小编gar*_*hdn的帖子

我在尝试使用Angular *ngFor和*ngIf同一个元素时遇到了问题.

当尝试遍历集合中的集合时*ngFor,集合被视为null并因此在尝试访问模板中的属性时失败.

@Component({
  selector: 'shell',
  template: `
    <h3>Shell</h3><button (click)="toggle()">Toggle!</button>

    <div *ngIf="show" *ngFor="let thing of stuff">
      {{log(thing)}}
      <span>{{thing.name}}</span>
    </div>
  `
})

export class ShellComponent implements OnInit {

  public stuff:any[] = [];
  public show:boolean = false;

  constructor() {}

  ngOnInit() {
    this.stuff = [
      { name: 'abc', id: 1 },
      { name: 'huo', id: 2 },
      { name: 'bar', id: 3 },
      { name: 'foo', id: 4 },
      { name: 'thing', id: 5 },
      { …

我想知道如何创建一个响应方块的布局.每个正方形都有垂直和水平对齐的内容.具体示例如下所示......

任何人都可以告诉我如何在我的故事板中隐藏导航栏.我在下面的代码在模拟器中运行时运行正常,但它仍然出现在我的故事板中,这实在令我烦恼,因为它正在弄乱我的图像放置.有人可以帮忙吗？

- (void) viewWillAppear:(BOOL)animated
{
    [super viewWillAppear:animated];
    [self.navigationController setNavigationBarHidden:YES animated:animated];
}

- (void) viewWillDisappear:(BOOL)animated
{
    [super viewWillDisappear:animated];
    [self.navigationController setNavigationBarHidden:NO animated:animated];
}

我现在已经花了好几个小时试图弄清楚如何正确地将URLSearchParams依赖注入到组件中.

在我的boot.ts确保包括HTTP_PROVIDERS- 我老实说甚至不确定它是必需的URLSearchParams.

我还确保我在我的页面中包含http包脚本.

boot.ts

bootstrap(AppComponent, [
  HTTP_PROVIDERS,
  ROUTER_PROVIDERS,
  provide(LocationStrategy, {useClass: HashLocationStrategy}),
  PanelsService,
  FiltersService
])

这是FiltersService我试图注射的地方URLSearchParams.

filter.service.ts

import {Component, Injectable} from 'angular2/core';
import {URLSearchParams} from 'angular2/http';

@Injectable()
export class FiltersService {

  constructor(private _searchParams:URLSearchParams) { }

  setFilter(name, value) {
    this._searchParams.set(name, value);
  }

  getFilter(name) {
    this._searchParams.get(name);
  }
}

URLSearchParams在构造函数中注入会导致错误:

我读过这篇文章,实际上已经几次,无法弄清楚我哪里出错了.

对于它的价值,我在尝试注射时会遇到同样的问题RouteParams.我显然缺少一些基本的东西.

编辑:为了更清楚,这是我的StoriesComponent样子:

import {Component, OnInit} from 'angular2/core';
import {PanelsService} from '../panels/panels.service';
import …

我正在尝试在我的模型中指定查询

$this->db
        ->select('*')
        ->from('library')
        ->where('library.rating >=', $form['slider'])
        ->where('library.votes >=', '1000')
        ->where('library.language !=', 'German')
        ->where('library.available_until >=', date("Y-m-d H:i:s"))
        ->or_where('library.available_until =', "00-00-00 00:00:00")
        ->where('library.release_year >=', $year_start)
        ->where('library.release_year <=', $year_end)
        ->join('rating_repo', 'library.id = rating_repo.id')

所以,我遇到的麻烦就是我的or_where.我希望or仅限于该available_until领域.然而,目前,我得到的结果是德语不是我想要的.如何将我的or_where过滤器限制在该available_until字段中？

我试图将Http服务注入我的服务器时遇到此错误PanelsService.

import {Component} from 'angular2/core';
import {Http} from 'angular2/http';

export class PanelsService {

  constructor(public http:Http) { }

  getPanelFilters() {
    var url = '../../data/panelFilters/' + 13677 + '.json'

    return this.http.get(url)
  }

}

我正试图PanelsService从我的访问SidebarComponent:

import {PanelsService} from '../panels/panels.service';

@Component({
  ....
  providers: [PanelsService]
})

export class SidebarComponent implements OnInit {

  constructor(public panelsService:PanelsService) { }

  ngOnInit() {
    console.log('I am the sidebar component');
  }

}

应该指出的是,我tsconfig.json的行也有:

"emitDecoratorMetadata": true,
"experimentalDecorators": true,

我试过使用这里@Injectable演示但是当我装饰我的类时,我在控制台中出现错误:@Injectable() …

我一直在寻找解决这个问题的时间,但找不到适合我的方法.当我点击我网站上的"注销"时,用户信息仍然可见,并且仍然显示注销按钮.这是代码:

require 'facebook-php-sdk/src/facebook.php';

$facebook = new Facebook(array(
  'appId'  => 'xxxx',
  'secret' => 'xxxx',
));

// Get User ID
$user = $facebook->getUser();
var_dump($user);
if ($user) {
  try {
    // Proceed knowing you have a logged in user who's authenticated.
    $user_profile = $facebook->api('/me');
  } catch (FacebookApiException $e) {
    error_log($e);
    $user = null;
  }
}

// Login or logout url will be needed depending on current user state.

if ($_GET['logout'] == "yes") {
setcookie('fbs_'.$facebook->getAppId(), '', time()-100, '/', 'http://gno.....ment/index.php');
session_destroy();
header("Location: ".$_SERVER['PHP_SELF']."");
}

if …

我在播放本地.wav文件时遇到了一些麻烦.我AVPlayerStatus是打印0,我假设它意味着它还没准备好玩.我似乎无法弄清楚但是说过,这是我第一次尝试使用AVPlayer做任何事情,所以它可能很简单.我很感激任何帮助.这是代码:

我应该补充说我的声音没有播放!

-(void) playWordSound:(UILabel *)label
{
    NSString *path;
    switch (label.tag)
    {
        case 1:
            path = [[NSBundle mainBundle] pathForResource:@"humpty" ofType:@"wav"];
            break;
        case 2:
            path = [[NSBundle mainBundle] pathForResource:@"dumpty" ofType:@"wav"];
            break;
        case 3:
            path = [[NSBundle mainBundle] pathForResource:@"saty" ofType:@"wav"];
            break;
        case 4:
            path = [[NSBundle mainBundle] pathForResource:@"on 2" ofType:@"wav"];
            break;
        case 5:
            path = [[NSBundle mainBundle] pathForResource:@"a 3" ofType:@"wav"];
            break;
        case 6:
            path = [[NSBundle mainBundle] pathForResource:@"wall" ofType:@"wav"];
            break;
    }
    NSURL *url = [NSURL fileURLWithPath:path];
    AVQueuePlayer *player;
    static …

我有许多动画在加载我的根视图控制器时自动启动.这些动画包括在内viewDidLoad.当我导航到我的下一个视图控制器并返回到根视图控制器时,所有动画都已停止.当我按下"主页"按钮然后返回到视图时,会出现相同的行为.

我敢肯定我在这里遗漏了一些非常基本的东西但是会感激任何帮助.谢谢.

编辑1:

- (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
    [self beeBobbing];
    //animate the butterfly oscillating
    [self butterflyOscillate];

}

-(void) beeBobbing
{
    [UIView animateWithDuration:1.0f delay:0 options:(UIViewAnimationOptionCurveEaseInOut | UIViewAnimationOptionRepeat | UIViewAnimationOptionAutoreverse | UIViewAnimationOptionAllowUserInteraction ) animations:^{
        CGPoint bottomPoint = CGPointMake(215.0, 380.0);
        imgBee.center = bottomPoint;
    } completion:^(BOOL finished) {

    }];

}

编辑2:在视图之间切换时,这种类型的动画似乎重新启动:

-(void) animateClouds
{
    [UIView animateWithDuration:30.0f delay:0 options:UIViewAnimationOptionCurveLinear animations:^{
        CGPoint leftScreenCenter = CGPointMake(-420.0, 119.0);
        imgClouds.center = leftScreenCenter; …

为了提供一些上下文，我有一个<video>标记，该标记具有src指向我的 node.js 服务器上的方法的属性。该方法mp4从另一台服务器获取文件，或者更确切地说是文件的一部分mp4，具体取决于Range浏览器指定的HTTP 标头，例如 - Range:bytes=0-。

预期行为（Chrome 行为）

为了防止我的 node.js 服务器从第三方服务器下载整个文件，我实现了大约 5MB 的最大缓冲区，以便一次下载。因此，如果用户发送请求以获取带有标题的视频

GET /play-test/videoId HTTP/1.1
Host: 127.0.0.1:8000
Connection: keep-alive
Pragma: no-cache
Cache-Control: no-cache
Accept-Encoding: identity;q=1, *;q=0
User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_11_0) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/45.0.2454.101 Safari/537.36
Accept: */*
Referer: http://127.0.0.1:8000/movie/99861
Accept-Language: en-US,en;q=0.8,es;q=0.6
Range: bytes=0-

..然后我的服务器将响应

HTTP/1.1 206 Partial Content
X-Powered-By: Express
Content-Range: bytes 0-5000000/415473786
Connection: keep-alive
Accept-Ranges: bytes
Content-Length: 5000001
Content-Type: video/mp4
Date: …