Troubleshooting Angular: Understanding the ng-show Parsing Issue

In my index.html file, there is an ng-show attribute on a div that determines which header to display based on user clearances. These clearances are stored in $scope.user.clearance as an array of objects with the 'clearance' key. The structure of $scope.user.clearance is as follows:

[
    {
       'clearance':string
    }
]

The directive that is causing a parse error is:

<div ng-show = "user.clearance &&
        user.clearance.filter(function(e) { return e['clearance'] === 'SUPERADMIN'; }).length > 0" 
        ng-include="'/partials/components/superadmin-header.html'">
</div>

The expression in question is:

user.clearance && user.clearance.filter(function(e) { 
     return e['clearance'] === 'SUPERADMIN'; 
}).length > 0

This expression works perfectly fine in jsfiddle: http://jsfiddle.net/6frqzwee/2/

Any thoughts on why Angular might be struggling with this?

Answer №1

The ng-show directive functions by placing a $watch on the provided expression within the ng-show attribute. If you provide an expression as a string, it will be evaluated against the current scope. However, if you pass a function with an attribute, it will result in an $parse error.

To ensure it works correctly, consider using an Angular filter | which can produce the desired outcome without causing any parsing errors in the HTML.

<div ng-show ="user.clearance &&
    (user.clearance | filter: {clearance: 'SUPERADMIN' }).length > 0" 
    ng-include="'/partials/components/superadmin-header.html'">

In the example above,

(user.clearance | filter: {clearance: 'SUPERADMIN' })
is evaluated within the scope, returning an array of elements that match the value of the clearance property with SUPERADMIN.

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