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Thread: display exif from image?

  1. #1
    Join Date
    Nov 2009
    Posts
    15

    display exif from image?

    Hi,

    I need to automatically display the images exif data, but it only works after clicking the image.
    Whats wrong?

    (Not) working Example:
    http://www.diystreetview.org/data/test/test.html
    all files:
    http://www.diystreetview.org/data/test/

    Code:
    <html>
    <head>
    
    <script type="text/javascript" src="jquery-1.3.2.min.js"></script>
    <script type="text/javascript" src="jquery.exif.js"></script>
    
    <title>test.html</title>
    </head>
    
    <body>
    <div id="imagediv">
    <img src="images/00000036.jpg" width="900px" id="imgA" exif="true" />
    </div>
    
    
    <script>
    // This cript should automatically display the exif info of the image. Without user interaction.
    // However it only works when the image is clicked.
    // 
    // EXIF Code from http://www.nihilogic.dk/labs/exifjquery/
    
    // FAILING:
    document.getElementById('imagediv').innerHTML +="<br \/\>GPSLatitude: " + $("#imgA").exif("GPSLatitude");
    
    // WORKS:
    $("#imgA").click(
    	function() {
    document.getElementById('imagediv').innerHTML +="<br \/\>GPSLatitude: " + $("#imgA").exif("GPSLatitude");
    
    	} // end function
    ) // end click
    
    </script>
    </body>
    </html>

  2. #2
    Join Date
    Apr 2003
    Location
    Netherlands
    Posts
    21,654
    Wait for the document to load, even the exif script does this.
    At least 98% of internet users' DNA is identical to that of chimpanzees

  3. #3
    Join Date
    Nov 2009
    Posts
    15
    How to change the code for waiting?

  4. #4
    Join Date
    Apr 2003
    Location
    Netherlands
    Posts
    21,654
    At least 98% of internet users' DNA is identical to that of chimpanzees

  5. #5
    Join Date
    Nov 2009
    Posts
    15
    Hi Fang,

    I gave it a try, and I cant get it working.
    So it's probably me.

    Please stop passing on ideas and show me how its done.

    My last try:

    Code:
    <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" 
                        "http://www.w3.org/TR/html4/loose.dtd">
    <html>
    <head>
      <script src="jquery-1.3.2.min.js"></script>
      <script src="jquery.exif.js"></script>
      
    </head>
    <body>
    <div id="imagediv"></div>
    
    <script>
    document.getElementById('imagediv').innerHTML = "<img src=\"images/00000036.jpg\" width=\"400px\" id=\"imgA\" exif=\"true\" \/\>";
    
    $(document).ready(function(){
    document.getElementById('imagediv').innerHTML +=("GPSLatitude:" + $("#imgA").exif("GPSLatitude"));
    });
     </script>
    
    </body>
    </html>

  6. #6
    Join Date
    Oct 2009
    Posts
    658
    You might want to view the image as a Hex. I might overlooked it but I don't saw any GeoData inside the image.
    Good Luck

    Santos Systems

  7. #7
    Join Date
    Nov 2009
    Posts
    15
    Firefox Add-on Exif Viewer shows all the images EXIF data is in perfect order.

    You can download it here:
    https://addons.mozilla.org/en-US/fir...=exif%20viewer

  8. #8
    Join Date
    Nov 2009
    Posts
    15
    Anyone?

  9. #9
    Join Date
    Apr 2003
    Location
    Netherlands
    Posts
    21,654
    Code:
    $('#imgA').load(function() {  
    document.getElementById('imagediv').innerHTML +="<br \/\>GPSLatitude: " + $("#imgA").exif("GPSLatitude");
    });
    At least 98% of internet users' DNA is identical to that of chimpanzees

  10. #10
    Join Date
    Nov 2009
    Posts
    15
    I tried that before.

    It works 1 out of 10 times. Or less.

    Here is the new test page:
    http://www.diystreetview.org/data/test/testA.html

    All files:
    http://www.diystreetview.org/data/test/

  11. #11
    Join Date
    Apr 2003
    Location
    Netherlands
    Posts
    21,654
    Seems to require a slight delay.
    Code:
    $('#imgA').load(function() {  
    setTimeout(function(){return document.getElementById('imagediv').innerHTML +="<br \/\>GPSLatitude: " + $("#imgA").exif("GPSLatitude");}, 500);
    });
    At least 98% of internet users' DNA is identical to that of chimpanzees

  12. #12
    Join Date
    Nov 2009
    Posts
    15
    Thanks Fang,

    you made my day.
    It works.
    I will inform the author of the exif library.
    Maybe there is something he can update.

    Jan

  13. #13
    Join Date
    Nov 2009
    Posts
    15
    To early to celebrate.

    I need the value in a variable to deal with it later.
    But this fails:

    Code:
    var gpslatitude;
    $('#imgA').load(function() {  
    setTimeout(function(){return gpslatitude=$("#imgA").exif("GPSLatitude");}, 500);
    });
    //Test:
    document.getElementById('nav').innerHTML +=gpslatitude;
    Last edited by janmartin; 11-23-2009 at 11:13 AM.

  14. #14
    Join Date
    Apr 2003
    Location
    Netherlands
    Posts
    21,654
    Same problem again; the innerHTML is executed before setTimeout has finished.
    Save the value in gpslatitude and wait for user interaction or delay writing until setTimeout has finished.
    At least 98% of internet users' DNA is identical to that of chimpanzees

  15. #15
    Join Date
    Nov 2009
    Posts
    15
    I changed a single line of the test:

    Code:
    setTimeout(function(){return document.getElementById('nav').innerHTML +=gpslatitude;}, 1000);
    It works.

    However what i really need is to get the data into a variable and out of the whole setTimeout thingy:
    This code fails:
    Code:
    $('#imgA').load(function(){setTimeout(function(){return myGPSLatitude=$("#imgA").exif("ImageDescription");}, 1000);});
    document.getElementById('nav').innerHTML += myGPSLatitude;
    Any idea?

    Also there must be a way around this whole two-times-waiting?
    Is it an error in the jquery.exif.js i am using?

    Thanks,
    Jan
    Last edited by janmartin; 11-23-2009 at 12:05 PM.

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