如何使用$ key按名称获取元素

Question

PHP

  //Here is my html for qty

       <p>Qty : <input type="number"  value="" name="qty<?php echo $key ?>   onChange="findTotal()"/> 

JS function

        function findTotal() {
        var arr = document.getElementsByName('qty');
      ...

        document.getElementById('result').value = decimalPlaces(tot, 2);

        }

My qty name needs key for post array. How do I get name inside js function to calculate quantities?

Answer 1

You can do something like this

  var myVar = document.getElementsByTagName("somename");
  //do something else

If you are using jquery

value = $( "input[name^='qtd']" ).val();
//it will pick the input wich name starts with 'qtd'