Angular - 'Could not find HammerJS'
JavascriptAngularMaterial Designhammer.jsJavascript Problem Overview
I'm working on a simple angular project where I am trying to import Material Design into my project but some of the components aren't working properly and a console warning says:
>Could not find HammerJS. Certain Angular Material components may not work correctly.
I have hammerjs
installed and also @angular/material
. How do I resolve this issue?
Sidenote
It may be worth noting that if you have hammerjs
installed and your components are still not rendering correctly to make sure you are using angular material
components and not html elements with materialize-css
classes.
If you are using materialize-css
instead of angular material
, you will need to add it to your project separately.
Javascript Solutions
Solution 1 - Javascript
In your package.json
file add this to dependencies
> "hammerjs": "^2.0.8",
Or if you want an alternative automatic way just you can type npm i hammerjs --save
(or npm i [email protected] --save
if you want, since 2.0.8
is the latest version nowdays) in your root project folder and test then, if the problem still occurring try to delete the node_modules
folder and reinstall it in the root project folder also by running npm install
which will check the dependencies
(where hammerjs
resides), devDependencies
..., in package.json
file and install them.
Also in your polyfills.ts
(recommended to have a one if you have not)
> import 'hammerjs/hammer';
Thus, it would be found while your angular app is executed since polyfills.ts
itself is called by import (in a normal case, else you can check it) in main.ts
which is the angular apps' entry point.
Solution 2 - Javascript
Install hammerjs
-
with npm
npm install --save hammerjs
-
(or) with yarn
yarn add hammerjs
Then import hammerjs
on your app's entry point (e.g. src/main.ts).
import 'hammerjs';
Solution 3 - Javascript
In your systemjs.config.js
file you also need to add the following entry:
'hammerjs': 'npm:hammerjs/hammer.js',
along with of course:
'@angular/material': 'npm:@angular/material/bundles/material.umd.js',
The other thing that's missing from your code (at least based on what you have in the GH repo) is the inclusion of the Material Design CSS, add this to your index.html
file:
<link href="https://rawgit.com/angular/material2-builds/master/core/theming/prebuilt/indigo-pink.css" rel="stylesheet">
I hope this helps.
Solution 4 - Javascript
this worked for me (and this is with ionic4 as well) I could make hammer.js work - and also ionic with material.angular.io (in the bottom)
Hammer + ionic (hammer + angular as well):
npm install --save hammerjs
npm install --save @types/hammerjs
then
package.json
make sure in dependencies there is this line
"hammerjs": "^2.0.8",
then
tsconfig.json - added types as seen below
"compilerOptions": {
...
...
"types": [
"hammerjs"
]
}
then
in app.component.ts (only there)
import 'hammerjs';
then
in html file (I just took out the first and last < > signs)
div id="myElement"></div
in .ts file
Sample code from hammerjs site works
let element2 = document.getElementById('myElement');
let hamming = new Hammer(element2);
hamming.on("panleft panright tap press pressup", function(ev) {
element2.textContent = ev.type +" gesture detected.";
console.log(ev.type +" gesture detected.");
});
Hammer+ionic+material: to make material hammer work with ionic
in app.module
import { HAMMER_GESTURE_CONFIG } from '@angular/platform-browser';
import { GestureConfig } from '@angular/material';
providers: [
{ provide: HAMMER_GESTURE_CONFIG, useClass: GestureConfig },
]
and voila, your material slider works.
Solution 5 - Javascript
Open your command line or powershell, type the directory of your angular2 project: cd your-project's-root
, hit enter and paste:
npm install hammerjs --save
Npm will automatically add all dependencies into your package.json
file.
Solution 6 - Javascript
-
npm install hammerjs --save
-
npm install @types/hammerjs --save-dev
-
add this to typescript.config under compiler options
"types": [ "hammerjs" ]
-
add this to app.components.ts:
Solution 7 - Javascript
Install with
npm install --save hammerjs
or
yarn add hammerjs
After installing, import it on your app's entry point (e.g. src/main.ts).
import 'hammerjs';
Solution 8 - Javascript
Starting from Angular 9 you need to add HammerModule
to imports
array of your AppModule
. Please, find the example below:
...
import {
BrowserModule,
TransferState,
BrowserTransferStateModule,
HammerModule, // <-- Hammer Module
} from '@angular/platform-browser';
...
@NgModule({
declarations: [
AppComponent,
],
imports: [
HttpClientModule,
AppRoutingModule,
HammerModule, // <-- Hammer Module
],
bootstrap: [AppComponent],
})
export class AppModule { }
Don't forget to do npm install
or yarn add
for adding hammerjs to your project. For a more convenient way, it will be better to install @types/hammerjs
Solution 9 - Javascript
Other than importing hammerJS separately,we can provide this gesture recognition feature to yes while installing angular material(version 8) library with the following command.
npm add @angular/material
Set up HammerJS for gesture recognition?-Yes
Verify the 'hammerjs' is imported into main.ts file