javascript - 将输入的多个值相加并以形式选择

Question

我需要对来自多个 SELECTS 和 INPUTS 的值求和，这是我目前所拥有的:

HTML

<label>Item#1</label>
<select name="price[]" id="sel_1">
    <option value="">Options</option>
    <option value="4.00">Small</option>
    <option value="8.00">Medium</option>
</select>
<br>
<label>Item#2</label>
<select name="price[]">
    <option value="">Options</option>
    <option value="4.00">Small</option>
    <option value="8.00">Medium</option>
</select>
<br>
<label>Item#3</label>
<select name="price[]">
    <option value="">Options</option>
    <option value="4.00">Small</option>
    <option value="8.00">Medium</option>
</select>
<br>
<label>Item#4</label>
<input type="checkbox" value="1.00" id="price[3]" name="price[]">
<br>
<label>Item#5</label>
<input type="checkbox" value="2.00" id="price[3]" name="price[]">
<br>
<label>Item#6</label>
<input type="checkbox" value="3.00" id="price[3]" name="price[]">
<br> <span id="usertotal"> </span>

JQUERY

$('input:checkbox').change(function () {
    var tot = 0;
    $('input:checkbox:checked').each(function () {
        tot += Number($(this).val());
    });
    tot += Number($('#sel_1').val());
    $('#usertotal').html(tot)
});

$('#sel_1').change(function () {
    $('input:checkbox').trigger('change');
});

如您所见，它只对第一个选择的值求和，我也需要它对所有选择求和。

演示: http://jsfiddle.net/B9ufP/

Answer 1

试试这个:
(我简化了你的代码)

(function ($) {
    var $total = $('#usertotal');
    $('input,select:selected').on('change', function () {
        var tot = 0;
        $(':checked, select').each(function () {
            tot += ~~this.value;
        });
        $total.html(tot)
    });
}(jQuery))

演示 here