Dynamically add product schema to an ecommerce site`s products

Selected answers from the Dumb SEO Questions Facebook & G+ community.

• 
  John Bosworth: How are you adding the product info dynamically?Are you creating selectors and grabbing Dom elements? Can you grab the og:image element you’ve set for that page?
• 
  Kyle Doran: I`m using DOM element CSS selector to target on page elements. For example I targeted the product title with: h2.product_title.entry-title. I`m sure I`m only missing something simple in trying to target the product image, but I can`t seem to figure it out. I like the idea of grabbing the og:image element, however I`m not quite sure how to go about doing this. I`ve tried using a javascript variable: $(`metaproperty="og:image":eq(0)`).attr(`content`) to no avail. Any ideas? Thanks again for your help :)
• 
  Tajmul Hossain: Our property comes from partners site dynamically. Is it same things?
• 
  Kyle Doran: I`m not sure what you mean.. I`m trying to target the product image for schema instead of having to add the url for the image for each product separately.
• 
  Dave Elliott: You need to either find something unique and common across all the mages you intend to use (class, height, width, folder, image format etc.) Or it needs to be in the same place in the code each time(e.g. image in 3rd div on the page) in which case you can grab it with x-path.
• 
  Kyle Doran: Thank you for your tip. I`m trying this out today. It looks like x-path doesn`t work with google tag manager. Each product image is located in the same area on each product. I`ve tried tons of different element paths, but I can`t seem to get it correct as my results are always " " or "false" or "null" for the image schema. Would it be correct to target img.wp-post-image? I`ve tried this before without getting the image url back. I`m sure I`m just missing something simple. Any ideas? Thank you again for your help!
• 
  Kyle Doran: SOLVED! Was able to use a custom javascript function to target the correct image on page. function() {var picture = document.getElementsByClassName("woocommerce-product-gallery__image")0.getElementsByTagName("img")0;var src = picture.getAttribute(`src`);return src; } Thanks again for your help everyone! Much appreciated :)