examples(forms): added an example of using template-driven forms

This commit is contained in:
vsavkin 2015-06-05 15:27:25 -07:00
parent e7e82cbee6
commit 3eff7be9a6
3 changed files with 179 additions and 2 deletions

View File

@ -1,6 +1,7 @@
import {Directive} from 'angular2/angular2';
import {ControlDirective} from './control_directive';
import {ControlValueAccessor} from './control_value_accessor';
import {isBlank} from 'angular2/src/facade/lang';
/**
* The default accessor for writing a value and listening to changes that is used by a
@ -34,7 +35,7 @@ import {ControlValueAccessor} from './control_value_accessor';
}
})
export class DefaultValueAccessor implements ControlValueAccessor {
value = null;
value: string = null;
onChange: Function;
onTouched: Function;
@ -44,7 +45,7 @@ export class DefaultValueAccessor implements ControlValueAccessor {
cd.valueAccessor = this;
}
writeValue(value) { this.value = value; }
writeValue(value) { this.value = isBlank(value) ? "" : value; }
registerOnChange(fn): void { this.onChange = fn; }

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@ -0,0 +1,19 @@
<!doctype html>
<html>
<head>
<title>Template Driven Forms</title>
<style>
.ng-touched.ng-invalid {
border-color: red;
}
</style>
</head>
<body>
<template-driven-forms>
Loading...
</template-driven-forms>
$SCRIPTS$
</body>
</html>

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@ -0,0 +1,157 @@
import {bootstrap, onChange, NgIf, Component, Directive, View, Ancestor} from 'angular2/angular2';
import {
formDirectives,
ControlDirective,
Validators,
TemplateDrivenFormDirective
} from 'angular2/forms';
import {ObservableWrapper} from 'angular2/src/facade/async';
import {RegExpWrapper, print, isPresent} from 'angular2/src/facade/lang';
import {reflector} from 'angular2/src/reflection/reflection';
import {ReflectionCapabilities} from 'angular2/src/reflection/reflection_capabilities';
/**
* A domain model we are binding the form controls to.
*/
class CheckoutModel {
firstName: string;
middleName: string;
lastName: string;
creditCard: string;
amount: number;
email: string;
comments: string;
}
/**
* Custom validator.
*/
@Directive({selector: '[credit-card]'})
class CreditCardValidator {
constructor(c: ControlDirective) {
c.validator = Validators.compose([c.validator, CreditCardValidator.validate]);
}
static validate(c): StringMap<string, boolean> {
if (isPresent(c.value) && RegExpWrapper.test(new RegExp("^\\d{16}$"), c.value)) {
return null;
} else {
return {"invalidCreditCard": true};
}
}
}
/**
* This is a component that displays an error message.
*
* For instance,
*
* <show-error control="creditCard" [errors]="['required', 'invalidCreditCard']"></show-error>
*
* Will display the "is required" error if the control is empty, and "invalid credit card" if the
* control is not empty
* but not valid.
*
* In a real application, this component would receive a service that would map an error code to an
* actual error message.
* To make it simple, we are using a simple map here.
*/
@Component({selector: 'show-error', properties: ['controlPath: control', 'errorTypes: errors']})
@View({
template: `
<span *ng-if="errorMessage !== null">{{errorMessage}}</span>
`,
directives: [NgIf]
})
class ShowError {
formDir;
controlPath: string;
errorTypes: List<string>;
constructor(@Ancestor() formDir: TemplateDrivenFormDirective) { this.formDir = formDir; }
get errorMessage() {
var c = this.formDir.form.find(this.controlPath);
for (var i = 0; i < this.errorTypes.length; ++i) {
if (isPresent(c) && c.touched && c.hasError(this.errorTypes[i])) {
return this._errorMessage(this.errorTypes[i]);
}
}
return null;
}
_errorMessage(code) {
var config = {'required': 'is required', 'invalidCreditCard': 'is invalid credit card number'};
return config[code];
}
}
@Component({selector: 'template-driven-forms'})
@View({
template: `
<h1>Checkout Form</h1>
<form (ng-submit)="onSubmit()" #f="form">
<p>
<label for="firstName">First Name</label>
<input type="text" id="firstName" ng-control="firstName" [(ng-model)]="model.firstName" required>
<show-error control="firstName" [errors]="['required']"></show-error>
</p>
<p>
<label for="middleName">Middle Name</label>
<input type="text" id="middleName" ng-control="middleName" [(ng-model)]="model.middleName">
</p>
<p>
<label for="lastName">Last Name</label>
<input type="text" id="lastName" ng-control="lastName" [(ng-model)]="model.lastName" required>
<show-error control="lastName" [errors]="['required']"></show-error>
</p>
<p>
<label for="creditCard">Credit Card</label>
<input type="text" id="creditCard" ng-control="creditCard" [(ng-model)]="model.creditCard" required credit-card>
<show-error control="creditCard" [errors]="['required', 'invalidCreditCard']"></show-error>
</p>
<p>
<label for="amount">Amount</label>
<input type="number" id="amount" ng-control="amount" [(ng-model)]="model.amount" required>
<show-error control="amount" [errors]="['required']"></show-error>
</p>
<p>
<label for="email">Email</label>
<input type="email" id="email" ng-control="email" [(ng-model)]="model.email" required>
<show-error control="email" [errors]="['required']"></show-error>
</p>
<p>
<label for="comments">Comments</label>
<textarea id="comments" ng-control="comments" [(ng-model)]="model.comments">
</textarea>
</p>
<button type="submit" [disabled]="!f.form.valid">Submit</button>
</form>
`,
directives: [formDirectives, CreditCardValidator, ShowError]
})
class TemplateDrivenForms {
model = new CheckoutModel();
onSubmit() {
print("Submitting:");
print(this.model);
}
}
export function main() {
reflector.reflectionCapabilities = new ReflectionCapabilities();
bootstrap(TemplateDrivenForms);
}