[英]Learning to use namespaces and modules in Javascript
因此,我在jsfiddle中有一个需要帮助的示例。 我有一个html形式的表格,以及我想用来填充的数据。 我将执行此操作的逻辑封装在我认为是正确的名称空间定义中,但是JsHint认为不是,是的,我的数据未在表单控件中呈现。 希望能为您解决这个问题提供一些帮助。 绝对不使用Jquery,因为我为此仅使用Ext.js库。 提前致谢。
[JSFiddle链接到我的示例] [1]
var data = {
Tasks = [{
"taskid": 1,
"author": "Bill Maher",
"description": "Purple Rain purple",
"dateCreated": "12/23/2013",
"dataModified": "2/23/2013",
"dueDate": "2/30/2014",
"status": "in progress"
}, {
"taskid": 2,
"author": "Seth Green",
"description": "I am not certain this is needed",
"dateCreated": "3/24/2011",
"dataModified": "",
"dueDate": "5/3/2011",
"status": "completed"
}, {
"taskid": 3,
"author": "Arnold Schwatsheneggar",
"description": "I would of course like to have data to test with",
"dataModified": "",
"dueDate": "",
"status": "in progress"
}, {
"taskid": 4,
"author": "Lilly blue",
"description": "make the sun shine high again",
"dateCreated": "4/12/2014",
"dataModified": "",
"dueDate": "5/10/2014",
"status": "started"
}, {
"taskid": 5,
"author": "Sam Raj",
"description": " when will I see you again",
"dateCreated": "",
"dataModified": "",
"dueDate": "",
"status": "in progress"
}, {
"taskid": 6,
"author": "Kate Kurtmann",
"description": "Show me that you love me. See ya!",
"dateCreated": "",
"dataModified": "",
"dueDate": "",
"status": "in progress"
}, {
"taskid": 7,
"author": "Kristen BenBazza",
"description": "I am a real American",
"dateCreated": "3/4/2013",
"dataModified": "12/3/14",
"dueDate": "5/23/2014",
"status": "in progress"
}, {
"taskid": 8,
"author": "Venkat Shack",
"description": "You are the bravest of hearts, you are the strongest of souls",
"dateCreated": "12/1/2001",
"dataModified": "12/12/2003",
"dueDate": "7/6/2003",
"status": "started"
}, {
"taskid": 9,
"author": "Sunny Chan",
"description": "WHat the f is FADs anyway",
"dateCreated": "12/1/2011",
"dataModified": "3/12/2013",
"dueDate": "10/10/2014",
"status": "completed"
}, {
"taskid": 10,
"author": "William Rolloff",
"description": "Accounting for the costs improving care",
"dateCreated": "2/12/2013",
"dataModified": "12/01/2014",
"dueDate": "10/15/2015",
"status": "completed"
}, {
"taskid": 11,
"author": "Aakash Khandari",
"description": "Making a move to a better life and career",
"dateCreated": "4/3/2000",
"dataModified": "4/7/2005",
"dueDate": "7/17/2014",
"status": "in progress"
}
]
};
// more code goes here but has been deleted for brevity
//revealing public API
return {
exporter.tracy: {//namespace definition
data = data,
trainingTask: {//second namespace
add = addTask,
update = UpdateTask,
load = loadDetail,
clearDetail = clearForm,
save = SubmitTask,
remove = deleteRecord,
expandGroup = groupexpand,
collapseGroup = groupcollapse,
toggleGroup = toggleGroup,
fillMenu = fillMenu,
setGroupStyle = setGroupStyle,
isGrouped = isGrouped
};
};
};
};
/*ending of the module*/
}(this)); //close tracy.trainingtask
您将在闭包(自执行的匿名函数)中声明和定义TaskSetJson
,这对于模块化代码是正确的。
但是您忘记了将其公开。
您可以使用RMP(显示模块模式),如下所示:
tracy = (function() {
var foo = function(a,b,c) { ... };
var var = function(e,f,g) { ... };
var private_value = 1;
var public_value = 2;
// "Reveal" the public parts of your module
return {
foo: foo,
var: var,
public_value: public_value
};
})();
通过这种模式,您的变量和函数在闭包(匿名函数)中声明。 因此,它们仅在该闭包内部可用。 但是您可以通过返回它们使它们在闭包之外可用。
如果要在保存var的地方扩展现有的全局变量,而不是返回模块的显示部分,则可以将其传递给自执行函数,然后直接附加到它:
(function(tracy) {
var foo = function(a,b,c) { ... };
var var = function(e,f,g) { ... };
var private_value = 1;
var public_value = 2;
// "Reveal" the public parts of your module
tracy = {
foo: foo,
var: var,
public_value: public_value
};
})();
这两个示例有些不同,但是在两种情况下,您都可以调用tracy.foo
, tracy.var
或访问tracy.public_value
。
第一个示例更加灵活,因为您可以获得模块的几个独立实例,并将它们存储在不同的变量中。
var
声明一个变量,可以选择将其初始化为一个值。 报价mdn :
用var声明的变量的范围是其当前的执行上下文,它是封闭的函数,或者对于在任何函数外部声明的变量,是全局函数。
在您的jsfiddle中,您似乎期望可以访问在函数内部定义的变量,但这是不可能的。
我本来要拨弄你的小提琴的,但是它很大。 这是一个使用“命名空间”的小例子,请记住,这样做的目的是不污染全局范围 :
(function(export) {
var some_private_variable;
var some_other_private_variable;
function loadDetail () {
}
var taskSet = [{
//a task
}];
export.Tracy = {
trainingTask: {
load: loadDetail,
add: addTask
},
TaskSet: taskSet
};
})(this);
由于this
是执行时的全局对象(窗口),因此export
是窗口对象。 因此,您可以稍后按以下方式使用它:
Tracy.trainingTask.load(..)
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