你是否可以在angular2中改变组件属性时以编程方式触发角度变化检测？
@H_301_1@@Component({
selector: 'my-component',})
class MyComponent implements OnChanges {
@Input() message: string;
ngOnChanges(changeRecord) {
for (var change in changeRecord) {
console.log('changed: ' + change);
}
}
doSomething() {
// I want ngOnChanges to be called some time after I set the
// message. Currently it is only called if the host element
// changes the value of [message] on the element.
this.message = 'some important stuff';
}
}
尝试手动调用更改检测或花费大量时间来解决此问题是过度的,为什么不创建一个函数来处理所需的变异并在ngOnChanges和doSomething中调用它？就像是：
@H_301_1@@Component({
selector: 'my-component',})
class MyComponent implements OnChanges {
@Input() message: string;
viewMessage: string;
ngOnChanges(changes: { [propertyName: string]: SimpleChange }) {
for (let propName in changes) {
if (propName === 'message') {
this.updateView(this.message);
}
}
}
doSomething() {
this.viewMessage = 'some important stuff';
}
updateView(message: string) {
this.viewMessage = message;
}
}
因此,viewMessage将是您将使用的属性并控制模板.
