jquery - Disable Button if data-quantity is less than 1 -

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i want disable following button if "data-quantity" attribute less 1. can't figure out how form if statement this.

<button type="submit" data-product_id="1" data-product_sku="test" data-quantity="0" class="add_to_cart_button button product_type_simple">add cart</button>

i've tried this:

var cart_button = $('.add_to_cart_button'); if(cart_button.attr("data-quantity") < 1) {     cart_button.prop("disabled", true); }

jquery has built-in ability read (and set if need be) data tags. use .data() syntax. note, drop "data-" prefix when using property. also, sure wrapping in document.ready function. 

$(function(){     var cart_button = $('.add_to_cart_button');     if(cart_button.data("quantity") < 1) {         cart_button.prop("disabled", true);     } });

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