[SOLVED] Ion-checkbox: How to use indeterminate

Ionic Framework
1

Let’s say I have a boolean variable state in my component, which can be true, false or null. The docs say that ion-checkbox has an indeterminate property. So I tried to use it like this:

<ion-checkbox [indeterminate]="state === null" [(ngModel)]="state"></ion-checkbox>

However, I get following error:

Error: Template parse errors:
Can't bind to 'indeterminate' since it isn't a known property of 'ion-checkbox'.

How can I set indeterminate to true, if state is null?

Thanks.

2

Can you share your package.json?

3

Oh yes, sure:

{
  "name": "foobar",
  "version": "1.2.1",
  "author": "Ionic Framework",
  "homepage": "https://ionicframework.com/",
  "scripts": {
    "ng": "ng",
    "start": "ng serve",
    "build": "ng build",
    "test": "ng test",
    "lint": "ng lint",
    "e2e": "ng e2e",
    "browser": "ionic serve --cordova --platform browser --no-open"
  },
  "private": true,
  "dependencies": {
    "@angular/common": "^7.2.2",
    "@angular/core": "^7.2.2",
    "@angular/forms": "^7.2.2",
    "@angular/http": "^7.2.2",
    "@angular/platform-browser": "^7.2.2",
    "@angular/platform-browser-dynamic": "^7.2.2",
    "@angular/router": "^7.2.2",
    "@ionic-native/app-version": "^5.1.0",
    "@ionic-native/camera": "^5.1.0",
    "@ionic-native/core": "^5.1.0",
    "@ionic-native/file": "^5.1.0",
    "@ionic-native/file-path": "^5.1.0",
    "@ionic-native/file-transfer": "^5.1.0",
    "@ionic-native/geolocation": "^5.1.0",
    "@ionic-native/image-resizer": "^5.3.0",
    "@ionic-native/ionic-webview": "^5.1.0",
    "@ionic-native/launch-navigator": "^5.2.0",
    "@ionic-native/photo-library": "^5.1.0",
    "@ionic-native/splash-screen": "^5.1.0",
    "@ionic-native/sqlite": "^5.1.0",
    "@ionic-native/status-bar": "^5.1.0",
    "@ionic/angular": "^4.0.2",
    "@ionic/storage": "^2.2.0",
    "class-transformer": "^0.2.0",
    "cordova-android": "7.1.4",
    "cordova-browser": "5.0.4",
    "cordova-ios": "5.0.0",
    "cordova-plugin-actionsheet": "^2.3.3",
    "cordova-plugin-add-swift-support": "^1.6.0",
    "cordova-plugin-app-version": "^0.1.9",
    "cordova-plugin-camera": "^4.0.3",
    "cordova-plugin-device": "^2.0.2",
    "cordova-plugin-dialogs": "^2.0.1",
    "cordova-plugin-file": "^6.0.1",
    "cordova-plugin-file-transfer": "^1.7.1",
    "cordova-plugin-filepath": "^1.5.1",
    "cordova-plugin-geolocation": "^4.0.1",
    "cordova-plugin-ionic-keyboard": "^2.1.3",
    "cordova-plugin-ionic-webview": "^3.1.2",
    "cordova-plugin-photo-library": "^2.2.1",
    "cordova-plugin-splashscreen": "^5.0.2",
    "cordova-plugin-statusbar": "^2.4.2",
    "cordova-plugin-whitelist": "^1.3.3",
    "cordova-sqlite-storage": "^3.1.0",
    "core-js": "^2.5.4",
    "hammerjs": "^2.0.8",
    "info.protonet.imageresizer": "^0.1.1",
    "jquery": "^3.3.1",
    "rxjs": "~6.4.0",
    "uk.co.workingedge.phonegap.plugin.launchnavigator": "^5.0.4",
    "zone.js": "~0.8.29"
  },
  "devDependencies": {
    "@angular-devkit/architect": "~0.12.3",
    "@angular-devkit/build-angular": "~0.12.3",
    "@angular-devkit/core": "~7.2.3",
    "@angular-devkit/schematics": "~7.2.3",
    "@angular/cli": "~7.3.3",
    "@angular/compiler": "~7.2.2",
    "@angular/compiler-cli": "~7.2.2",
    "@angular/language-service": "~7.2.2",
    "@ionic/angular-toolkit": "~1.3.0",
    "@types/jasmine": "~2.8.8",
    "@types/jasminewd2": "~2.0.3",
    "@types/jquery": "^3.3.29",
    "@types/node": "~10.12.0",
    "codelyzer": "~4.5.0",
    "jasmine-core": "~2.99.1",
    "jasmine-spec-reporter": "~4.2.1",
    "karma": "~3.1.4",
    "karma-chrome-launcher": "~2.2.0",
    "karma-coverage-istanbul-reporter": "~2.0.1",
    "karma-jasmine": "~1.1.2",
    "karma-jasmine-html-reporter": "^0.2.2",
    "protractor": "~5.4.0",
    "ts-node": "~8.0.0",
    "tslint": "~5.12.0",
    "typescript": "~3.1.6"
  },
  "description": "Ankünder Instaboard",
  "cordova": {
    "plugins": {
      "cordova-plugin-whitelist": {},
      "cordova-plugin-statusbar": {},
      "cordova-plugin-device": {},
      "cordova-plugin-splashscreen": {},
      "cordova-plugin-ionic-keyboard": {},
      "cordova-plugin-file-transfer": {},
      "cordova-plugin-filepath": {},
      "cordova-plugin-file": {},
      "cordova-plugin-camera": {},
      "cordova-plugin-geolocation": {},
      "cordova-sqlite-storage": {},
      "cordova-plugin-app-version": {},
      "cordova-plugin-photo-library": {
        "PHOTO_LIBRARY_USAGE_DESCRIPTION": " "
      },
      "cordova-plugin-ionic-webview": {
        "ANDROID_SUPPORT_ANNOTATIONS_VERSION": "27.+"
      },
      "uk.co.workingedge.phonegap.plugin.launchnavigator": {
        "LOCATION_USAGE_DESCRIPTION": " ",
        "GOOGLE_API_KEY_FOR_ANDROID": "wird unter android eh nicht benutzt",
        "OKHTTP_VERSION": "3.12.0"
      },
      "info.protonet.imageresizer": {}
    },
    "platforms": [
      "android",
      "browser",
      "ios"
    ]
  }
}
4

Ah yes. silly me.
Updated @ionic/angular from from 4.0.2 to 4.1.0. Now it works. Must be a newer feature.

Sorry for the fuzz.

5

yep thats what i figured. good work!