Invoking The Save. As Dialog From A Web Page.
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Java. Script. Invoking The Save. As Dialog From A Web Page. Comments. See the instructions in the.
Classical Inheritance in Java. Script. Douglas. Crockfordwww. And you think you're so clever and classless and free— John Lennon. Java. Script is a class- free, object- oriented language, and as such.
This can be. puzzling to programmers trained in conventional object- oriented languages. C++ and Java. Java.
Script's prototypal inheritance has more expressive. Java. Java. Script. Strongly- typed. Loosely- typed. Static. Dynamic. Classical.
Prototypal. Classes. Functions. Constructors. Functions. Methods. Functions. But first, why do we care about inheritance at all? There are primarily two.
The first is type convenience. We want the language system to. Little type- safety is. This is of critical importance in strongly- typed languages.
Java. Script, where object. The second reason is code reuse. It is very common to have a quantity of objects. Classes make it possible to create. It is also common to have objects. Classical inheritance is useful for. To demonstrate this, we will introduce a little sugar.
Classical Inheritance. First, we will make a Parenizor class that will have set and get. String method that will wrap.
The method method takes a method name and a function. So now we can writemy.
Parenizor = new Parenizor(0). String = my. Parenizor. String(); As you would expect, my.
String is . It lets a method. We could. implement promiscuous multiple inheritance in Java.
Script, but for this example. Inheritance. Suppose there is a Number. Value class that has a set. Value. method that checks that the value is a number in a certain range.
We only want. its set. Value and set. Range methods for our ZParenizor. So, we write. ZParenizor. Number. Value, 'set. Value', 'set. Range'); This adds only the requested methods to our class. Parasitic Inheritance. There is another way to write ZParenizor.
Instead of inheriting. Parenizor, we write a constructor that calls.
Parenizor constructor, passing off the result as its own. The constructor. has a larger role in the construction of the object. Notice that the uber. Class Augmentation. Java. Script's dynamism allows us to add or replace methods of an existing class. We can literally extend a class.
Inheritance works retroactively. We call this Class Augmentation. Java's extends, which means something else. Object Augmentation. In the static object- oriented languages, if you want an object which is slightly. In Java. Script. you can add methods to individual objects without the need for additional classes.
Recall that Java. Script objects are like hashtables. If the value is a function, then it becomes. So in the example above, I didn't need a ZParenizor class at all. We can evolve individual instances because the. Sugar. To make the examples above work, I wrote four sugar.
First, the method method, which adds an instance method to. Function. prototype. It takes a name and a function, and.
When I write a method that doesn't need to return. I usually have it return this. It allows for a cascade- style.
Next comes the inherits method, which indicates that one class inherits. It should be called after both classes are defined, but before. We make an instance of the. We also. correct the constructor field, and we add the uber method to. The uber method looks for the named method in its own prototype.
If we are doing Classical Inheritance, then we need to find the. The return statement. The parameters (if.
Unfortunately, the. Finally, the swiss method. Function. method('swiss', function (parent) . We have looked at Classical Inheritance.
Swiss Inheritance, Parasitic Inheritance, Class Augmentation, and Object Augmentation. Classical objects are hard. The only way to add a new member to a hard object is to create a new class. Microsoft Windows 7 Upgrade Advisor Xp.
In Java. Script, objects are soft. A new member can be added to a soft object by simple assignment. Because objects in Java. Script are so flexible, you will want to think. Deep hierarchies are inappropriate. I have been writing Java.
Script. for 1. 4 years now, and I have never once found need to use an uber. The super idea is fairly important in the classical.