I was recently asked by a client to build a form that allows users to sign using a wireless pen mouse. The goal of the client was to obtain user signatures for a report that would be used for a future audit.
At first I was considering building my own signature pad from scratch. However, I didn't have the time to do that. This feature needed to be live in a week. This unfortunately is the reality when working in real life situations. This is why I wanted to write about this specific case. You won't always have the time to build every single feature in an app from scratch. Sometimes you have to rely on libraries created by other developers. This article will help beginners see how you can combine different libraries to create a working product.
OK let start building the signature pad. First I wrote a user story. Below is the user story for what we will be building:
Now that we know what we are building lets start coding it. We can use the user story list items as our milestones.
I will use React for this task, so lets bootstrap the project by using create-react-app.
To do that all we need to do is type the following command on our terminal:
npx create-react-app signature-pad
For more information on create-react-app check out this Github Repo
Once our project is ready, we navigate into our folder and start up our code editor. In my case I am using VS Code.
# navigate to the project folder in your terminal cd signature-pad
command to start VS Code once you are in root folder of the project
Now that we have everything set lets start up our project by typing the following command:
# start project
This is what we should see once the project starts:
If you open up your
App.js file this is what we should see:
Lets get rid of all this code and add the one thing we need. A button that when clicked should open up a popup with a signature pad, per our user story.
This is what our app should look like now:
Our final step for this part of the project is to show a popup when the button is clicked. A good library that can help with this is reactjs-popup. To install it we type
npm install --save reactjs-popup
This library can be used to create Popup Models, Tool-tips, and Nested Menus. In our case we will focus on using it to create Popup Models. For more information on it check out their very helpful documentation page
Once we have the library installed we import it into our
App.js file. Next we add the
Popup component to our render method. This component takes in many props. In our case we focus on two: modal props (by default this is false which results in getting a tool-tip) and the trigger props which takes in a component that will trigger the popup. In our case this is our button that we already created.
Now when we click on the button we should get a popup. the content of the popup will go inside our
This is what we should have now:
We have successfully completed the first part of our User story. Now lets more to the next one!
To build the canvas inside our popup we will be using react-signature-canvas. This is a powerful library that will make working with a signature pad very easy. Specifically when we start thinking about adding features such as clear and save to our pad.
To install it we type:
npm install --save react-signature-canvas
Once we have that installed we import the
SignatureCanvas component and place it inside our
Popup component. That is all!
We now have a canvas inside our popup. This is what the code looks like:
and this is what our app should be showing:
Before we move to the next item in the user story lets add some styling to our canvas. All I will do is give give our canvas a border in order for us to easily identify it and give it a width and height.
SignaturePad component has a prop called
canvasProps which allows us to pass attributes to the canvas. In this case I will give the canvas a class called “signatureCanvas”.
You probably noticed that I am also importing a css file called
sigCanvas.css. This is where I will put all my canvas related styles.
The result should look like this:
OK ready for our final step.
User has the option to exit popup via an ‘Close’ button, clear the canvas via a ‘Clear’ button, or save the signature as an image via the ‘Save’ button.
lets start with the close button. lets add a button with an onClick, inside that onClick will be a way to close the popup. The
reactjs-popup docs recommend providing a function as a child to the
Popup component. this function has a parameter
close that will handle our close event and will return the components that we want inside the popup.
In addition we should not allow users to close the popup except via this button. To do that we need to pass the
closeOnDocumentClick prop and pass it a true value.
This is what our app looks like now:
Next we need a button to clear the canvas.
react-signature-canvas provides several methods that help with manipulating our canvas. In order to use this method we need to get an instant of our canvas. This can be done via React refs.
Let use React Hooks for this. First we create a ref called
useRef hook, the initial value is an empty object. Next we pass this into a
SignaturePad component using a prop called ref. finally we create a function called
clear that will be called anytime the clear button is clicked.
inside the clear function, we simply invoke the method
clear() via our canvas ref
sigCanvas. I realize these are a lot of steps, so I wrote comments in the code shown below:
This is what our app should look like now:
Now for the final button, the save button. This button should simply output a base64 string representing the image. You can use this to store it in a database or instead you can upload the image into your server. In our case we won’t be connecting to any servers, so we will simply log the base64 code to the console.
react-signature-canvas has a method called
getTrimmedCanvas() that can trim the white space from the canvas (to optimize the image) and give back a base64 string representing the image. All this via our
This is what our app should look like now:
Alright! all basic functionalities are complete!
I do want to add one more part to this project. Lets output the saved signature on our screen instead of just logging it.
We can simply add an image tag below our popup button and pass it our image URL. Of course this image URL will be what we logged into the console, so instead of doing that we can store it in state.
This should be the result:
That’s all folks! we successfully completed our user story. Of course there is room to improve but all the basic functionalities are there.
You can play around with the code and add more features to it by following the link
I hope this tutorial will surely help and you if you liked this tutorial, please consider sharing it with others.
Originally published on dev.to
If you are undertaking a mobile app development for your start-up or enterprise, you are likely wondering whether to use React Native. As a popular development framework, React Native helps you to develop near-native mobile apps. However, you are probably also wondering how close you can get to a native app by using React Native. How native is React Native?
In the article, we discuss the similarities between native mobile development and development using React Native. We also touch upon where they differ and how to bridge the gaps. Read on.
Let’s briefly set the context first. We will briefly touch upon what React Native is and how it differs from earlier hybrid frameworks.
Although relatively new, React Native has acquired a high degree of popularity. The “Stack Overflow Developer Survey 2019” report identifies it as the 8th most loved framework. Facebook, Walmart, and Bloomberg are some of the top companies that use React Native.
The popularity of React Native comes from its advantages. Some of its advantages are as follows:
Are you wondering whether React Native is just another of those hybrid frameworks like Ionic or Cordova? It’s not! React Native is fundamentally different from these earlier hybrid frameworks.
React Native is very close to native. Consider the following aspects as described on the React Native website:
Due to these factors, React Native offers many more advantages compared to those earlier hybrid frameworks. We now review them.
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In this post, i will show you how to create digital signature pad in laravel.
Here, i will guide you step by step to create digital signture pad in laravel. So, follow the following steps and create digital signature pad in laravel.
Follow below given steps to create laravel digital signature pad app:
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Since March 2020 reached 556 million monthly downloads have increased, It shows that React JS has been steadily growing. React.js also provides a desirable amount of pliancy and efficiency for developing innovative solutions with interactive user interfaces. It’s no surprise that an increasing number of businesses are adopting this technology. How do you select and recruit React.js developers who will propel your project forward? How much does a React developer make? We’ll bring you here all the details you need.
In context of software developer wage rates, the United States continues to lead. In high-tech cities like San Francisco and New York, average React developer salaries will hit $98K and $114per year, overall.
However, the need for React.js and React Native developer is outpacing local labour markets. As a result, many businesses have difficulty locating and recruiting them locally.
It’s no surprise that for US and European companies looking for professional and budget engineers, offshore regions like India are becoming especially interesting. This area has a large number of app development companies, a good rate with quality, and a good pool of React.js front-end developers.
As per Linkedin, the country’s IT industry employs over a million React specialists. Furthermore, for the same or less money than hiring a React.js programmer locally, you may recruit someone with much expertise and a broader technical stack.
React is a very strong framework. React.js makes use of a powerful synchronization method known as Virtual DOM, which compares the current page architecture to the expected page architecture and updates the appropriate components as long as the user input.
React is scalable. it utilises a single language, For server-client side, and mobile platform.
React is steady.React.js is completely adaptable, which means it seldom, if ever, updates the user interface. This enables legacy projects to be updated to the most new edition of React.js without having to change the codebase or make a few small changes.
React is adaptable. It can be conveniently paired with various state administrators (e.g., Redux, Flux, Alt or Reflux) and can be used to implement a number of architectural patterns.
Is there a market for React.js programmers?
The need for React.js developers is rising at an unparalleled rate. React.js is currently used by over one million websites around the world. React is used by Fortune 400+ businesses and popular companies such as Facebook, Twitter, Glassdoor and Cloudflare.
As you’ve seen, locating and Hire React js Developer and Hire React Native developer is a difficult challenge. You will have less challenges selecting the correct fit for your projects if you identify growing offshore locations (e.g. India) and take into consideration the details above.
If you want to make this process easier, You can visit our website for more, or else to write a email, we’ll help you to finding top rated React.js and React Native developers easier and with strives to create this operation
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In this article, you will learn what are hooks in React JS? and when to use react hooks? React JS is developed by Facebook in the year 2013. There are many students and the new developers who have confusion between react and hooks in react. Well, it is not different, react is a programming language and hooks is a function which is used in react programming language.
Read More:- https://infoatone.com/what-are-hooks-in-react-js/
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The most awaited version of React 18 is finally out now. Its team has finally revealed the alpha version of React 18 and its plan, though the official launch is still pending. This time the team has tried something and released the plan first to know their user feedback because the last version of React 17 was not that much appreciated among developers.
According to Front-end Frameworks Survey, React JS has ranked top in the list of most loved frameworks. Thus, the developer communities expect a bit higher from the framework, so they are less appreciative of the previous launch.
So, this time React 18 will be a blast. For beginners, the team is working on a new approach. They have called a panel of experts, library authors, educators, and developers to take part in a working group. Initially, it will be a small group.
I am not a part of this release but following the team on their GitHub discussion group. After gathering the information from there, I can say that they have planned much better this time.
React 17 was not able to meet the developer's community. The focus was all primarily centered on making it easier to upgrade React itself. React 18 release will be the opposite. It has a lot of features for react developers.
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