190 lines
3.6 KiB
Plaintext
190 lines
3.6 KiB
Plaintext
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p.location-badge.
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exported from <a href='../di'>angular2/di</a>
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defined in <a href="https://github.com/angular/angular/tree/2.0.0-alpha.32/modules/angular2/src/di/binding.ts#L259-L372">angular2/src/di/binding.ts (line 259)</a>
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:markdown
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Helper class for the <a href='bind-function.html'><code>bind</code></a> function.
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.l-main-section
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h2 Members
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.l-sub-section
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h3 constructor
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pre.prettyprint
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code.
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constructor(token: any)
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:markdown
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.l-sub-section
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h3 token
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:markdown
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.l-sub-section
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h3 toClass
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pre.prettyprint
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code.
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toClass(type: Type)
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:markdown
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Binds an interface to an implementation / subclass.
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Because `toAlias` and `toClass` are often confused, the example contains both use cases for
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easy comparison.
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```javascript
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class Vehicle {}
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class Car extends Vehicle {}
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var injectorClass = Injector.resolveAndCreate([
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Car,
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bind(Vehicle).toClass(Car)
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]);
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var injectorAlias = Injector.resolveAndCreate([
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Car,
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bind(Vehicle).toAlias(Car)
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]);
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expect(injectorClass.get(Vehicle)).not.toBe(injectorClass.get(Car));
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expect(injectorClass.get(Vehicle) instanceof Car).toBe(true);
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expect(injectorAlias.get(Vehicle)).toBe(injectorAlias.get(Car));
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expect(injectorAlias.get(Vehicle) instanceof Car).toBe(true);
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```
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.l-sub-section
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h3 toValue
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pre.prettyprint
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code.
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toValue(value: any)
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:markdown
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Binds a key to a value.
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```javascript
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var injector = Injector.resolveAndCreate([
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bind(String).toValue('Hello')
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]);
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expect(injector.get(String)).toEqual('Hello');
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```
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.l-sub-section
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h3 toAlias
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pre.prettyprint
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code.
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toAlias(aliasToken: /*Type*/ any)
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:markdown
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Binds a key to the alias for an existing key.
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An alias means that we will return the same instance as if the alias token was used. (This is
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in contrast to `toClass` where a separate instance of `toClass` will be returned.)
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Becuse `toAlias` and `toClass` are often confused, the example contains both use cases for easy
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comparison.
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```javascript
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class Vehicle {}
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class Car extends Vehicle {}
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var injectorAlias = Injector.resolveAndCreate([
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Car,
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bind(Vehicle).toAlias(Car)
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]);
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var injectorClass = Injector.resolveAndCreate([
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Car,
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bind(Vehicle).toClass(Car)
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]);
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expect(injectorAlias.get(Vehicle)).toBe(injectorAlias.get(Car));
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expect(injectorAlias.get(Vehicle) instanceof Car).toBe(true);
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expect(injectorClass.get(Vehicle)).not.toBe(injectorClass.get(Car));
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expect(injectorClass.get(Vehicle) instanceof Car).toBe(true);
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```
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.l-sub-section
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h3 toFactory
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pre.prettyprint
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code.
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toFactory(factoryFunction: Function, dependencies?: List<any>)
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:markdown
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Binds a key to a function which computes the value.
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```javascript
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var injector = Injector.resolveAndCreate([
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bind(Number).toFactory(() => { return 1+2; }),
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bind(String).toFactory((v) => { return "Value: " + v; }, [Number])
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]);
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expect(injector.get(Number)).toEqual(3);
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expect(injector.get(String)).toEqual('Value: 3');
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```
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