ng2-google-recaptcha

v5.0.0

Published

2 years ago

Angular component implementing Google's reCAPTCHA

Downloads

571

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leewinder

angular2 angular 2 ng2 typescript google recpatcha no captcha gcaptcha grecaptcha

Build Status

Master Branch

Develop Branch

Overview

An Angular module implementing Google's reCAPTCHA that actually works, requires no additional dependancies and only needs a single import.

Dependancies

Currently built against Angular ^5.2.3 and Typescript ^2.6.2

ng2-google-recaptcha has the following additional dependancies

TsLerp: Typescript library for lerping single and multi-sample data sets over time

Installation

Add the package to your 'dependencies' list in package.json and run npm install

"ng2-google-recaptcha": "^5.0.0"

Optionally, you can manually install the package using the npm command line

npm install ng2-google-recaptcha --save

Add ng2-google-recaptcha to both your map and packages structures in systemjs.config.js

var map = {
  ...
  'ng2-google-recaptcha': 'node_modules/ng2-google-recaptcha'
};

var packages = {
  ...
  'ng2-google-recaptcha': { main: 'index.js', defaultExtension: 'js' },
};

Optionally, add the rootDir option to tsconfig.json to make sure TypeScript's default root path algorithm doesn't pull in the node_modules folder

Usage

Importing The 'ng2-google-recaptcha' Module

To use ng2-google-recaptcha, you need to import the Ng2GoogleRecaptchaModule into the relevent module in your application. In the sample application this is done in the entry module - app.module.ts

import { NgModule }      from '@angular/core';
import { BrowserModule } from '@angular/platform-browser';

import { Ng2GoogleRecaptchaModule }  from 'ng2-google-recaptcha';

@NgModule({
    imports: [
        BrowserModule,
        Ng2GoogleRecaptchaModule,
    ],

    bootstrap: [
        AppComponent,
    ],
})
export class AppModule { }

Adding a reCAPTCHA

To add a reCAPTCHA all you need is to link to Google's reCAPTCHA script, a site key, and a response callback.

Add the following to your <head> tag in your main HTML page

<script src="https://www.google.com/recaptcha/api.js?onload=onloadCallback&render=explicit" async defer></script>

The following is the most basic component to implement the reCAPTCHA

@Component({
    template: `<ng2-google-recaptcha 
                  [siteKey]="recaptchaSiteKey" 
                  (onCaptchaComplete)="onCaptchaComplete($event)">
               </ng2-google-recaptcha>`,
})
export class BasicComponent {

	private recaptchaSiteKey = 'YOUR-RECAPTCHA-SITE-KEY-HERE';

	private onCaptchaComplete(response: any) {
        console.log('reCAPTCHA response recieved:');
        console.log(response.success);
        console.log(response.token);
    }
}

Once BasicComponent.onCaptchaComplete is called, the response element will contain the following attributes

success: True is the request succeeded, False otherwise
token: The validation token which can be used to validate the users response
recaptcha: The ng2-google-recpatcha instance this response was generated on

If the users response times out, BasicComponent.onCaptchaComplete will be automatically called with a failed response and a null token, requiring the user to restart the process.

Additional reCAPTCHA Options

When specifying <ng2-google-recaptcha> you can pass through the following additional properties

captchaStyle: An object containing the style of the reCAPTCHA to render (see the code example below)
renderDelay: A delay (in milliseconds) before the reCAPTCHA renders on screen (defaults to 500ms)
recaptchaId: When using multiple reCAPTCHA elements, a unique ID that identifies this element

@Component({
    template: `<ng2-google-recaptcha 
                  
                  [captchaStyle]="recaptchaStyle" 
                  [renderDelay]="delayToRender" 
                  [recaptchaId]="thisRecaptchaId" 
                  
                  [siteKey]="recaptchaSiteKey" 
                  
                  (onCaptchaComplete)="onCaptchaComplete($event)">
                  
               </ng2-google-recaptcha>`,
})
export class BasicComponent {

	private recaptchaSiteKey: string = 'YOUR-RECAPTCHA-SITE-KEY-HERE';

  private delayToRender: number = 1000; // A one second delay before rendering this element
  private thisRecaptchaId: string = 'this-is-my-unique-id'; // ID to uniquely identify this reCAPTCHA
  
  // Style to use - all properties are optional and the style can be ommitted completely
  private recaptchaStyle = {
        theme: 'dark',     // Uses the Dark theme for this reCAPTCHA
        type: 'audio',     // Use the audio version for user verification
        size: 'compact',   // Use the compact style 
        tabindex: 0,       // Tab Index for this element
  };
  
  

	private onCaptchaComplete(response: string) {
        console.log('reCAPTCHA response recieved:');
        console.log(response);
    }
}

Resetting a reCAPTCHA

If you require the user to redo the reCAPTCHA, you can call resetRecaptcha which will reload the reCAPTCHA and call the onCaptchaComplete callback with a null token allowing it to be reset.

@Component({
  // ...
})
export class BasicComponent {

  // How you get hold of the reCAPTCHA instance is up to you
  @ViewChild(CreateRecaptchaComponent)
  private recaptchaInstance: CreateRecaptchaComponent;

  // Function called after we have used the reCAPTCHA token
  private serverResponse() {
    // ...

    // If we received an error requiring the reCAPTCH to be done again,
    // reset the element causing the previous token to be reset
    recaptchaInstance.resetRecaptcha();

    // ...
  }

}

Building and Running the Sample Application

Check out the repository, browse to the './samples' folder and run npm install to install all the required dependancies.

Note: Running npm install on the sample project requires that Python 2.7.x is available on the command line as it runs a couple of Python scripts to correctly set up the npm_modules folder.

ng2-google-recaptcha is developed in Visual Studio Code so once npm install has finished you should be able to open the './samples' folder in VS Code and it will run out of the box (by default it uses lite-server which is installed as part of npm install).

If you are not using Visual Studio Code, browse to the './samples' folder and run tsc to build the application. Then open your local server of choice pointing to ./samples as the root directory.

Change Log

5.0.0

Updated to Angular 5.2.3

4.0.0

Removed dependency on typings
Updated to Typescript ^2.6.2

1.2.0

Updated to Angular ^4.1.3 and Typescript ^2.3.2
[Bug Fix] Changed moduleId from using module.id to __filename #2
[Bug Fix] Delay added before Google reCAPTCHA library is loaded #5

1.1.0

Added ability to reset the reCAPTCH using CreateRecaptchaComponent:resetRecaptcha

1.0.0

Initial release