用javascript计算小计和总计

Question

I am trying to add two values together. The value of #price and the value of #subtotal. Subtotal is being calculated with the Jquery script and is working. The other script isn't working but does work on its own.

The div's #price, #subtotal and #total must be div's and cannot be changed into text fields with value.

Code:

 /* JQUERY */ jQuery(document).ready(function($) { $("#checkboxdiv input:checkbox").change(function() { var total = 0; $('#checkboxdiv input:checkbox:checked').each(function() { total += parseInt(this.value, 10); }); $('#subtotal').text(total); }); }); /* JAVASCRIPT */ $(document).ready(function() { $("#total").append(addnumbers($("#price").html(), $("#subtotal").html())); }); function addnumbers(price, subtotal) { return (Number(price) + Number(subtotal)); }; 

 <script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script> <div id="price">10500</div> <div id="checkboxdiv"> <input type="checkbox" value="300">Optie 1 <input type="checkbox" value="750">Optie 2 <input type="checkbox" value="25">Optie 3 <input type="checkbox" value="1200">Optie 4 </div> <div id="subtotal"></div> <div id="total"></div> 

Answer 1

I'm not completely sure if I understand what you want... I guess is that when you click a checkbox, subtotal and total are updated. If that's the case, you can do it with....

$("#checkboxdiv input:checkbox").change(function() {

    var subtotal = 0;

    $('#checkboxdiv input:checkbox:checked').each(function() {
        subtotal += parseInt(this.value, 10);
    });

    $('div#subtotal').text(subtotal);
    $('div#total').text(parseInt($('div#price').text()) + subtotal);
});

// If you want to show the initial values, just trigger the event.
$("#checkboxdiv input:checkbox").trigger('change');

I hope it helps

Answer 2

It looks like the reason you are not seeing the div#total change is because it is not subscribed to the checkbox changes, whereas div#subtotal is. I combined the contents of the two document ready functions, moved the div#total into the change listener, and it's working as expected.

See CodePen: https://codepen.io/anon/pen/OxjYBd

The combined code:

function addnumbers(price,subtotal){
  return (Number(price) + Number(subtotal));
};

$(document).ready(function() { 
  $("#checkboxdiv input:checkbox").change(function() {
    var total = 0;
    $('#checkboxdiv input:checkbox:checked').each(function() {
      total += parseInt(this.value, 10);
    });

    $('#subtotal').text(total);
    $("#total").text(addnumbers($("#price").html(), $("#subtotal").html()));
  });
});

Hope that helps.