jquery implements two drop-down boxes to exchange values

With the continuous development of Web front-end technology, jQuery has become one of the indispensable technologies for most websites. Its powerful selector and convenient operation methods have been deeply loved by developers. This article will introduce a jQuery-based implementation method of drop-down box value exchange, which can help us more conveniently interact in web development and improve user experience.

Implementation ideas

The implementation method of exchanging values ​​between two drop-down boxes is mainly to select elements through jQuery and operate the attribute values ​​​​of the elements. We need to select the elements of the two drop-down boxes, obtain their values ​​respectively, and then exchange the values ​​to achieve the exchange. The specific steps are as follows:

1. Select drop-down box elements

First, we need to select the elements of the two drop-down boxes, which can be done by id, class, tag name, etc. Select. In the example of this article, we use id to select two drop-down box elements and store them in the variables $firstSelect and $secondSelect respectively.

2. Get the selected value

Since we need to exchange the selected value, we need to get the current selected value of each drop-down box. You can get the currently selected value through jQuery's val() method and store it in the variables firstVal and secondVal respectively.

3. Exchange values

After obtaining the selected values ​​of the two drop-down boxes, you can exchange them. In the example of this article, we use jQuery's val() method to set the selected value of each drop-down box to achieve exchange.

Implementation code

The following is the sample code for this article, including HTML and jQuery code. The HTML code contains two drop-down boxes and an exchange button, and the jQuery code is responsible for exchanging the selected values ​​of the two drop-down boxes.

HTML code:

   选项1
   选项2
   选项3



   选项4
   选项5
   选项6


交换值

jQuery code:

$(document).ready(function() {

   // 选取元素
   var $firstSelect = $('#firstSelect');
   var $secondSelect = $('#secondSelect');
   var $swapBtn = $('#swapBtn');

   // 交换元素值
   $swapBtn.click(function() {
      // 获取并交换值
      var firstVal = $firstSelect.val();
      var secondVal = $secondSelect.val();
      $firstSelect.val(secondVal);
      $secondSelect.val(firstVal);
   });
});

In this sample code, when the swap button is clicked, we will get the currently selected value of each drop-down box , and exchange them using jQuery's val() method. In this way, the selected values ​​of the two drop-down boxes will be exchanged.

Summary

This article uses a simple example to introduce the implementation method of using jQuery to exchange values ​​between two drop-down boxes. By selecting elements and manipulating element attribute values, we can quickly and easily implement interactive operations and improve user experience. Of course, in actual development, we can also use many other technologies, such as Vue.js, React, etc., to achieve more complex interactive effects.

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