使用复选框向购物车添加折扣

Question

我真的需要一个可以帮助我的人:-)

我想通过在我的商店中单击各种复选框来为客户提供折扣。

访问者最多可以选择 4 个复选框。不是 5、6 等。可以这样做吗？

我现在的问题是客户实际上可以免费获得商品 - 或者更糟 - 我必须付费才能向他们出售商品！

这是测试代码：

    <script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>
<input type="checkbox" name="checkbox1" id="checkbox1" class="css-checkbox" value="20" />
<label for="checkbox1" class="css-label">banana</label><br>

<input type="checkbox" name="checkbox2" id="checkbox2" class="css-checkbox" value="20" />
<label for="checkbox2" class="css-label">apple</label><br>

<input type="checkbox" name="checkbox3" id="checkbox3" class="css-checkbox" value="20" />
<label for="checkbox3" class="css-label">biscuit</label><br>

<input type="checkbox" name="checkbox4" id="checkbox4" class="css-checkbox" value="20" />
<label for="checkbox4" class="css-label">jam </label><br>

<input type="checkbox" name="checkbox5" id="checkbox5" class="css-checkbox" value="20" />
<label for="checkbox5" class="css-label">orange </label><br>

<input type="checkbox" name="checkbox6" id="checkbox6" class="css-checkbox" value="20" />
<label for="checkbox6" class="css-label">pinepple </label><br>

<br /><br />

<span id="total"><b>Normal price: </b> 100</span></p>

<script>
var $total = 100;
var $total2 = 100;

$('input:checkbox').on('change', function() {
    if (this.checked)
        $total += -this.value;
    else
        $total -= -this.value;

        if ($total2 > $total)
            $('#total').html('<b>Discount  price: </b>'+$total);
        else
            $('#total').html('<b>Normal price: </b>'+$total);
});
</script>

Answer 1

所以逻辑是 -

If the 4 checkboxes are clicked then disable rest

var $total = 100;
var $total2 = 100;

$('input:checkbox').on('change', function() {
if($('input:checked').length == 4) { 
 $('input:checkbox:not(:checked)').attr("disabled", true);
  }
  else {
   $('input:checkbox:not(:checked)').attr("disabled", false);
  }
    if (this.checked)
        $total += -this.value;
    else
        $total -= -this.value;

        if ($total2 > $total)
            $('#total').html('<b>Discount  price: </b>'+$total);
        else
            $('#total').html('<b>Normal price: </b>'+$total);
            
});

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<input type="checkbox" name="checkbox1" id="checkbox1" class="css-checkbox" value="20" />
<label for="checkbox1" class="css-label">banana</label><br>

<input type="checkbox" name="checkbox2" id="checkbox2" class="css-checkbox" value="20" />
<label for="checkbox2" class="css-label">apple</label><br>

<input type="checkbox" name="checkbox3" id="checkbox3" class="css-checkbox" value="20" />
<label for="checkbox3" class="css-label">biscuit</label><br>

<input type="checkbox" name="checkbox4" id="checkbox4" class="css-checkbox" value="20" />
<label for="checkbox4" class="css-label">jam </label><br>

<input type="checkbox" name="checkbox5" id="checkbox5" class="css-checkbox" value="20" />
<label for="checkbox5" class="css-label">orange </label><br>

<input type="checkbox" name="checkbox6" id="checkbox6" class="css-checkbox" value="20" />
<label for="checkbox6" class="css-label">pinepple </label><br>

<span id="total"><b>Normal price: </b> 100</span>

使用复选框向购物车添加折扣

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