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https://github.com/masroorejaz/react-simple-captcha

A very simple and powerful captcha for ReactJS
https://github.com/masroorejaz/react-simple-captcha

Last synced: about 2 months ago
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A very simple and powerful captcha for ReactJS

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README 

        
# React Simple Captcha



React Simple Captcha is a very powerful, highly customizable and easy to use captcha for React JS. 



 **Install** 

```sh

$ npm install react-simple-captcha

```



**Demo**   

Demo can be seen [here](https://scriptse.com/blog/add-captcha-in-reactjs-application/react-simple-captcha-demo/ "React Simple Captcha Demo").

 

 **Usage Guide** 

 

 
 Just follow these 4 easy steps to use the react simple captcha:


 



   -  **Step 1:**  

  

  Import all functions from react-simple-captcha



  ```sh

import { loadCaptchaEnginge, LoadCanvasTemplate, LoadCanvasTemplateNoReload, validateCaptcha } from 'react-simple-captcha';

```



   -  **Step 2:**  

  

Place **< LoadCanvasTemplate />** or **< LoadCanvasTemplateNoReload />** *(if you do not want 'Reload Captcha' functionality)* in your render code



   ```sh

 render() {

        return (


           

            
);

    };

```



 **OR**

 

   ```sh

 render() {

        return (


            

            
);

    };

```



   -  **Step 3:**  

  

Paste **loadCaptchaEnginge(6)** *(You can change 6 to number of captcha charcters you want)* in **componentDidMount**



   ```sh

 componentDidMount () {

       loadCaptchaEnginge(6); 

    };

```

   -  **Step 4:**  

  

Validate captcha by using **validateCaptcha(user_captcha_value)** 



   

   ```sh

 doSubmit = () => {

   

        let user_captcha_value = document.getElementById('user_captcha_input').value;



        if (validateCaptcha(user_captcha_value)==true) {

            alert('Captcha Matched');

        }



        else {

            alert('Captcha Does Not Match');

        }

    };

```



**OR**  

If you don't want captcha to be reloaded if user enter the wrong value then set second parameter to *false* **validateCaptcha(user_captcha_value, false)**



 

 ```sh

 doSubmit = () => {

    

        let user_captcha_value = document.getElementById('user_captcha_input').value;



        if (validateCaptcha(user_captcha_value, false)==true) {

            alert('Captcha Matched');

        }



        else {

            alert('Captcha Does Not Match');

        }

    };

```



 

### Options



Listed are all the options available for react-simple-captcha



| Name | Description |

| ------ | ------ |

| **< LoadCanvasTemplate />** | It will load the captcha **with 'Reload Captcha'** functionality. Place between your render code, usage example **< LoadCanvasTemplate />** |

| **< LoadCanvasTemplateNoReload />** | It will load the captcha **without 'Reload Captcha'** functionality. Place between your render code, usage example **< LoadCanvasTemplateNoReload />**  |

| **loadCaptchaEnginge(*Number_Of_Captcha_Charcters*);** | Simply paste it in **componentDidMount()**. Pass number of captcha characters you want to display. |

| **validateCaptcha(*User_Submitted_Value*)** | Will return *true* if user submitted value matches with captcha otherwise *false*. Also will reload captcha if user submitted value is *false*  |

| **validateCaptcha(*User_Submitted_Value*, *false*)** | Will return *true* if user submitted value matches with captcha otherwise *false*. Will not reload captcha if user submitted value is *false*  |

  

### Optional Changes

  

    

| **Options** | **All of these changes are optionals** |

| ------ | ------ |

| **< LoadCanvasTemplate reloadText="Reload My Captcha" />** | If you want to change the **"Reload Captcha"** with your own text |

| **< LoadCanvasTemplate reloadColor="red" />** | If you want to change the blue color of **"Reload Captcha"** |

| **< LoadCanvasTemplate reloadText="Reload My Captcha" reloadColor="red" />** | If you want to change the **"Reload Captcha"** text and it's blue color |

|  **loadCaptchaEnginge(*Number_Of_Captcha_Charcters*, *Background_Color*);**  | If you want to change the background color from black to your custom color. Example Syntax to change the background color to red use: **loadCaptchaEnginge(6,'red');** |

|  **loadCaptchaEnginge(*Number_Of_Captcha_Charcters*, *Background_Color*, *Font_Color*);**  | If you want to change the font color from white to your custom color. Example Syntax to change the font color to blue use: **loadCaptchaEnginge(6,'','blue');** |

|  **loadCaptchaEnginge(*Number_Of_Captcha_Charcters*, *Background_Color*, *Font_Color*);**  | If you want to change the both background and font color. Example Syntax to change the background color to white and font color to black use: **loadCaptchaEnginge(6,'white','black');** |

|  **loadCaptchaEnginge(*Number_Of_Captcha_Charcters*, *Background_Color*, *Font_Color*, *Upper_Characters_Only*);**  | If you want only upper characters and numbers use **loadCaptchaEnginge(6,'','','upper');** |

|  **loadCaptchaEnginge(*Number_Of_Captcha_Charcters*, *Background_Color*, *Font_Color*, *Lower_Characters_Only*);**  | If you want only lower characters and numbers use **loadCaptchaEnginge(6,'','','lower');** |

|  **loadCaptchaEnginge(*Number_Of_Captcha_Charcters*, *Background_Color*, *Font_Color*, *Numbers*);**  | If you want only numbers use **loadCaptchaEnginge(6,'','','numbers');** |

|  **loadCaptchaEnginge(*Number_Of_Captcha_Charcters*, *Background_Color*, *Font_Color*, *Special_Characters*);**  | If you want only special characters use **loadCaptchaEnginge(6,'','','special_char');** |

 

### Example

Let's create a class name **CaptchaTest** with react simple captcha functionality:



 ```sh

import React, { Component } from 'react';

import { loadCaptchaEnginge, LoadCanvasTemplate, LoadCanvasTemplateNoReload, validateCaptcha } from 'react-simple-captcha';



class CaptchaTest extends Component {



    componentDidMount () {

       loadCaptchaEnginge(6); 

    };



    doSubmit = () => {

        let user_captcha = document.getElementById('user_captcha_input').value;



        if (validateCaptcha(user_captcha)===true) {

            alert('Captcha Matched');

            loadCaptchaEnginge(6); 

            document.getElementById('user_captcha_input').value = "";

        }



        else {

            alert('Captcha Does Not Match');

            document.getElementById('user_captcha_input').value = "";

        }

    };

 

    render() {

         



        return (


            


                



                    


                        

                    



                    


                        


                    



                    


                        
 this.doSubmit()}>Submit


                    


                      

                



            


        
);

    };

}



export default CaptchaTest;

```

Import **CaptchaTest** in index.js

 ```sh

import CaptchaTest from './captcha_test'; 

```

Now replace **ReactDOM.render** with

 ```sh

ReactDOM.render(, document.getElementById('root'));

```

### Common Issues  



**Not Woking on ReactJS Version 18^**  

Solution Here: https://github.com/masroorejaz/react-simple-captcha/issues/23  



**Not Woking on Next.js**  

Solution Here: https://github.com/masroorejaz/react-simple-captcha/issues/32  



**Not Woking with TypeScript**  

Solution Here: https://github.com/masroorejaz/react-simple-captcha/issues/33  



### Support Me  

https://www.buymeacoffee.com/masroorejaz



### Browser support

Works in every modern browser which has support for [canvas element](https://caniuse.com/canvas-text "canvas element").



### License

react-simple-captcha is licensed under the [MIT license](https://opensource.org/licenses/MIT "MIT license").



### Developer Profile

 

**Name:** Masroor Ejaz  

**Linkedin:** https://www.linkedin.com/in/masroorejaz/  

**Twitter:** https://twitter.com/masroorejaz  

**Note:** Feel free to contact me if you have any questions!