方程两边的单向结合

I was wondering how to use a one way binding on both sides of an equation in the html side of angularjs.

我想知道如何在angularjs的html部分的等式两边使用单向绑定。

Example:

例子:

ng-if="::user.email !== ::vm.loggedInUser.email"

I get this parse error

我得到这个解析错误

Error: [$parse:syntax] Syntax Error: Token ':' not a primary expression at column 17 of the expression [user.email !== ::vm.loggedInUser.email] starting at [::vm.loggedInUser.email)].

错误:[$parse:syntax]语法错误:Token ':'不是表达式第17列的主表达式[user]。电子邮件! = =::vm.loggedInUser。电子邮件]从[::vm.loggedInUser.email)]。

How can I fix this?

我该怎么解决这个问题呢?

1 个解决方案

#1

So there is two possible fixes to this problem: Either you can change the way of seeing the problem and begin seeing two separate exepressions instead of one. The code would be:

因此，这个问题有两种可能的解决方法:要么改变看待问题的方式，开始看到两个独立的exepresence，而不是一个。的代码是:

ng-if="::(user.email !== vm.loggedInUser.email)"

or you keep your mental model and use ng-show instead like:

或者你保持你的思维模式，使用ng-show来代替:

ng-show="::user.email !== ::vm.loggedInUser.email"

Made a plunker to play with, showing the interaction: https://plnkr.co/edit/MPvWVsm4Kkyq9Yq4V0vi?p=preview

做了一个柱塞来玩，显示了交互:https://plnkr.co/edit/mpvvvsm4kkyq9yq4v0vi?

#1