Can I check if lets say an image in index.php is seen by user? I do not only want to know if page is visited, but also user scrolled down the page and this image is displayed or not.
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Can I check if lets say an image in index.php is seen by user? I do not only want to know if page is visited, but also user scrolled down the page and this image is displayed or not.
It’s not an easy thing to do.
You need to check is if user scrolled down to the position of element, and then, if true, make an AJAX call to PHP that will save this information into the database.
Most accurate way to do this is by using jQuery .scrollTop to see how far user scrolled down and compare it with .offset.
Keep in mind though that it’s not 100% accurate. It should be good enough for most of layouts and most of images, however small pictures placed in layouts that use lot of paddings will most likely return incorrect results (either indicating that image was viewed before it actually was, or after, assuming you scroll down to see it).
If I were you – I’d try to avoid this functionality. 😉 It’s just too prone to errors that you can’t really do anything about.