调用嵌套函数onClick事件无法识别嵌套函数

问题描述 投票:2回答:1

在html页面中使用not defined事件调用嵌套函数时,在控制台上获取onClick错误。我尝试在其他帖子上搜索答案,但未能。我认为这是一个范围或关闭问题。但不太确定如何解决它。

我有html拉入外部.js文件,并具有以下功能。我在mySelection1函数中调用主函数checkMySelection。并在mySelection1事件上的主要html上调用onClick中的嵌套函数。目标是根据它们单击的按钮更改currentPage变量(它最初在.js文件的开头声明为全局变量。)

//first function
 function mySelection1() { 
  alert("in mySelection1 function");
  var SubMenu1 = function() {
    currentPage = 1;
    alert("current XML node is " + currentPage);
  };
  var SubMenu2 = function() {
    currentPage = 2;
    alert("current XML node is " + currentPage);   
  };
  var SubMenu3 = function() {
    currentPage = 3;
    alert("current XML node is " + currentPage);   
  };
}
//second function
function checkMySelection() {

  SearchString = window.location.search.substring(1);
  VariableArray = SearchString.split('=');
  mySelection = VariableArray[1];
  console.log(mySelection); 

  switch (mySelection) {
    case '1':
      alert("Case 1");
      mySelection1();
    break;
    case '2':
      //alert("Case 2");
      //mySelection2();
    break;
    default:
      alert("Something went wrong...");
  }
}

<! -- CODE IN HTML BELOW -->

<button id="defaultItem" class="menuItem active" onclick="openItem(event, 'item1'); SubMenu1()">Item 1</button>
          <button class="menuItem" onclick="openItem(event, 'item2'); SubMenu2()">Item 2</button>
          <button class="menuItem" onclick="openItem(event, 'item3'); SubMenu3()">Item 3</button>

看起来嵌套函数完全被忽略了......:/我错过了什么?还有更好的方法吗?

**** UPDATE BELOW ****大家好,看看现代模式解决原始帖子...我开始使用以下代替函数方法中的嵌套函数...

//Using Object Literal Notation
var mySelection1 = {
  mySubMenu1: function() {
    currentPage = 1;
    alert("current XML node is " + currentPage);
  },
  mySubMenu2: function() {
    currentPage = 2;
    alert("current XML node is " + currentPage);   
  },
  mySubMenu3: function() {
    currentPage = 3;
    alert("current XML node is " + currentPage);   
  }
}

我理解调用我必须使用的函数mySelection1.moduleSubMenu1(); mySelection1.moduleSubMenu2();和mySelection1.moduleSubMenu3();我将这些添加到我的html页面按钮...因为我只想要按钮onClick事件。

<button id="defaultItem" class="menuItem active" onclick="openItem(event, 'video'); mySelection1.moduleSubMenu1()">Video</button>
<button class="menuItem" onclick="openItem(event, 'resources'); mySelection1.moduleSubMenu2()">Resources</button>
<button class="menuItem" onclick="openItem(event, 'quick-check'); mySelection1.moduleSubMenu3()">Quick Check</button>

如果我只是使用这个对象,这非常有效...但是,它让我想到了我想要完成的问题(为什么我之前尝试使用嵌套函数)...我怎样才能使同一个var对象可重用? 'currentPage'var索引值必须根据它们来自哪个'卡'而改变(本文评论中的上下文)...我需要另一个具有相同功能的对象才能更改'currentPage'。 ..即

    //Second object needed
    var mySelection2 = {
      mySubMenu1: function() {
        currentPage = 6;
        alert("current XML node is " + currentPage);
      },
      mySubMenu2: function() {
        currentPage = 7;
        alert("current XML node is " + currentPage);   
      },
      mySubMenu3: function() {
        currentPage = 8;
        alert("current XML node is " + currentPage);   
      }
    }

这很好,但问题是我想使用相同的子菜单项,并且他们已经在onClick上有上一个object.function ...

<button id="defaultItem" class="menuItem active" onclick="openItem(event, 'video'); mySelection1.moduleSubMenu1()">Video</button>
<button class="menuItem" onclick="openItem(event, 'resources'); mySelection1.moduleSubMenu2()">Resources</button>
<button class="menuItem" onclick="openItem(event, 'quick-check'); mySelection1.moduleSubMenu3()">Quick Check</button>
javascript html5
1个回答
1
投票

您的代码中有很多未声明的内容,因此调试它有点困难。但是你的语法有一些问题,这是代码。

         //first function
     function mySelection1() {
         alert("in mySelection1 function");

         function SubMenu1() {
             currentPage = 1;
             alert("current XML node is " + currentPage);
         }

         function SubMenu2() {
             currentPage = 2;
             alert("current XML node is " + currentPage);
         }

         function SubMenu3() {
             currentPage = 3;
             alert("current XML node is " + currentPage);
         }
     }
     //second function
     function checkMySelection() {

         SearchString = window.location.search.substring(1);
         VariableArray = SearchString.split('=');
         mySelection = VariableArray[1];
         console.log(mySelection);

         switch (mySelection) {
             case '1':
                 alert("Case 1");
                 mySelection1();
                 break;
             case '2':
                 //alert("Case 2");
                 //mySelection2();
                 break;
             default:
                 alert("Something went wrong...");
         }
     }
     var button1 = document.getElementById("defaultItem");
     button1.addEventListener("click", SubMenu1);
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