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

James Froggatt
Last Modified: 2020-02-23
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 (){
        xhr.open("POST", "latLongToMap.php");

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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);

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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...
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