Angular 角度2:组件不';t更新
我正在构建一个关于我所做的一些项目的角度应用程序。我有一个显示项目细节的详细页面 问题: 当我进入项目详细信息页面时,一切都是正确的。 但是当我切换项目变量时(通过使用我在页面上的导航),依赖项组件不会更新,它们不会获得正确的项目ID 包含所有组件的projectdetail.html页面:Angular 角度2:组件不';t更新,angular,components,Angular,Components,我正在构建一个关于我所做的一些项目的角度应用程序。我有一个显示项目细节的详细页面 问题: 当我进入项目详细信息页面时,一切都是正确的。 但是当我切换项目变量时(通过使用我在页面上的导航),依赖项组件不会更新,它们不会获得正确的项目ID 包含所有组件的projectdetail.html页面: <div class="container-content" *ngIf="project"> <div class="projectdetail"> &
<div class="container-content" *ngIf="project">
<div class="projectdetail">
<div class="thumbnail header">
<img [src]="project.img" [alt]="project.name" class="projectImage" />
<div>
<h2>{{project.name}}</h2>
<!--The programming component that you can see in the image-->
<programming-languages [ids]="project.languages"></programming-languages>
</div>
</div>
<div>
<carousel interval="5000" noWrap="false">
<slide *ngFor="let slidez of slides; let index=index">
<img [src]="slidez.image" class="carouselimg" />
<div class="carousel-caption">
<h4>Slide {{slidez.id}}</h4>
<p>{{slidez.text}}</p>
</div>
</slide>
</carousel>
</div>
<div class="thumbnail detail">
<p>{{project.description}}</p>
</div>
</div>
<div class="projects hidden-mm hidden-sm hidden-xs">
<projectsidelist [notShowId]="selectedProjectId"></projectsidelist>
</div>
</div>
import { Component, Input, OnInit } from '@angular/core';
import { ProgrammingLanguagesService } from '../services/programminglanguages.service';
import { ProgrammingLanguage } from '../models/programmingLanguage';
@Component({
selector: 'programming-languages',
templateUrl: 'app/components/programminglanguages.component.html',
providers: [ProgrammingLanguagesService]
})
export class ProgrammingLanguages implements OnInit {
@Input()
ids: number[];
programmingLanguages: ProgrammingLanguage[];
constructor(private programmingLanguagesService: ProgrammingLanguagesService) {
}
getProgrammingLanguages() {
this.programmingLanguagesService.getProgrammingLanguages().subscribe(programmingLanguages => {
var result: ProgrammingLanguage[] = [];
this.ids.forEach((key: number) => {
programmingLanguages.forEach((programmingLanguage: ProgrammingLanguage) => {
if (programmingLanguage.id == key)
{
result.push(programmingLanguage);
}
})
})
this.programmingLanguages = result;
});
}
ngOnInit() {
setTimeout(() => this.getProgrammingLanguages(), 0);
}
}
<div class="languageoverlay">
<span *ngFor="let programmingLanguage of programmingLanguages; let lastElement = last">
<img [src]="programmingLanguage.img" [alt]="programmingLanguage.name" />
<span [hidden]="lastElement" class="languageseperator">+</span>
</span>
</div>
编程语言html:
<div class="container-content" *ngIf="project">
<div class="projectdetail">
<div class="thumbnail header">
<img [src]="project.img" [alt]="project.name" class="projectImage" />
<div>
<h2>{{project.name}}</h2>
<!--The programming component that you can see in the image-->
<programming-languages [ids]="project.languages"></programming-languages>
</div>
</div>
<div>
<carousel interval="5000" noWrap="false">
<slide *ngFor="let slidez of slides; let index=index">
<img [src]="slidez.image" class="carouselimg" />
<div class="carousel-caption">
<h4>Slide {{slidez.id}}</h4>
<p>{{slidez.text}}</p>
</div>
</slide>
</carousel>
</div>
<div class="thumbnail detail">
<p>{{project.description}}</p>
</div>
</div>
<div class="projects hidden-mm hidden-sm hidden-xs">
<projectsidelist [notShowId]="selectedProjectId"></projectsidelist>
</div>
</div>
import { Component, Input, OnInit } from '@angular/core';
import { ProgrammingLanguagesService } from '../services/programminglanguages.service';
import { ProgrammingLanguage } from '../models/programmingLanguage';
@Component({
selector: 'programming-languages',
templateUrl: 'app/components/programminglanguages.component.html',
providers: [ProgrammingLanguagesService]
})
export class ProgrammingLanguages implements OnInit {
@Input()
ids: number[];
programmingLanguages: ProgrammingLanguage[];
constructor(private programmingLanguagesService: ProgrammingLanguagesService) {
}
getProgrammingLanguages() {
this.programmingLanguagesService.getProgrammingLanguages().subscribe(programmingLanguages => {
var result: ProgrammingLanguage[] = [];
this.ids.forEach((key: number) => {
programmingLanguages.forEach((programmingLanguage: ProgrammingLanguage) => {
if (programmingLanguage.id == key)
{
result.push(programmingLanguage);
}
})
})
this.programmingLanguages = result;
});
}
ngOnInit() {
setTimeout(() => this.getProgrammingLanguages(), 0);
}
}
<div class="languageoverlay">
<span *ngFor="let programmingLanguage of programmingLanguages; let lastElement = last">
<img [src]="programmingLanguage.img" [alt]="programmingLanguage.name" />
<span [hidden]="lastElement" class="languageseperator">+</span>
</span>
</div>
+
如果需要额外代码,请询问或参考github
Github包含
运行github时的说明:转到
http://localhost:3000/#/projectdetail/5
然后单击左侧栏上的另一个项目。那你就明白了 您正确地向组件传递了一个id数组,但您从未听过所做的更改,因此有一个快速修复:
在programminglanguages.component.ts中,更改以下代码:
import { Component, Input, OnInit } from '@angular/core';
到
从'@angular/core'导入{Component,Input,OnInit,OnChanges};
及
到
最后,将此生命周期函数添加到类主体:
ngOnChanges(): void {
this.getProgrammingLanguages();
}
您正确地向组件传递了一个id数组,但您从未听过所做的更改,因此有一个快速解决方案: 在programminglanguages.component.ts中,更改以下代码:
import { Component, Input, OnInit } from '@angular/core';
到
从'@angular/core'导入{Component,Input,OnInit,OnChanges};
及
到
最后,将此生命周期函数添加到类主体:
ngOnChanges(): void {
this.getProgrammingLanguages();
}
你能提供更多的代码吗?我明天会做的!:)@AlexanderCiesielski我添加了所有的代码和图像这只是一个没有更新的图像?@FabioAntunes是的,只是一个没有正确更新的图像你能提供更多的代码吗?我明天会做的!)@AlexanderCiesielski我添加了所有的代码和图像只是图像没有更新?@FabioAntunes是的只是图像没有正确更新为什么你要导入
SimpleChanges
,如果你不使用它?这只是更改的类型声明,可能对他来说不是必需的,所以他可以不带参数离开。我在检查值时留下了它:)@MatWaligora我今晚会检查它,希望它能工作:)我从github下载了你的代码并检查了它,为我工作,但正如你所知,“奇怪,它在我的电脑上工作”随时可能发生。如果需要,请告诉我helped@MatWaligora它实际上工作得很好:)Thx你得了50分XD为什么你不使用它就导入SimpleChanges
?这只是更改的类型声明,他可能不需要,这样他就可以不用参数了。我在检查值时留下了它:)@MatWaligora我今晚会检查它,希望它能工作:)我从github下载了你的代码并检查了它,为我工作,但正如你所知,“奇怪,它在我的电脑上工作”随时可能发生。如果需要,请告诉我helped@MatWaligora它实际上工作得很好:)Thx你赢得了50分xD