Simple javascript loop not working

Question

I'm not that experienced yet with JavaScript, so I'm probably overlooking something here:

var products = document.getElementsByClassName('product');
var productsLength = products.length;

for(var i = 0; i < productsLength; i++){
  var productGender = products[i].attr('data-gender');

  if(productGender === triggerVal){
    console.log('yes');
  } else {
    console.log('no');
  }
};

It says: products[i].attr is not a function

I should be able to access it right? The product is just a list item.

Thanks!

Answer 1

attr is a jQuery method, use getAttribute

http://www.w3schools.com/jsref/met_element_getattribute.asp

Answer 2

 var productGender = products[i].getAttribute('data-gender');

你需要什么，你使用了jquerys .attr（）

Answer 3

By far the easiest way to get data-xyz attributes for an element is to use .dataset object

eg in your case

var productGender = products[i].dataset.gender;

MDN - https://developer.mozilla.org/en-US/docs/Web/API/HTMLElement/dataset

usual warnings - IE11+ only (other browsers have supported it for years) - there's no polyfill

if you need early IE support, then use = getAttribute("data-gender"); as others have suggested

Answer 4

It's because you use Jquery function on DOM element. You should either use native javascript function to retrieve attribute value or you can convert element to Jquery object and then keep using Jquery.

So, instead of

products[i].attr('data-gender');

you can:

$(products[i]).attr('data-gender');