Leveraging Angular 6 Scripts for Implementing reCAPTCHA

I am currently working on implementing reCAPTCHA into my project, but I'm facing some challenges with understanding how to effectively utilize it.

Below is the way I'm importing the script:


public loadScript() {
  let body = <HTMLDivElement>document.body;
  let script = document.createElement('script');
  script.innerHTML = '';
  script.src = 'https://www.google.com/recaptcha/api.js';
  script.async = true;
  script.defer = true;
  body.appendChild(script);
}

After calling this function in the component constructor, the reCAPTCHA is properly rendered and functional. However, I'm unsure of how to obtain a response from it for my backend.

I attempted to use grecaptcha.getResponse(), but sometimes encounter a

ReferenceError: "grecaptcha is not defined"
. How can Typescript recognize what grecaptcha is?

Answer №1

Learn How to Implement Google reCAPTCHA v3 in Angular Versions 4, 5, and 6

Start by registering for a public key on the official Google Recaptcha website

Next, insert the following script file into your Angular project's index.html

    <script src='https://www.google.com/recaptcha/api.js'></script>

Then, add the following tag to your Component file where you intend to use the Captcha feature

<div class="form-group">
    <div id="captcha_element" class="g-recaptcha" 
     [attr.data-sitekey]="siteKeyCaptcha"></div>
</div>

Update your Typescript file with the given code below.

declare var grecaptcha: any;

//declare Variable with the public key provided by Google
siteKeyCaptcha: string = "6LdF6xxxxxxxxxxxxxxxxxxxxxxxxxxxWVT";

//when routing back from the page, we need to render the captcha again
grecaptcha.render('capcha_element', {
  'sitekey': this.siteKeyCaptcha
});

To receive a response from the Captcha upon click, include a callback event as shown below in the HTML

**HTML**
<div class="form-group">
   <div id="capcha_element" class="g-recaptcha" 
   data-callback="getResponceCapcha" [attr.data-sitekey]="siteKeyCaptcha"></div>
</div>

**Typescript**
ngOnInit() {
  //....rest of code....
  window['getResponceCapcha'] = this.getResponceCapcha.bind(this);
}

getResponceCapcha(captchaResponse: string) {
   this.verifyCaptcha(captchaResponse);
}

verifyCaptcha(captchaResponse: string) {
  //you can make an HTTP call from here
}

Visit the example here and access the code here

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