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How can I display a default image when no image exists?


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On your details page there is an option to show a default image if you display your file as image. But if you do not have a file field to display your image and you only have the link to the image then you need to have an extra line of the code to check and see if the URL is blank then use a default URL. I have sample of the code, you are welcome to borrow it:
 

<script>
var image = '[@field:file1]';
if (image != "") {
document.write("[@field:file1]'>");
}
</script>

Make sure to replace file1 with your file field ID and also replace DefaultImageURL with URL of the image you would like to have as default.

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Well you can try this:

 

<script type="text/javascript">
var image= '[@field:file1]';

if (image != "") {

document.write("file1]','popup','resizable=no,location=no,menubar=no,scrollbars=no,status=no,toolbar=no,fullscreen=no,dependent=no,width=750,height=600'))\">");

}

else

{

document.write("URL','popup','resizable=no,location=no,menubar=no,scrollbars=no,status=no,toolbar=no,fullscreen=no,dependent=no,width=750,height=600'))\">DefaultImageURL\" alt=\"Default\" />");

}

</script>

URL is the URL of the large image in here.

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