html - 使用 jquery 在更改选择框选项时更改标签文本？

Question

我有一个带有多个选项的选择框，我想根据选择框选项更改其他标签文本。我有 3 个标签 WEIGHT(KG)/CARGO VALUE/NO 的值。 OF SHIPMENT 并且我正在使用 jquery 来更改标签文本，但只有 WEIGHT(KG) 和 CARGO VALUE 正在更改而不是 NO。出货量。

这是更改标签文本的条件。

1. 如果商品是电子商务，则标签文本将为 WEIGHT(KG)。
2. 如果商品是机械或电子产品，则标签文本将为 cargo 值(value)。
3. 其余的所有选项标签文本都将为“否”。出货量。

请帮忙。

$(function() {
  $('#commoditySelect').change(function() {
    if ($('#commoditySelect').val() == 'Ecommerce') {
      $('#commodityLabel').text('WEIGHT (KG)');
    } else if ($('#commoditySelect').val() == 'Machinery' || 'Electronics') {
      $('#commodityLabel').text('CARGO VALUE');
    } else {
      $('#commodityLabel').text('NO. OF SHIPMENT');
    }
  });
});

<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.5.0/css/bootstrap.min.css" integrity="sha384-9aIt2nRpC12Uk9gS9baDl411NQApFmC26EwAOH8WgZl5MYYxFfc+NcPb1dKGj7Sk" crossorigin="anonymous" />
<script src="https://code.jquery.com/jquery-3.5.1.slim.min.js" integrity="sha384-DfXdz2htPH0lsSSs5nCTpuj/zy4C+OGpamoFVy38MVBnE+IbbVYUew+OrCXaRkfj" crossorigin="anonymous"></script>
<script src="https://cdn.jsdelivr.net/npm/popper.js@1.16.0/dist/umd/popper.min.js" integrity="sha384-Q6E9RHvbIyZFJoft+2mJbHaEWldlvI9IOYy5n3zV9zzTtmI3UksdQRVvoxMfooAo" crossorigin="anonymous"></script>
<script src="https://stackpath.bootstrapcdn.com/bootstrap/4.5.0/js/bootstrap.min.js" integrity="sha384-OgVRvuATP1z7JjHLkuOU7Xw704+h835Lr+6QL9UvYjZE3Ipu6Tp75j7Bh/kR0JKI" crossorigin="anonymous"></script>
<div class="container">
  <div class="row">
    <div class="col-6">
      <label>COMMODITY</label>
      <select class="form-control" id="commoditySelect">
        <option value="Ecommerce">E-Commerce</option>
        <option value="Machinery">Machinery</option>
        <option value="Plastics">Plastics</option>
        <option value="Clothing & Textile">Clothing & Textile</option>
        <option value="Eyewear">Eyewear</option>
        <option value="Electronics">Electronics</option>
        <option value="Personal Effects">Personal Effects</option>
        <option value="Automobile Spares">Automobile Spares</option>
        <option value="Food Products">Food Products</option>
        <option value="Livestock Feed">Livestock Feed</option>
        <option value="Cosmetics">Cosmetics</option>
        <option value="Chemicals">Chemicals</option>
        <option value="Pharmaceutical Products">Pharmaceutical Products</option>
        <option value="Fertilizer">Fertilizer</option>
        <option value="Rubber">Rubber</option>
        <option value="Wood">Wood</option>
        <option value="Paper">Paper</option>
        <option value="Printed Material">Printed Material</option>
        <option value="Scrap">Scrap</option>
        <option value="Footwear">Footwear</option>
        <option value="Cement">Cement</option>
        <option value="Ceramic">Ceramic</option>
        <option value="Glass">Glass</option>
        <option value="Metals">Metals</option>
        <option value="General Cargo">General Cargo</option>
      </select>
    </div>
    <div class="col-6">
      <label id="commodityLabel">WEIGHT (KG)</label>
      <input type="text" class="form-control" placeholder="Default Input" />
    </div>
  </div>
</div>

Answer 1

您需要像这样在 elseif 中定义 || => $(this).val() == 'Electronics' 为最后一个 else 触发，以便标签更改为 NO。 OF SHIPMENT 如果没有条件匹配。

此外，您可以简单地使用$(this)，而不是一次又一次地使用#commoditySelect

$(this) refers to the element where the change event is occurring

现场工作演示:

$(function() {
  $('#commoditySelect').change(function() {
    if ($(this).val() == 'Ecommerce') {
      $('#commodityLabel').text('WEIGHT (KG)');
    } else if ($(this).val() == 'Machinery' || $(this).val() == 'Electronics') {
      $('#commodityLabel').text('CARGO VALUE');
    } else {
      $('#commodityLabel').text('NO. OF SHIPMENT');
    }
  });
});

<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.5.0/css/bootstrap.min.css" integrity="sha384-9aIt2nRpC12Uk9gS9baDl411NQApFmC26EwAOH8WgZl5MYYxFfc+NcPb1dKGj7Sk" crossorigin="anonymous" />
<script src="https://code.jquery.com/jquery-3.5.1.slim.min.js" integrity="sha384-DfXdz2htPH0lsSSs5nCTpuj/zy4C+OGpamoFVy38MVBnE+IbbVYUew+OrCXaRkfj" crossorigin="anonymous"></script>
<script src="https://cdn.jsdelivr.net/npm/popper.js@1.16.0/dist/umd/popper.min.js" integrity="sha384-Q6E9RHvbIyZFJoft+2mJbHaEWldlvI9IOYy5n3zV9zzTtmI3UksdQRVvoxMfooAo" crossorigin="anonymous"></script>
<script src="https://stackpath.bootstrapcdn.com/bootstrap/4.5.0/js/bootstrap.min.js" integrity="sha384-OgVRvuATP1z7JjHLkuOU7Xw704+h835Lr+6QL9UvYjZE3Ipu6Tp75j7Bh/kR0JKI" crossorigin="anonymous"></script>
<div class="container">
  <div class="row">
    <div class="col-6">
      <label>COMMODITY</label>
      <select class="form-control" id="commoditySelect">
        <option value="Ecommerce">E-Commerce</option>
        <option value="Machinery">Machinery</option>
        <option value="Plastics">Plastics</option>
        <option value="Clothing & Textile">Clothing & Textile</option>
        <option value="Eyewear">Eyewear</option>
        <option value="Electronics">Electronics</option>
        <option value="Personal Effects">Personal Effects</option>
        <option value="Automobile Spares">Automobile Spares</option>
        <option value="Food Products">Food Products</option>
        <option value="Livestock Feed">Livestock Feed</option>
        <option value="Cosmetics">Cosmetics</option>
        <option value="Chemicals">Chemicals</option>
        <option value="Pharmaceutical Products">Pharmaceutical Products</option>
        <option value="Fertilizer">Fertilizer</option>
        <option value="Rubber">Rubber</option>
        <option value="Wood">Wood</option>
        <option value="Paper">Paper</option>
        <option value="Printed Material">Printed Material</option>
        <option value="Scrap">Scrap</option>
        <option value="Footwear">Footwear</option>
        <option value="Cement">Cement</option>
        <option value="Ceramic">Ceramic</option>
        <option value="Glass">Glass</option>
        <option value="Metals">Metals</option>
        <option value="General Cargo">General Cargo</option>
      </select>
    </div>
    <div class="col-6">
      <label id="commodityLabel">WEIGHT (KG)</label>
      <input type="text" class="form-control" placeholder="Default Input" />
    </div>
  </div>
</div>