如何在Javascript中访问函数外部的变量

Question

这是我正在使用的代码：

$(document).ready(function () {

    var TemplateEditor = function () {

        var GroupClassName = 'group';
        var SelectedGroup = 0;

        var BindClicks = function () {
            $('.CriteriaSelections').unbind('click').click(function (event) {
                event.preventDefault();
                if (fnIsTheClickedBoxaGroup($(this))) {
                    TemplateEditor.GroupClicked();
                }
                else {
                    TemplateEditor.CriteriaClicked($(this), SelectedGroup);
                }
            });

            $('.groupselected').unbind('click').click(function (event) {
                event.preventDefault();
                SelectedGroup = $(this).attr('group-'.length);
                TemplateEditor.SelectGroup(SelectedGroup);
            });
        }


        var fnGetGroupID = function (Obj) {
            if (fnIsTheClickedBoxaGroup(Obj) == true) {
                return null;
            }
            else {
                //Get parent which is the group
                var ObjParent = Obj.parent();
                var GID = ObjParent.attr('id').substr('group-'.length);
                return GID;
            }
        }

        var fnIsTheClickedBoxaGroup = function (Obj) {
            var GetClass = Obj.attr('class');
            if (GetClass == GroupClassName) {
                return true;
            }
            else {
                return false;
            }
        }

        return {
            Init: function () {
                BindClicks();
            },
            CriteriaClicked: function (Obj, GroupID) {
                $('<div>').attr({ id: '' }).addClass('selection').text(Obj).appendTo('#group-' + GroupID);
            },
            GroupClicked: function () {

            },
            SelectGroupClicked: function () {

            },
            UpdateTargetPanel: function () {

            }
        };
    } ();
    TemplateEditor.Init();
});

我试图访问此变量：GroupClassName

此变量位于此函数内

var fnIsTheClickedBoxaGroup = function (Obj) {
                var GetClass = Obj.attr('class');
                if (GetClass == GroupClassName) {
                    return true;
                }
                else {
                    return false;
                }
            }

当我运行程序时，它说GroupClassName是未定义的。 我在这里错过了什么吗？

Answer 1

尝试这个

function fnIsTheClickedBoxaGroup(Obj) {
  var GetClass = Obj.attr('class');
  return (GetClass == GroupClassName);
}

Answer 2

您发布的代码正常工作。 在这里试试吧。

我为测试做的唯一更改是在调用fnIsTheClickedBoxaGroup ：

if (fnIsTheClickedBoxaGroup($(this))) {
    alert('fnIsTheClickedBoxaGroup returned true');
    //TemplateEditor.GroupClicked();
}
else {
    alert('fnIsTheClickedBoxaGroup returned false');
    //TemplateEditor.CriteriaClicked($(this), SelectedGroup);
} 

由于此处未显示的内容，您收到错误。 也许您在其他位置使用GroupClassName ？

Answer 3

或者，由于该变量是一个“常量”，只需在TemplateEditor范围之外创建它，就在ready事件中。

Answer 4

$(document).ready(function () {

    var TemplateEditor = (function () {

        var __self = this;

        __self.groupClassName = 'group',
        __self.selectedGroup = 0;

        __self.BindClicks = function () {

            $('.CriteriaSelections').unbind('click').click(function (event) {
                event.preventDefault();
                if (__self.fnIsTheClickedBoxaGroup($(this))) {
                    TemplateEditor.GroupClicked();
                }
                else {
                    TemplateEditor.CriteriaClicked($(this), __self.selectedGroup);
                }
            });

            $('.groupselected').unbind('click').click(function (event) {
                event.preventDefault();
                __self.selectedGroup = $(this).attr('group-'.length);
                TemplateEditor.SelectGroup(__self.selectedGroup);
            });
        }


        __self.fnGetGroupID = function (Obj) {
            if (__self.fnIsTheClickedBoxaGroup(Obj) == true) {
                return null;
            }
            else {
                //Get parent which is the group
                var ObjParent = Obj.parent();
                var GID = ObjParent.attr('id').substr('group-'.length);
                return GID;
            }
        }

        __self.fnIsTheClickedBoxaGroup = function (Obj) {
            var GetClass = Obj.attr('class');
            if (GetClass == __self.groupClassName) {
                return true;
            }
            else {
                return false;
            }
        }

        return {
            Init: function () {
                __self.BindClicks();
            },
            CriteriaClicked: function (Obj, GroupID) {
                $('<div>').attr({ id: '' }).addClass('selection').text(Obj);
                // text return text, don't jQuery object
                $('<div>').appendTo('#group-' + GroupID);
            },
            GroupClicked: function () {

            },
            SelectGroupClicked: function () {

            },
            UpdateTargetPanel: function () {

            }
        };

    }).call({});

    TemplateEditor.Init();
});

Answer 5

如果将其更改为this.GroupClassName它是否this.GroupClassName ？