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NULL value in Dropdown Box

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    NULL value in Dropdown Box

    I have a DropDown Box that is populated by a table but I also want one of the choices to be a NULL value. Any suggestions?

    #2
    Re: NULL value in Dropdown Box

    Check NULL if blank (dialog) or Blank is NULL (grid)
    Add a value to the "Display value for no selection" option for the choices definition
    Alpha Anywhere latest pre-release

    Comment


      #3
      Re: NULL value in Dropdown Box

      I have the initial value set to NULL and blanks are handled as NULL on updates. This is great on the initial entry but if you update an existing record that has a value the dropdown list does not contain a null choice.

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        #4
        Re: NULL value in Dropdown Box

        It has been my experience that "Display value for no selection" adds the choice for all the dropdowns, existing & new. I don't know why it's not adding the option for your existing records.

        displayValueForNoSelection.png
        withNone.png
        Alpha Anywhere latest pre-release

        Comment


          #5
          Re: NULL value in Dropdown Box

          Assuming that "Display value for no selection" is not working for you...

          If you're using SQL, you can put a null option in your drop down using a UNION of 2 select statements. However, Alpha chokes & dies on UNION. You'll need to create a view in your database schema with the UNION definition and use that in place of your current query.

          Alternatively, you could add a choice either (pre) or (post). You may or may not need to set the value for your field to NULL in the onBeforeSQLExecute server-side event.
          Alpha Anywhere latest pre-release

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            #6
            Re: NULL value in Dropdown Box

            another way to do is
            when you define your choices after selecting all the things you need look down further there are two choices
            additional choices (pre) and (post) same picture as in post #4
            click on the pre and just add this pipe "|" sign (without the quotation.) nothing in front or back, just that pipe sign.
            you will get a null value displayed on the dropdown list.
            thanks for reading

            gandhi

            version 11 3381 - 4096
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              #7
              Re: NULL value in Dropdown Box

              Gandhi, the | worked perfectly. Thank you.

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