为什么在调用该函数时未调用AJAX函数并且未打印警报？ [英] Why the AJAX function is not getting called and alert is not getting printed upon calling the function?

问题描述

我想在用户单击选择控件或选择控件从键盘将焦点转移到自己后调用ajax函数。

I want to call the ajax function once user clicks on the select control or the select control gets focus to itself from keyboard.

HTML代码如下：

<select id="scanner" name="scanner" class="form-control"></select>

我编写的jQuery-AJAX函数如下，但aler（ Hello）没有得到打印。为什么这样？

The jQuery-AJAX function I wrote is as follows but the aler("Hello") is not getting printed. why so?

 $("#scanner").bind("change",function() { alert("Hello");

    var mod_url = $('#mod_url').val(); 

    $.ajax({
      url : mod_url,
      cache: false,
      dataType: "json",
      type: "GET",
      async: false,
      data: {
        'request_type':'ajax', 
        'op':'get_all_stores'
      },
      success: function(result, success) { alert(result);
        $('#scanner').html(result);
      },
      error: function() {
        alert("Error is occured");
      }
    });
  });

推荐答案

在您的代码中我没有看到任何选项用于HTML 选择框

In your code i haven't seen any options for html select box

而且，您已经在 select 框上注册了更改事件，该事件仅在选择选择框中的选项

And, you have registered a change event on select box which will occur only on selecting the options in select box

添加一些选项，然后尝试选择将触发ajax调用的选项

Add few options in select box and try to select options which will fire the ajax call

请参见 此处的JS

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