corporation

          Comment

            #6
            RE: Multiple dropdowns

            Here is the problem...

            Two web components on a single page. Both components are identical to the cascading example. User selects a value from the first component and the rest of that component populates with values. No problem.

            User selects a value from the second component. The second component updates correctly but on the same refresh, the first web component updates again (usually to the first row of the table it was looking up).

            I do not want the first component to be updated a second time with the wrong value.

            I have both components looking at the same customer table and I changed the control names in the second web component to be (Customer_Id2, Company2...etc. I am not sure how else to attack this.

            Can this behavior be stopped?

            thank you in advance,

            /jtk

            Comment

              #7
              RE: Multiple dropdowns

              Here is the problem...

              Two web components on a single page. Both components are identical to the cascading example. User selects a value from the first component and the rest of that component populates with values. No problem.

              User selects a value from the second component. The second component updates correctly but on the same refresh, the first web component updates again (usually to the first row of the table it was looking up).

              I do not want the first component to be updated a second time with the wrong value.

              I have both components looking at the same customer table and I changed the control names in the second web component to be (Customer_Id2, Company2...etc. I am not sure how else to attack this.

              Can this behavior be stopped?

              thank you in advance,

              /jtk

              Comment

                #8
                RE: Multiple dropdowns

                What you are seeing is normal behavour for any web page. Since the page isn't "connected" to anything, the only way to "refresh" the screen is to resubmit the whole page, which affects anything on the page. Also, every component is a separate web "form". When a component is submitted, it submits only it's form data. This effect can effect any web page that has multiple form regions.

                There are some ways around the problem, such as capturing some value from the first component change and resubmitting it when the second component submits, but it would require some behind the scenes work with html.

                Jerry

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