troubleshooting Question

How to get an ajax call to change an img src and update the displayed image without manual browser refresh

Avatar of James Froggatt
James FroggattFlag for France asked on
6 Comments1 Solution82 ViewsLast Modified:
I have an Ajax call;

  var xhr= new XMLHttpRequest();
        // this executres when the ajax request in completed, i.e. the results
        // are sent back from php
        xhr.onload = function (){
        }"POST", "latLongToMap.php");

This sends latitude and longitude coordinates from an autosuggest drop down box to my php code at latLongToMap.php.

latLongToMap.php does a load of processing and creates an image file that is returned to the ajax request by

echo ($img);

This code then changes the img src of

  <img id="myLocationImage" src="worldmap-withdot.jpg" width="150" height="150">

My problem is that the ajax request does work, and does change the file on the server. But for me to see the image, I have to CONTROL-F5 my browser.

What do I need to do so I see the new image file without having to manually refresh my browser?

I have attached an animated gif (I hope it works) showing my problem. When the gray image appears, I have to CONTROL-F5 to see the new image.

My ajax problem in real time
Please help, I've played around with various ideas I've found on the internet, but with no joy.


PS: Note I'm aware it always says 'Toulouse' by the label, I haven't done that bit of my code yet...
James Froggatt

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