更改事件被触发两次而不是一次

Question

我正在处理这个html5文件上传器插件，但它有一个我无法理解和修复的错误。

jsfiddle link

这个插件的想法是一组功能附加到被点击，只有当它有针对性的按钮。

，但是当我在“按钮-1”点击 click事件中，“按钮-2”点击事件已在同一时间，当on change event正在发生触发。我认为改变事件必须被触发两次。

你可以尝试点击上传按钮，看看我的意思。

任何想法这个插件出了什么问题？

(function($){ 

    // Attach this new method to jQuery 
    $.fn.extend({ 

     // This is where you write your plugin's name 
     upload_file_html5: function(options) { 

      // Set the default values, use comma to separate the settings, example: 
      var defaults = { 
       objectSuperparent: '.media' 
      } 

      var options = $.extend(defaults, options); 
      var o = options; 

      var $cm = this.click(function(e){ 

       // <a> button is the object in this case. 
       var object = $(this); 

       // Get other info from the element belong to this object group. 
       var object_href = object.attr('href'); 
       var object_parent = object.parent(); 
       alert($cm.selector); 

       // Trigger the click event on the element. 
       // Due to security policies triggering click on the input type=file is not allowed/supported in some browsers and Opera is one of them. 
       //$('input[type=file]').trigger('click'); // or: 
       $(".upload-file",object_parent).click(); 

       return false; 

      }); 

      // Trigger ajax post when ever the file is changed by the user. 
      var $cm_2 = $(".upload-file").change(function(){ 

       // <input> is the object in this case. 
       var object = $(this); 

       var object_form = object.parent(); 
       var object_superparent = object.parents(o.objectSuperparent); 
       var path_config = $($cm.selector,object_superparent).attr('href'); 
       var path_post = object_form.attr('action'); 

       alert($cm.selector); 
       //alert(path_config); 

       .... 
       .... 

      }); 

     } 
    }); 

})(jQuery); 

Answer 1

检查我的代码的变种：http://jsfiddle.net/es8Vh/3/ 基本jQuery插件结构：

$.fn.pluginName = function() { 
    return this.each(function() { // <-- this is important 
     // code here 
    }); 
};