javascript - 保存选项表单并传递 JS 变量

Question

我有一个带有单选按钮和列表框的表单。我试图在按下按钮时调用 php 文件，以将所选选项保存到 MySQL 数据库中。我想传递所选选项以及total_cost，这是一个JS变量。

当按下表单提交按钮时，如何将 JS 变量传递给 php 文件？

<form action="saveConfig.php" class="hide-submit" method="post">

<div class="btn-configure step2button">
<span class="pcButtonText">
Save
</span>                                               
</div>


<ul id="radio" class="input-list">
  <li>
    <input id="item-1" name="config-prod" value="1.00" type="radio" onchange="updateTotal();">
    <label for="item-1">Item 1 [£1.00]</label>
  </li>
  <li>
    <input id="item-2" name="config-prod" value="12.34" type="radio" onchange="updateTotal();">
    <label for="item-2">Item 2 [£12.34]</label>
  </li>
  <li>
    <input id="item-3" name="config-prod" value="9.99" type="radio" onchange="updateTotal();">
    <label for="item-3">Item 3 [£9.99]</label>
  </li>
</ul>

<select id="plist" name="partlist" onchange="updateTotal();">
  <option value="99.99">CPU 1</option>
  <option value="123.00">CPU 2</option>
  <option value="250.54">CPU 3</option>
</select>



</form>
<br>
Total: <input id="total" type="text">

JS:

let buildcost = 25.00;

function updateTotal() {
  let radios = document.getElementsByName('config-prod');
  let select = document.getElementById('plist');
  let partcost = 0;

  for (let i = 0, j = radios.length; i < j; i++) {
    if (radios[i].checked) {
      partcost = parseFloat(radios[i].value);
      break;
    }
  }

  partcost += parseFloat(select.options[select.selectedIndex].value);

  let total_cost = buildcost + partcost;
  document.getElementById('total').value = total_cost.toFixed(2);
}

我不知道如何传递变量total_cost。任何建议将不胜感激。

Answer 1

使用它来保存您的更改，然后在 saveConfig.php 中使用 json_decode($_POST) 接收您的数据

<form action="#" class="hide-submit">
<div class="btn-configure step2button">
<span class="pcButtonText">
Save
</span>                                               
</div>

<ul id="radio" class="input-list">
  <li>
    <input id="item-1" name="config-prod" value="1.00" type="radio" onchange="updateTotal();">
    <label for="item-1">Item 1 [£1.00]</label>
  </li>
  <li>
    <input id="item-2" name="config-prod" value="12.34" type="radio" onchange="updateTotal();">
    <label for="item-2">Item 2 [£12.34]</label>
  </li>
  <li>
    <input id="item-3" name="config-prod" value="9.99" type="radio" onchange="updateTotal();">
    <label for="item-3">Item 3 [£9.99]</label>
  </li>
</ul>

<select id="plist" name="partlist" onchange="save();">
  <option value="99.99">CPU 1</option>
  <option value="123.00">CPU 2</option>
  <option value="250.54">CPU 3</option>
</select>
</form>
<br>
Total: <input id="total" type="text">

<script>
function save(){
    $.ajax({
        url : 'saveConfig.php',
        type: "POST",
        data: $('#form').serialize(),
        dataType: "JSON",
        success: function(data)
        {
            alert('saved');            
        },
        error: function (jqXHR, textStatus, errorThrown){
            alert(errorThrown);
        }
    });
}
</script>