Widget 的两个实例只有一个实例在工作

Question

我有一个只适用于一个实例的小部件。

我遇到的问题是，如果我在页面上有一个小部件实例，它就可以正常工作。如果页面上有多个实例，则只有一个实例有效。第二个实例不起作用...

您可以查看此页面以获取示例 http://fullylinked.com/advert.php

从我的故障排除中，我注意到以下几点 1. 第二个实例的展示位置ID 没有传递给脚本。 2. 即使使用默认展示位置 ID，我也会收到一条错误消息 "Uncaught ReferenceError: jsonpCallback is not defined"。不幸的是，jsonpCalback 被定义了，因为第一个脚本有效..

请这是我的代码.. 小工具...

<script placementID = "37"     src="placement.js" type="text/javascript">    </script> 
<div id="widget-container_37"></div>

---- 这条线下面的第二个实例--------

<script placementID = "36" src="placement.js" type="text/javascript"></script><div id="widget-container_36"></div>

现在是 .JS 文件

(function() {
 // Localize jQuery variable
var jQuery;

/******** Load jQuery if not present *********/
if (window.jQuery === undefined || window.jQuery.fn.jquery !== '1.4.2') {
var script_tag = document.createElement('script');
script_tag.setAttribute("type","text/javascript");
script_tag.setAttribute("src",
    "http://ajax.googleapis.com/ajax/libs/jquery/1.4.2/jquery.min.js");
if (script_tag.readyState) {
  script_tag.onreadystatechange = function () { // For old versions of IE
      if (this.readyState == 'complete' || this.readyState == 'loaded') {
          scriptLoadHandler();
      }
  };
} else {
  script_tag.onload = scriptLoadHandler;
}
// Try to find the head, otherwise default to the documentElement
(document.getElementsByTagName("head")[0] || document.documentElement).appendChild(script_tag);
} else {
// The jQuery version on the window is the one we want to use
jQuery = window.jQuery;
main();
}

/******** Called once jQuery has loaded ******/
function scriptLoadHandler() {
// Restore $ and window.jQuery to their previous values and store the
// new jQuery in our local jQuery variable
jQuery = window.jQuery.noConflict(true);
// Call our main function
main(); 
}

/******** Our main function ********/
function main() { 
jQuery(document).ready(function($) { 
    /******* Load CSS *******/
   /** var css_link = $("<link>", { 
        rel: "stylesheet", 
        type: "text/css", 
        href: "style.css" 
    });
    css_link.appendTo('head');  
   /**** get host name ***/
  var site_name = window.location.hostname;


    /****** get user ID******/
  var this_js_script = $('script[src*=placement]'); // get file name..*/
  var placementID = this_js_script.attr('placementID');  
  /**var placementID = document.getElementById("adblabla_2").getAttribute("placementID");**/
  if (typeof placementID === "undefined" ) {
     var placementID = '23';

  }

    /******* Load HTML *******/

  $.ajax({
        url: 'processors/processor.php?placementID='+placementID,
        data: {name: 'Chad', site: site_name},
        dataType: 'jsonp',
        jsonp: 'callback',
        jsonpCallback: 'jsonpCallback',
        success: function(data){
           //alert(placementID);
           $('#widget-container_'+placementID).html(data.message);

        }
    });


});
  function jsonpCallback(data){
 $('#widget-container_2').text(data.message);

 }

}

})();

Answer 1

另一个原因我想，你的代码已经被封装了，所以它没有调用两次相同的主函数，而是找到了两次相同的脚本标签，因此我认为得到了错误的参数。 http://www.2ality.com/2014/05/current-script.html 那么你可以试试这个代码：

(function () {
    // Localize jQuery variable
    var jQuery,
        //get current script
        currentScript = document.currentScript || (function () {
            var scripts = document.getElementsByTagName('script');
            return scripts[scripts.length - 1];
        })();

    /******** Load jQuery if not present *********/
    if (window.jQuery === undefined || window.jQuery.fn.jquery !== '1.4.2') {
        var script_tag = document.createElement('script');
        script_tag.setAttribute("type", "text/javascript");
        script_tag.setAttribute("src",
            "http://ajax.googleapis.com/ajax/libs/jquery/1.4.2/jquery.min.js");
        if (script_tag.readyState) {
            script_tag.onreadystatechange = function () { // For old versions of IE
                if (this.readyState == 'complete' || this.readyState == 'loaded') {
                    scriptLoadHandler();
                }
            };
        } else {
            script_tag.onload = scriptLoadHandler;
        }
// Try to find the head, otherwise default to the documentElement
        (document.getElementsByTagName("head")[0] || document.documentElement).appendChild(script_tag);
    } else {
// The jQuery version on the window is the one we want to use
        jQuery = window.jQuery;
        main();
    }

    /******** Called once jQuery has loaded ******/
    function scriptLoadHandler() {
// Restore $ and window.jQuery to their previous values and store the
// new jQuery in our local jQuery variable
        jQuery = window.jQuery.noConflict(true);
// Call our main function
        main();
    }

    /******** Our main function ********/
    function main() {
        jQuery(document).ready(function ($) {
            /******* Load CSS *******/
            /** var css_link = $("<link>", {
        rel: "stylesheet",
        type: "text/css",
        href: "style.css"
    });
             css_link.appendTo('head');
             /**** get host name ***/
            var site_name = window.location.hostname;


            /****** get user ID******/
            var this_js_script = $(currentScript); // get file name..*/
            var placementID = this_js_script.attr('placementID');
            /**var placementID = document.getElementById("adblabla_2").getAttribute("placementID");**/
            if (typeof placementID === "undefined") {
                var placementID = '23';

            }

            /******* Load HTML *******/

            $.ajax({
                url: 'processors/processor.php?placementID=' + placementID,
                data: {name: 'Chad', site: site_name},
                dataType: 'jsonp',
                jsonp: 'callback',
                success: function (data) {
                    //alert(placementID);
                    $('#widget-container_' + placementID).html(data.message);

                }
            });


        });
        function jsonpCallback(data) {
            $('#widget-container_2').text(data.message);

        }

    }

})();

PS：在 http://jsfiddle.net/

上构建测试用例时它总是非常有用

Widget 的两个实例只有一个实例在工作

Two instances of Widget Only One Instance Working

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