如何从下拉列表中添加购物车价格

Question

我想在点击其中之一时添加价格<div class="col-12 col-sm-9 col-md-9 col-lg-8">                            <select class="form-control" type="text" value="">                              <option value="0">Not Required</option>                              <option value="50">Before Care only(6am to 9am)</option>                              <option value="60">After Care Only (5pm to 7pm)</option>                              <option value="110">Both</option>                              </select>                          </div>应该添加他们的购物车总数 <h4 class="price" id="prictot">{{$cdetail ->c_price}}</h4>         <form action="{{ route('/payment') }}" id="theForm" method="POST">          @csrf          <input type="hidden" id="price" name="price" value="{{$cdetail ->price}}"><br>          <button type="submit" class="btn radius-xl text-uppercase">Buy This Courses</button>         </form>使用ajax并获取值并放入“prictot”<script>$(document).ready(function() {$("#priceadd").on('change', function () {    var optionText = $("#priceadd option:selected").val();     realprice=document.getElementById("prictot").innerHTML    document.getElementById("prictot").innerHTML = optionText });});</script>

Answer 1

select-box您可以简单地获取和的值<h4>并将它们相加，并将总价值放入您的 div 和隐藏的输入中。IE ：

$(document).ready(function() {

//on change of slect

  $("#priceadd").on('change', function() {

  //get select value

    var optionText = parseInt($(this).val());

    //get text inside h4

    var realprice = parseInt($("#prictot").text());

    //add 

    var total =optionText +  realprice;

    //add total to div nd inputs

    $("#prictot").text(total)

    $("#price").val(total)

  });

});

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>

<div class="col-12 col-sm-9 col-md-9 col-lg-8">

  <select class="form-control" id="priceadd">

    <option value="0">Not Required</option>

    <option value="50">Before Care only(6am to 9am)</option>

    <option value="60">After Care Only (5pm to 7pm)</option>

    <option value="110">Both</option>

  </select>

</div>

<h4 class="price" id="prictot">110</h4>

<form action="{{ route('/payment') }}" id="theForm" method="POST">

  @csrf

  <input type="text" id="price" name="price" value="110"><br>

  <button type="submit" class="btn radius-xl text-uppercase">Buy This Courses</button>

</form>

<h4>如果您需要在其值发生更改之前获取内部已经存在的总数，您可以向<h4>标记添加一个自定义属性，该属性将具有以前的值。IE ：

$(document).ready(function() {

//on change of slect

  $("#priceadd").on('change', function() {

    //get old value

    var old_value = parseInt($("#prictot").attr('total-price'))

  //get select value

    var optionText = parseInt($(this).val());

    

    //add 

    var total =optionText +  old_value;

    //add total to div nd inputs

    $("#prictot").text(total)

    $("#price").val(total)

  });

});

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>

<div class="col-12 col-sm-9 col-md-9 col-lg-8">

  <select class="form-control" id="priceadd">

    <option value="0">Not Required</option>

    <option value="50">Before Care only(6am to 9am)</option>

    <option value="60">After Care Only (5pm to 7pm)</option>

    <option value="110">Both</option>

  </select>

</div>

<!--added custom attribute-->

<h4 class="price" total-price="110" id="prictot">110</h4>

<form action="{{ route('/payment') }}" id="theForm" method="POST">

  @csrf

  <input type="text" id="price" name="price" value="110"><br>

  <button type="submit" class="btn radius-xl text-uppercase">Buy This Courses</button>

</form>