Angular 2-如何有条件地向我的组件添加样式? [英] Angular 2 - How do I conditionally add styles to my component?

问题描述

我有一个样式表正确加载的组件，如下所示:

I have a component with a stylesheet that loads correctly like this:

@Component({
  selector: 'open-account',
  styleUrls: ['open-account.component.scss'],
  templateUrl: './open-account.component.html',
})

如果字符串widget=true存在于url中，但无论如何都无法工作，我想有条件地加载另一个样式表.我已经尝试过:

I want to conditionally load another stylesheet if the string widget=true is present in the url but cannot get anyway to work. I have tried:

var stylesArr = ['open-account.component.scss'];
if (window.location.href.indexOf('widget=true') > -1) stylesArr.push('open-account-widget-styles.component.scss');

@Component({
  selector: 'open-account',
  styleUrls: stylesArr,
  templateUrl: './open-account.component.html',
})

和

var stylesArr = ['./open-account.component.scss'];
if (window.location.href.indexOf('widget=true') > -1) stylesArr.push('./open-account-widget-styles.component.scss');

@Component({
  selector: 'open-account',
  styleUrls: stylesArr,
  templateUrl: './open-account.component.html',
})

和

@Component({
  selector: 'open-account',
  styleUrls: ['open-account.component.scss', 'open-account-widget-styles.component.scss'].filter(elem => {
    if (elem === 'open-account.component.scss') return true;
    if (elem === 'open-account-widget-styles.component.scss' && window.location.href.indexOf('widget=true') > -1) return true;
  }),
  templateUrl: './open-account.component.html',
})

并在我的html顶部:

and in at the top of my html:

<style type="text/css" *ngIf="false">
(the 'false' would be a variable, but putting in false doesnt even stop the style from loading)
...
</style>

如何有条件地加载这样的其他样式表?我不确定还可以尝试什么.

What can I do to conditionally load an additional stylesheet like this? Im not sure what else to try.

推荐答案

我发现它起作用的唯一方法是执行以下操作:

The only way I found it works is to do this:

addStyleSheet() {
  var headID = document.getElementsByTagName('head')[0];
  var link = document.createElement('link');
  link.type = 'text/css';
  link.rel = 'stylesheet';
  link.id = 'widget_styles';
  headID.appendChild(link);

  link.href = './app/open-account/open-account-widget-styles.component.css';
}

ngOnInit() {
  this.addStyleSheet();
}

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