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Center Google Map dynamically

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    Center Google Map dynamically

    See attached image.

    Google Center Map.gif

    I need to center the map on the users zip code using a session variable or other method. The field does not accept a variable. Is there a way?
    Peter
    AlphaBase Solutions, LLC

    [email protected]
    https://www.alphabasesolutions.com



    #2
    Re: Center Google Map dynamically

    It's not ideal but what I do is set a variable and then add the following code to the onDialogInitialize Server-side event where the map control is being used (assuming the map control is named M1 and my global variable containing the address is "addr"):

    if variable_exists("addr")
    e.javascript = "var a1 = '" + addr + "'; " ' Set initial location to address if specified
    else
    e.javascript = "var a1 = '151 Springtown Road, Toronto ON, Canada';" ' Set a default initial location if none specified in call (addr is undefined)
    end if
    e.javascript = e.javascript+"var m1 = {dialog.Object}.getControl('m1'); m1.setCenter(a1);" ' Sets the center location
    e.javascript = e.javascript+" var settings={ title: a1 }; m1.addMarker('add1',a1, settings);" ' and adds a marker
    The reason I say this is not ideal is that you will still get a quick flash of the Burlington map and then be immediately centered on your location contained in the variable "ADDR" with a marker at the address. Ideally what we should have exposed is the property of the M1 map control to set the initial center without having to call setCenter which results in a second call to the Google API. This works if you are using the new Map control in a Dialog 2 component. I haven't tried this using the Google Maps web component. There are arguments you can access in the Google Maps web component for CenterLat, CenterLong and CenterAddress but I haven't figured out quite how to use those yet. It seems like they would be a logical choice for doing what you're wanting to attempt if only they were documented!

    Suggestions Alpha support?
    Last edited by compuaid; 04-24-2012, 10:02 AM.
    Brad Weaver, President
    ComputerAid International
    Ottawa ON Canada
    Versailles KY USA
    www.compuaid.com

    Comment


      #3
      Re: Center Google Map dynamically

      Thanks Brad. At least there is hope.
      Peter
      AlphaBase Solutions, LLC

      [email protected]
      https://www.alphabasesolutions.com


      Comment


        #4
        Re: Center Google Map dynamically

        Peter if you use the sensor for centering - the map will sense (centre) where it is even not in a mobile device - it works client-side in the browser on desktop. - Some browsers will ask permission some don't.
        Insanity: doing the same thing over and over again and expecting different results.
        Albert Einstein, (attributed)
        US (German-born) physicist (1879 - 1955)

        Comment


          #5
          Re: Center Google Map dynamically

          Thanks for the tip Pete. Right now that web site is off line, But I'll test that when we put it back up. Just not sure we can tolerate the browser asking permission.
          Peter
          AlphaBase Solutions, LLC

          [email protected]
          https://www.alphabasesolutions.com


          Comment


            #6
            Re: Center Google Map dynamically

            Happens in Firefox - it remembers (I think).. anyhow have a go.
            Insanity: doing the same thing over and over again and expecting different results.
            Albert Einstein, (attributed)
            US (German-born) physicist (1879 - 1955)

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