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      1. 是否可以使用 Angular2 有条件地显示元素属性?

        时间:2023-09-08
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                  本文介绍了是否可以使用 Angular2 有条件地显示元素属性?的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!

                  问题描述

                  我有一些代码在元素上使用 Polymer 属性,例如:

                  I have some code that uses Polymer attributes on elements, for example:

                  <paper-drawer-panel force-narrow>

                  聚合物的工作方式是,如果我想禁用该属性,我不能简单地说 force-narrow="false",它必须完全删除.Angular2中有没有办法有条件地删除整个属性?我似乎找不到有关此主题的任何信息.我可以使用 ngIf 并在有和没有属性的情况下重复整个元素,但如果可能的话我宁愿不这样做.谢谢!

                  The way polymer works is that I can't simply say force-narrow="false" if I want to disable the attribute, it has to be removed altogether. Is there a way in Angular2 to conditionally remove the entire attribute? I can't seem to find any information on this topic. I could use ngIf and repeat the entire element with and without the attribute but I would rather not if possible. Thanks!

                  编辑 - 为什么这个问题被标记为重复并关闭?我在有问题的重复帖子之前问了这个问题.天哪,这个网站有时很糟糕.

                  Edit - Why was this question marked and closed as a duplicate? I asked this question a month before the duplicate post in question. God this site sucks sometimes.

                  编辑 2 - 我了解规则,但仍然觉得有权投诉.

                  Edit 2 - I understand the rules, but still feel entitled to complain.

                  推荐答案

                  简单的属性绑定做你想做的事:

                  Simple attribute binding does what you want:

                  [attr.force-narrow]="someField ? true : null" 
                  

                  someFieldfalse 时该属性不会被移除,只有当它为 null

                  the attribute is not removed when someField is false, only when it's null

                  这篇关于是否可以使用 Angular2 有条件地显示元素属性?的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持html5模板网!

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