如果AngularJS模板else语句 [英] if else statement in AngularJS templates
问题描述
我想在一个AngularJS模板做的条件。我获取来自YouTube API的视频列表。一些影片是16:9的比例,有些是4:3的比例
I want to do a condition in an AngularJS template. I fetch a video list from the Youtube API. Some of the videos are in 16:9 ratio and some are in 4:3 ratio.
我想打一个条件是这样的:
I want to make a condition like this:
if video.yt$aspectRatio equals widescreen then
element's attr height="270px"
else
element's attr height="360px"
我用 NG-重复
迭代的影片。不知道我应该为此做条件:
I'm iterating the videos using ng-repeat
. Have no idea what should I do for this condition:
- 在范围内添加一个功能?
- 请它的模板?
推荐答案
Angularjs(以下1.1.5版本),不提供的if / else
功能。以下是要考虑的几个选项,你想达到什么:
Angularjs (versions below 1.1.5) does not provide the if/else
functionality . Following are a few options to consider for what you want to achieve:
( 跳转到下面的更新(#4)如果你正在使用1.1.5版或更高版本的)
(Jump to the update below (#4) if you are using version 1.1.5 or greater)
可以使用像下面这样。
<div ng-switch on="video">
<div ng-switch-when="video.large">
<!-- code to render a large video block-->
</div>
<div ng-switch-default>
<!-- code to render the regular video block -->
</div>
</div>
2。 NG-隐藏
/的 NG-节目
指令
另外,您还可以使用 NG-显示/ NG隐藏
,但使用这实际上将使这两个大的视频和一个小的视频元素,然后隐藏一个符合 NG-隐藏
的条件,并显示符合 NG-节目
条件之一。因此,在每一页上,你会实际呈现两个不同的元素。
2. ng-hide
/ ng-show
directives
Alternatively, you might also use ng-show/ng-hide
but using this will actually render both a large video and a small video element and then hide the one that meets the ng-hide
condition and shows the one that meets ng-show
condition. So on each page you'll actually be rendering two different elements.
这可以如下使用。
<div ng-class="{large-video: video.large}">
<!-- video block goes here -->
</div>
以上基本上都会添加大视频
css类的div元素,如果 video.large
是truthy
The above basically will add a large-video
css class to the div element if video.large
is truthy.
在上述版本 1.1.5
您可以使用 NG-如果
指令。如果EX pression提供的回报这将消除元素假
并重新插入元素
中的DOM如果EX pression返回真正
。可以如下使用。
In the versions above 1.1.5
you can use the ng-if
directive. This would remove the element if the expression provided returns false
and re-inserts the element
in the DOM if the expression returns true
. Can be used as follows.
<div ng-if="video == video.large">
<!-- code to render a large video block-->
</div>
<div ng-if="video != video.large">
<!-- code to render the regular video block -->
</div>
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