How to check whether a property exists in a JObject in an Angular App

问题

I need to check whether a given property exists in a JObject, to use with my ng-show directive for my Angular app.

I tried accessing the property using the square brackets syntax:

<li ng-show="@Model["punkt1"] != null">@Model.punkt1</li>

This is an example of a JSON response:

{
  "value": null,
  "editor": {
    "name": "Infobox",
    "alias": "infobox",
    "view": "/App_Plugins/MyGridEditor/infobox.html",
    "render": "/App_Plugins/MyGridEditor/infobox.cshtml",
    "icon": "icon-grid",
    "config": {}
  },
  "active": false,
  "heading": "Toiletter",
  "punkt1": "qwert",
  "punkt2": "qwert"
}

There can be up to 5 properties after the "heading" property and I only need to display the ones that are received, meaning the li elements should be removed or hidden if the property is not present in the JSON response.

My above method still doesn't hide the li elements and I am not able to do any checks on properties that do not exist.

Don't mind the properties before the heading.

回答1:

It should be

<li ng-show="@Model.punkt1">@Model.punkt1</li>

来源：https://stackoverflow.com/questions/46000002/how-to-check-whether-a-property-exists-in-a-jobject-in-an-angular-app