angular2
Version:
Angular 2 - a web framework for modern web apps
93 lines • 4.07 kB
JavaScript
import { ListWrapper, StringMapWrapper } from 'angular2/src/facade/collection';
import { isBlank, isPresent, looseIdentical } from 'angular2/src/facade/lang';
import { BaseException } from 'angular2/src/facade/exceptions';
import { Validators } from '../validators';
import { DefaultValueAccessor } from './default_value_accessor';
import { NumberValueAccessor } from './number_value_accessor';
import { CheckboxControlValueAccessor } from './checkbox_value_accessor';
import { SelectControlValueAccessor } from './select_control_value_accessor';
import { normalizeValidator } from './normalize_validator';
export function controlPath(name, parent) {
var p = ListWrapper.clone(parent.path);
p.push(name);
return p;
}
export function setUpControl(control, dir) {
if (isBlank(control))
_throwError(dir, "Cannot find control");
if (isBlank(dir.valueAccessor))
_throwError(dir, "No value accessor for");
control.validator = Validators.compose([control.validator, dir.validator]);
control.asyncValidator = Validators.composeAsync([control.asyncValidator, dir.asyncValidator]);
dir.valueAccessor.writeValue(control.value);
// view -> model
dir.valueAccessor.registerOnChange(newValue => {
dir.viewToModelUpdate(newValue);
control.updateValue(newValue, { emitModelToViewChange: false });
control.markAsDirty();
});
// model -> view
control.registerOnChange(newValue => dir.valueAccessor.writeValue(newValue));
// touched
dir.valueAccessor.registerOnTouched(() => control.markAsTouched());
}
export function setUpControlGroup(control, dir) {
if (isBlank(control))
_throwError(dir, "Cannot find control");
control.validator = Validators.compose([control.validator, dir.validator]);
control.asyncValidator = Validators.composeAsync([control.asyncValidator, dir.asyncValidator]);
}
function _throwError(dir, message) {
var path = dir.path.join(" -> ");
throw new BaseException(`${message} '${path}'`);
}
export function setProperty(renderer, elementRef, propName, propValue) {
renderer.setElementProperty(elementRef, propName, propValue);
}
export function composeValidators(validators) {
return isPresent(validators) ? Validators.compose(validators.map(normalizeValidator)) : null;
}
export function composeAsyncValidators(validators) {
return isPresent(validators) ? Validators.composeAsync(validators.map(normalizeValidator)) : null;
}
export function isPropertyUpdated(changes, viewModel) {
if (!StringMapWrapper.contains(changes, "model"))
return false;
var change = changes["model"];
if (change.isFirstChange())
return true;
return !looseIdentical(viewModel, change.currentValue);
}
// TODO: vsavkin remove it once https://github.com/angular/angular/issues/3011 is implemented
export function selectValueAccessor(dir, valueAccessors) {
if (isBlank(valueAccessors))
return null;
var defaultAccessor;
var builtinAccessor;
var customAccessor;
valueAccessors.forEach(v => {
if (v instanceof DefaultValueAccessor) {
defaultAccessor = v;
}
else if (v instanceof CheckboxControlValueAccessor || v instanceof NumberValueAccessor ||
v instanceof SelectControlValueAccessor) {
if (isPresent(builtinAccessor))
_throwError(dir, "More than one built-in value accessor matches");
builtinAccessor = v;
}
else {
if (isPresent(customAccessor))
_throwError(dir, "More than one custom value accessor matches");
customAccessor = v;
}
});
if (isPresent(customAccessor))
return customAccessor;
if (isPresent(builtinAccessor))
return builtinAccessor;
if (isPresent(defaultAccessor))
return defaultAccessor;
_throwError(dir, "No valid value accessor for");
return null;
}
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