Easily Build Forms in React Native – React Native Development – Medium

Easily Build Forms in React Native -

  • A few things you might have to take care of… – Creating the necessary components (text inputs, select inputs, checkboxes, switches, etc)Writing/finding validation logicUpdating your components to display any errors (I always forget to do this)Updating your UI whenever you change fieldsNone of these things are difficult, but they can…
  • What We’re BuildingWe’ll be building a sign up form that has the following fields – Email (required)Username (optional)Password (required)Agree to terms (required)Defining the Form ModelThe first thing we need to do is define a model for our form — this is what will be passed to the form component and used to render the…
  • First we need to get the Form component (line 6) then we need to render the form and pass our model to it as the type (line 19).
  • Then pass those options to the Form component – Let’s do the same thing to add some error the Form DesignThe final thing I want to do is modify the design of this form slightly.
  • You can do quite a few things but I’m just going to be changing the label color on this one form.

If you’re building a React Native app it’s almost a guarantee that you’ll have to build at least one form. The reality is you’ll probably build quite a few (sign in, sign up, edit profile, etc.)…
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Creating a chat web app using Express.js, React.js & Socket.io

  • Implementing Send Message functionalityLet’s go back to our Client’s Chat.js Component and add the following functionality to our button:Now let’s create this.sendMessage function:in Constructor add the following:Great.
  • You are now sending the message to the server every time you click ‘Send Message’, and then your message input is cleared so you can write another message.
  • All we have to do now is tell the server to emit the message to everyone who’s socket is connected to our server.In app.js on the server side add the following code:What we are doing here is that we are emiting the info we received from the client (author and…
  • Now all that’s left to do is to catch that emit on the client side and add the message to our messages array.Back in the Chat.js component on the client side add the folloing in the constructor:I will now post how all the files should look like:Chat.jsapp.jsThis function will catch…
  • We already implemented a messages.map functionality so now every time you add a message you should see it in your chat.

In this article I will be creating a chat web app using Express.js, React & Socket.io. I will be using Bootstrap for styling. You will see how the final files should look like in the end. We will now…
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Replacing WebSockets with the Auto-Scaling Firebase Database.

  • A very basic implementation of this object (Which I will refer to as a “packet” moving forward) can be seen below:{ type: “Ping”, sentFrom: “client”}This is a simple “Ping” packet that was sent from the client, which means the server’s database observer should pick it up, but what should this…
  • In order to only get the packets from the client we want we’re going to need their user-id, for this example I’m going to use “abcdefghijklmnop” as the user’s Firebase uid.const ref = packets = .
  • on(“child_added”, handlePacket);This will create an observer for user “abcdefghijklnop” which will listen for all packets “sentFrom” the client.
  • endAt to server so that we make sure that the server and client are listening to each other and not themselves.In the handlePacket function you should immediately remove the packet from the database and then continue using any additional information sent with the packet to handle it appropriately.
  • In this case we’re only sending the type and since this is a simple Ping-Pong example, I’m going to simply respond to the client by writing a packet with the type of “Pong” to the database.function handlePacket(snapshot) { var value = snapshot.val(); // Get the packet data if(!

If you’ve ever created an web (or react-native) application that required live updates to be sent to the client from the server, you’ve probably implemented Web Sockets at some point, and if your…
Continue reading “Replacing WebSockets with the Auto-Scaling Firebase Database.”

Easily Build Forms in React Native – React Native Development – Medium

How to Easily Build Forms in React Native:

  • It makes creating forms in React Native easy by simply having to define a model for that form and you’re set!
  • Snack will automatically pull that in for us.Tip: I find that scanning the QR code from the Expo app on my device gives the best development experience.If you prefer to do this outside of Snack make sure you install tcomb-form-native via npm or yarn.What We’re BuildingWe’ll be building a sign up…
  • First we need to get the Form component (line 6) then we need to render the form and pass our model to it as the type (line 19).
  • We create an object, add a key named “fields” (since we’re modifying the fields), add a key to this object that aligns with the key in our model (“terms”), and then inside that object we set the new label.Code is easier to understand.Then pass those options to the Form componentLet’s…
  • Just about everything in the default form is customizable.As you can see tcomb-form-native makes building forms quick and easy but also gives you the flexibility you need to create forms the give users the necessary info and fit with the rest of your app (unless I’m designing of course).

If you’re building a React Native app it’s almost a guarantee that you’ll have to build at least one form. The reality is you’ll probably build quite a few (sign in, sign up, edit profile, etc.) Yeah…
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everyone likely has something like this privately already, but this is what i use for react-native touchables

  • A wrapper around the various components built into React Native core in order to use whenever possible, provide an easier interface to using it, and flatten out API differences between the Touchable components.
  • – If is not available (on iOS and on Android API < = 20 / Android < 5.0), the component specified in this prop is used instead.
  • pass in an object of the format , this makes the easier to press by expanding the touchable area by the number of points that you specify on each side, without having to change the layout of the , eg: by adding padding.
  • – fired when you press (touch in, release within bounds).
  • – time to wait for to fire.

react-native-platform-touchable – A wrapper around the various Touchable* components built into React Native core with platform defaults
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Better Prop Validation in React – Medium

Better prop validation in #ReactJS - for more stable, easier to read code:

  • const { shape, number, object, arrayOf } = React.
  • const { number, string, shape, objectOf} = React.
  • PropTypes const coworker = shape({ id: number.isRequired, name: string, }) Meeting.propTypes = { info: shape({ timestamp: number.isRequired, room: number, organizer: coworker, }).isRequired, participants: objectOf(coworker).
  • PropTypes Meeting.propTypes = { info: shape({ timestamp: number.isRequired, room: number, organizer: shape({ id: number.isRequired, name: string, }), }).isRequired, participants: arrayOf(shape({ id: number.isRequired, name: string, })).isRequired, }
  • PropTypes Meeting.propTypes = { info: shape({ timestamp: number.isRequired, room: number, organizer: object, }).isRequired, participants: arrayOf(object).

For more stable, easier to read code
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The Complete JavaScript to ES6 Programming Tutorial 2016 Udemy Coupon 90%

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  • The course is all about exploring the cool and new features of ES6 – ECMAScript 6.
  • At the end of the course you will be well versed with all the concepts/features of ES6
  • The course covers all the new features/topics in a practical manner with each topic being demonstrated by code samples which you can see in action by easily running them via popular browsers like chrome.
  • The course is specially designed for front-end developers and designers who have interest in javascript and who want to be ahead of their peers by learning the new features of this amazing language.
  • Note:This is the latest course updated in March 2016.If you’re already fairly familiar with JavaScript or another object oriented language,this is a perfect course!!!

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