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What is npm?
Use npm install blerg to install the latest version of 'blerg'. Check out npm install for more info. It can do a lot of stuff. Use the npm search command to show everything that's available. Use npm ls to show everything you've installed. If a package references to another package with a git URL, npm depends on a preinstalled git. Npm gets its config settings from the command line, environment variables, and npmrc files. The npm config command can be used to update and edit the contents of the user and global npmrc files. For a list of available configuration options, see config. We need to install Nodejs, Watchman, Xcode, etc to develop the app by react-native. Let’s see how to install them one by one. Homebrew is a package manager on Mac to install and manage packages. We can install packages simply on Mac via Homebrew. Homebrew: https://brew.sh/. For Linux and Mac users, use the following command: npm install-g npm. Have npm installed in a location owned by root. Resolve and fetch all of the necessary packages for you to run the app.
Npm list -g npm list -g -depth=0 Command line help for NPM is available. A few examples of this are shown below. Npm help npm help list Additional information can be found out for a module, such as the debug module, via the info command. Npm info @sap/hana-client.
npm makes it easy for JavaScript developers to share and reuse code, and makes it easy to update the code that you’re sharing, so you can build amazing things.
Install npm
npm is installed with Node.js
npm is distributed with Node.js- which means that when you download Node.js, you automatically get npm installed on your computer.
![Mac npm app location settings Mac npm app location settings](/uploads/1/3/4/0/134068863/492726875.png)
Check that you have node and npm installed
To check if you have Node.js installed, run this command in your terminal:
To confirm that you have npm installed you can run this command in your terminal:
A note on versions
npm versions
npm is a separate project from Node.js, and tends to update more frequently. As a result, even if you’ve just downloaded Node.js (and therefore npm), you’ll probably need to update your npm. Luckily, npm knows how to update itself! To update your npm, type this into your terminal:
Node versions and Long Term Support
Node.js has lots of versions! To use Node.js, and therefore npm, effectively, you’ll want to make sure that you are on a version that is supported by the Node.js team. In general, you should use the version of Node.js labelled “LTS”.
Use a Node.js version manager
Software is always changing, and so it’s often a good practice to use a version manager to help account for this change. For this reason (and many others!) we recommend that you use a version manager for your Node.js installation. There are many great options; here are a few*:
* If you don't see your favorite version manager here, send us a note on the www repo!
Read the docs!
![Npm install Npm install](/uploads/1/3/4/0/134068863/618762326.png)
For more information, on all sorts of awesome npm things, you should read our documentation.
You'll learn how to:
- ...and muchmore!
If you ever want to help out with documentation, you can leave feedback or suggestions in the npm.community 'docs' topic!
Take me to the docs!We’re here to help
Feeling lost or overwhelmed? We’re here to answer your questions, concerns, and comments.
Ways to Reach Us
- Ask a question or provide feedback
- on Twitter, @npm_support
- via email, [email protected]
- Stay up to date on the npm registry status
- via our status page
- on Twitter, @npmstatus
- File an issue about the website on our website GitHub repo
- File an issue about the registry on our registry GitHub repo
While this tutorial has content that we believe is of great benefit to our community, we have not yet tested or edited it to ensure you have an error-free learning experience. It's on our list, and we're working on it! You can help us out by using the 'report an issue' button at the bottom of the tutorial.
React Native takes advantage of the Geolocation API that’s native on the web. This API returns different methods such as
getCurrentPosition
, and watchPosition
which are available in React Native polyfilled. To demonstrate how to use it in a React Native app we will integrate it using react-native-cli
.Getting Started
Using
react-native-cli
means there are no templates and only little boilerplate code to get started. We will generate a project using the following command. If you do not have it installed on your local machine yet, please use the first command mentioned below:So once the project directory is generated, traverse into it and run
npm start
to see if everything is installed correctly. If you are on Mac, you can use the ios
simulator to verify. For Windows and Linux users, the Android emulator will be your friend.Accessing the Geolocation API
The Geolocation API exists as a global
navigator
object in React Native, just like on the web. It’s accessible via navigator.geolocation
in our source code and there is no need to import it.For demonstration purposes, we’ll be using the
getCurrentPosition
method from the Geolocation API. This method allows a mobile app to request a user’s location and accepts three parameters: a success callback, an error callback and a configuration object.The success callback above has a
position
argument that’s an object with the following properties if executed without any errors:We will modify
App.js
in our React Native project to get started. We start by defining a basic class component that displays the text Find My Coords?
:Implementing Geolocation API
Now, let us implement the Geolocation API function
getCurrentPosition
in our app. Open App.js
and write the following code.App.js
We start be importing TouchableOpacity. It’s a wrapper that responds accurately to user touches. In a React Native mobile app, you’ll be making use of that wrapper component quite often. Think of it as a button in a web application. This newly imported wrapper accepts an onPress prop that is going to trigger the method specified,
findCoordinates
in our case.findCoordinates
holds the logic for fetching a user’s location. We’re also using the local state to display coordinates from the data provided to us by position object. The text Find My Coords?
now becomes clickable.Let’s style things up a bit using React Native’s
StyleSheet
:At this point, the example will not work as expected. We need to ask for permission to access a user’s location. Let’s fix that next.
Asking for Permission
In
iOS
, geolocation is enabled by default when a project is created using react-native-cli
. To use it, you just need to include a key called <key>NSLocationWhenInUseUsageDescription</key>
in the info.plist
file, which is inside the ios/findCoordsApp
directory.Mac Npm App Locations
For
Android
, we need to add the following line in the android/app/src/AndroidManifest.xml
:Wrapping Up
Mac Npm App Location Finder
Now if you run your application you will see the following screen:
Create Next App Npm
Click on the text and you will be asked whether to allow the application to request for the user’s location:
Mac Npm Command Not Found
If you press allow, you will see the following resulting screen:
React App Npm
That was a very simple example, but you can go from there to create something more interesting/useful. If you want to learn more about working with the Geolocation API in a React Native application, please go through the official documentation.