I was wondering if anyone knows how to check if an image being uploaded with the DataObjectManager/Uploadify modules is of the correct dimensions and only successfully upload it if it is, otherwise reject it and alert the user?

I have a banner image on my page which randomly selects a handful of images from a folder and displays them using the jquery cycle plugin. However, for it to work correctly, the images need to be a specific dimension. It is a photography website so the photos have to be resized in photoshop beforehand as resizing/resampling/cropping the images in the controller or template does not give me the result I want.

I would really appreciate it if anyone in the forums could help me out.

Cheers - Chris

Doesn't anyone know how to do this? - Chris

I would use a validate() function on your DataObject and check $this->YourImage()->getWidth() and $this->YourImage()->getHeight(). If it doesn't fit the spec, throw a validation error.

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SilverStripe tips, tutorials, screencasts and more: http://www.leftandmain.com

Thanks for getting back to me UncleCheese..... How do I get it to throw a validation error? I've tried the testing for the width and height with the following code:

public function validate() {
if($this->myImage()->getWidth() != 930 || $this->myImage()->getHeight() != 330){
/*Throw Validation Error*/
}

But it doesn't like that!.... any help would be appreciated

- Chris

Return a ValidationResult http://api.silverstripe.org/2.4/sapphire/core/ValidationResult.html

--------------------
SilverStripe tips, tutorials, screencasts and more: http://www.leftandmain.com

Hi UncleCheese.... I sort of got it working using the onBeforeWrite() function

public function onBeforeWrite() {

if(($this->myImage()->getWidth() != "930") && ($this->myImage()->getHeight() != "330")){

exit();
}
parent::onBeforeWrite();
}

Now this works as I can upload an image with the correct dimensions successfully but uploading a small image returns a blank popup so I assume I'm heading in the right direction..... still lost regarding displaying an error message and closing the popup.

- Chris

Right - Got it working! Here is the working code in case anyone wants to use it

public function onBeforeWrite() {

if(($this->myImage()->getWidth() != "930") && ($this->myImage()->getHeight() != "330")){
die ('<script type="text/javascript">alert("Sorry! Those Image Dimensions Are Invalid. Please Try Again");history.back();</script>');
}
parent::onBeforeWrite();
}