Define class with namespace in Javascript
Refer to qaru.site/questions/12722 / ... ,
// Define a class like this
function Person(name, gender){
// Add object properties like this
this.name = name;
this.gender = gender;
}
// Add methods like this. All Person objects will be able to invoke this
Person.prototype.speak = function(){
alert("Howdy, my name is" + this.name);
}
// Instantiate new objects with 'new'
var person = new Person("Bob", "M");
// Invoke methods like this
person.speak(); // alerts "Howdy, my name is Bob"
How to define namespace ?
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5 answers
You can simply create a new object containing all your classes / functions:
var myNamespace = {};
myNamespace.Person = function (name, gender) {
// Add object properties like this
this.name = name;
this.gender = gender;
}
myNamespace.Person.prototype.speak = function() {
alert("Howdy, my name is" + this.name);
}
// Instantiate new objects with 'new'
var person = new myNamespace.Person("Bob", "M");
// Invoke methods like this
person.speak(); // alerts "Howdy, my name is Bob"
There is an article on MDN explaining the JavaScript namespace .
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I once made an example file (for my own use), so I'll share it here, you might find it useful (warning: it doesn't just contain namespaces):
//http://www.crockford.com/javascript/private.html
//http://www.dustindiaz.com/namespace-your-javascript/
//http://appendto.com/2010/10/how-good-c-habits-can-encourage-bad-javascript-habits-part-1/
//adding the whole shabang to a namespace
var NameSpace = (function (params)
{
//initialising constructor with parameter
//call as "var testObject = new MyConstructor("test");"
//then accessing the public members: "testObject.publicMember = 123;"
function MyConstructor(param, param2)
{
//initialising public instance member variables
//these could also be added by calling "testObject.[newMemberName] = [value];" to create a new property
//can be accessed by private and public methods
this.publicMember = param;
this.secondPublicMember;
//initialising private instance member variables
//private variables can only be added at creation time
//can be accessed by private methods, but not by the object own public methods.
var privateMember = param2;
var secondPrivateMember;
//creates a private function, NOT accessible by public functions (ONLY by internal private and privileged ones)
//has access to all private/public functions and variables?
function PrivateFunction(params)
{
//place code here
//note this notation is short for "var PrivateFunction = function PrivateFunction(params) {};"
}
//creates a privileged function, accessible by all public (and private?) functions
//has access to all private/public functions and variables
this.PrivilegedFunction = function (params)
{
//place code here
};
}
//creating a public function, accessible by calling "testObject.PublicFunction(params)"
//can also be done by calling "testObject.[newFunctionName] = function (params) {};"
//has access to all public members and functions
MyConstructor.prototype.PublicFunction = function (params)
{
//place function code here
};
};
Again, this was just a layout I made for myself using the links mentioned at the top.
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var MYNamespace = MYNamespace|| {};
MYNamespace.MyFirstClass = function (val) {
this.value = val;
this.getValue = function(){
return this.value;
};
}
var myFirstInstance = new MYNamespace.MyFirstClass(46);
alert(myFirstInstance.getValue());
jsfiddle: http://jsfiddle.net/rpaul/4dngxwb3/1/
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