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Get original (old) value from control in javascript

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  • Get original (old) value from control in javascript

    In a UX say I change the value of a textbox from "A" to "B". I can easily get the latest (new) value with the getValue() method in that textbox's onChange event. Is there a method to get the original value?

    Thanks.
    Mike Brown - Contact Me
    Programmatic Technologies, LLC
    Programmatic-Technologies.com
    Independent Developer & Consultant

  • #2
    Re: Get original (old) value from control in javascript

    try this and see if it works:
    on the onFocus event for the control add an inlineJavascript
    Code:
    oldValue = {dialog.object}.getValue('YOUR CONTROL NAME');
    then on the onChange event
    Code:
    var newValue = {dialog.object}.getValue('YOUR CONTROL NAME');
    alert(oldValue);
    alert(newValue);
    please note that oldValue does not have the var making that automatically a global variable.
    Last edited by GGandhi; 04-19-2016, 06:04 AM.
    thanks for reading

    gandhi

    version 11 3381 - 4096
    mysql backend
    http://www.alphawebprogramming.blogspot.com
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    • #3
      Re: Get original (old) value from control in javascript

      Thanks Gandhi but oldValue alerts as "undefined".
      Mike Brown - Contact Me
      Programmatic Technologies, LLC
      Programmatic-Technologies.com
      Independent Developer & Consultant

      Comment


      • #4
        Re: Get original (old) value from control in javascript

        because you do not have anything in it yet, put a value and go back and see
        thanks for reading

        gandhi

        version 11 3381 - 4096
        mysql backend
        http://www.alphawebprogramming.blogspot.com
        [email protected]
        Skype:[email protected]
        1 914 924 5171

        Comment


        • #5
          Re: Get original (old) value from control in javascript

          ahhh ....I see my error now. This works great! Thanks!

          Until this moment I presumed that the various events couldn't cross reference one another.
          Mike Brown - Contact Me
          Programmatic Technologies, LLC
          Programmatic-Technologies.com
          Independent Developer & Consultant

          Comment


          • #6
            Re: Get original (old) value from control in javascript

            You can also get the old value from the "e" object during an ajax callback as well. It's something like "oldDataSubmitted" or "dataSubmittedOld". I can't recall exactly. Anyway, sometimes it's handy for me to compare the old to the new in the after validate event.which is where I usually use that.

            Comment


            • #7
              Re: Get original (old) value from control in javascript

              http://screencast.com/t/OlOq00z9

              no mic yet on this computer I tabbed around to get back and reverted to the old value by click of button.
              if you need to capture anything else proper place to capture will be onRenderComplete event to capture any value to the javascript global namespace.
              thanks for reading

              gandhi

              version 11 3381 - 4096
              mysql backend
              http://www.alphawebprogramming.blogspot.com
              [email protected]
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              • #8
                Re: Get original (old) value from control in javascript

                Originally posted by -Jinx- View Post
                You can also get the old value from the "e" object during an ajax callback as well. It's something like "oldDataSubmitted" or "dataSubmittedOld". I can't recall exactly. Anyway, sometimes it's handy for me to compare the old to the new in the after validate event.which is where I usually use that.
                Thanks Jinx. I do use the "e" object for various other operations.
                Mike Brown - Contact Me
                Programmatic Technologies, LLC
                Programmatic-Technologies.com
                Independent Developer & Consultant

                Comment


                • #9
                  Re: Get original (old) value from control in javascript

                  Originally posted by mikeallenbrown View Post
                  Thanks Jinx. I do use the "e" object for various other operations.
                  that will require round trip to server!
                  thanks for reading

                  gandhi

                  version 11 3381 - 4096
                  mysql backend
                  http://www.alphawebprogramming.blogspot.com
                  [email protected]
                  Skype:[email protected]
                  1 914 924 5171

                  Comment


                  • #10
                    Re: Get original (old) value from control in javascript

                    Originally posted by GGandhi View Post
                    that will require round trip to server!
                    Yup,
                    I didn't know if he was truly looking for a client-side or server-side solution. So I figured why not give both.

                    Comment


                    • #11
                      Re: Get original (old) value from control in javascript

                      I did not criticize you a.h
                      just pointed it out.
                      thanks for reading

                      gandhi

                      version 11 3381 - 4096
                      mysql backend
                      http://www.alphawebprogramming.blogspot.com
                      [email protected]
                      Skype:[email protected]
                      1 914 924 5171

                      Comment


                      • #12
                        Re: Get original (old) value from control in javascript

                        Originally posted by GGandhi View Post
                        I did not criticize you a.h
                        just pointed it out.
                        I know, no worries.

                        Comment


                        • #13
                          Re: Get original (old) value from control in javascript

                          Mike,

                          I know this has been answered before, but you don't have to store any value as Alpha Anywhere already does that as long as you don't submit the form.

                          Code:
                          {dialog.object}.originalValues[0]['YOUR CONTROL NAME HERE']
                          You can also set the original values in code by using the following code.

                          Code:
                          for(var object in {dialog.object}.originalValues[0])
                          	{
                          		{dialog.object}.originalValues[0][object] = {dialog.object}.getValue(object);
                          	}
                          Regards,
                          Joshua

                          Comment


                          • #14
                            Re: Get original (old) value from control in javascript

                            Thanks Joshua! Works beautifully.
                            Mike Brown - Contact Me
                            Programmatic Technologies, LLC
                            Programmatic-Technologies.com
                            Independent Developer & Consultant

                            Comment


                            • #15
                              Re: Get original (old) value from control in javascript

                              Joshua,

                              How did you find that?? I ask because your method works great for a textbox but I get undefined for a drop down. Maybe there is a different method for a dropdown?
                              Mike Brown - Contact Me
                              Programmatic Technologies, LLC
                              Programmatic-Technologies.com
                              Independent Developer & Consultant

                              Comment

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