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Editing your code through the GitHub web interface is a good way to start, especially if you only need to make a few edits or upload a couple of files to your repo. But the web interface will feel very slow if you edit or upload multiple files in your repo. To speed up your work, we recommend that you tải về two không lấy phí toolsGitHub Desktop and Atom Text Editorwhich run on Mac or Windows computers. When you connect your GitHub web account to GitHub Desktop, it allows you to pull the most recent version of the code to your local computers hard drive, make and test your edits, and push your commits back to your GitHub web account. Atom Text Editor, which is also created by the makers of GitHub, allows you to view and edit code repos on your local computer more easily than the GitHub web interface. While there are many text editors for coders, Atom is designed to work well with GitHub Desktop.

Tip: Currently, neither GitHub Desktop nor Atom Editor are supported for Chromebooks, but Chromes Web Store offers several text editors, such as Text and Caret, which offer some of the functionality described below.

Lets use GitHub Desktop to pull a copy of your leaflet-map-simple template to your local computer, make some edits in Atom Editor, and push your commits back up to GitHub.

Go to the GitHub web repo you wish to copy to your local computer. In your browser, navigate to github/USERNAME/leaflet-map-simple, using your GitHub username, to access the repo you created in the Copy, Edit, and Host a Simple Leaflet Map Template section of this chapter. Click the Code > Open with GitHub Desktop drop-down menu button near the middle of your screen, as shown in Figure 10.18. The next screen will show a link to the GitHub Desktop web page, and you should tải về and install the application.

Figure 10.18: In your GitHub repo on the web, click Code to Open with GitHub Desktop to tải về and install GitHub Desktop.

When you open GitHub Desktop for the first time, youll need to connect it to the GitHub web account you previously created in this chapter. On the welcome screen, click the blue Sign in to GitHub button, as shown in Figure 10.19, and login with your GitHub username and password. On the next screen, GitHub will ask you to click the green Authorize desktop button to confirm that you wish to connect to your account.

Figure 10.19: Click the blue Sign in to GitHub button to link GitHub Desktop to your GitHub account.

In the next setup screen, GitHub Desktop asks you to configure Git, the underlying software that runs GitHub. Confirm that it displays your username and click Continue, as shown in Figure 10.20.

Figure 10.20: Click the Continue button to authorize GitHub Desktop to send commits to your GitHub account.

On the Lets Get Started with GitHub Desktop screen, click on Your Repositories on the right side to select your leaflet-map-sample, and further below click the blue button to Clone it to your local computer, as shown in Figure 10.21.

Figure 10.21: Select your leaflet-map-simple repo and click the Clone button to copy it to your local computer.

When you clone a repo, GitHub Desktop asks you to select the Local Path, meaning the location where you wish to store a copy of your GitHub repo on your local computer, as shown in Figure 10.22. Before you click the Clone button, remember the path to this location, since youll need to find it later.

Figure 10.22: Select the Local Path where your repo will be stored on your computer, then click Clone.

On the next screen, GitHub Desktop may ask, How are you planning to use this fork? Select the default entry To contribute to the parent project, which means you plan to send your edits back to your GitHub web account, and click Continue, as shown in Figure 10.23.

Figure 10.23: If asked how you plan to use this fork, select the default To contribute to the parent project and click Continue.

Now you have copies of your GitHub repo in two placesin your GitHub web account and on your local computeras shown in Figure 10.24. Your screen may look different, depending on whether you use Windows or Mac, and the Local Path you selected to store your files.

Figure 10.24: Now you have two copies of your repo: in your GitHub trực tuyến account (on the left) and on your local computer (on the right, as shown in the Mac Finder). Windows screens will look different.

Figure 10.25: In GitHub Desktop, confirm the Current Repo and click the Open in Atom button to edit the code.

Since Atom Editor is integrated with GitHub Desktop, it opens up your entire repo as a project, where you can click files in the left window to open as new tabs to view and edit code, as shown in Figure 10.26. Open your index.html file and edit the title of your map, around line 22, then save your work.

Figure 10.26: Atom Editor opens your repo as a project, where you can click files to view code. Edit your map title.

After saving your code edit, its a good habit to clean up your Atom Editor workspace. Right-click on the current Project and select Remove Project Folder in the menu, as shown in Figure 10.27. Next time you open up Atom Editor, you can right-click to Add Project Folder, and choose any GitHub repo that you have copied to your local computer.

Figure 10.27: To clean up your Atom Editor workspace, right-click to Remove Project Folder.

Sidebar: To fully view more complex code templates in your local browser, including some Chart.js or Highcharts templates in Chapter 11 or Leaflet templates in Chapter 12, you may need to temporarily relax same-origin policy restrictions, an internet security mechanism that limits how web pages access content from other domains. You can do so by managing your Cross-Origin Resource Sharing(CORS) settings, and methods for doing this vary across operating systems and browsers. For example, to disable same-origin policy on Safari for Mac, first go to Preferences > Advanced to enable the Developer menu, then in this new menu select Disable Cross-Origin Restrictions, as shown in Figure 10.28. After you are done testing your code, restart Safari to reset the setting to its default safety position. See also ways to run the Chrome browser without same-origin restrictions on various computers, as shown in Figure 10.29, or this popular Stackoverflow page. If you temporarily disable this safety mechanism in your browser, be sure to re-enable it before browsing sites on the public web.

Figure 10.28: To view more complex code templates on your local computer with Safari browser, temporarily Disable Cross-Origin Restrictions.

Figure 10.29: To view more complex code templates on your local computer with Chrome browser, use the Terminal application command-line (bottom window) to run a version without same-origin safety restrictions.

Note: Since your browser is displaying only the local computer version of your code, the web address will begin with file:///… rather than https://…, as appears in your GitHub Pages trực tuyến map. Also, if your code depends on trực tuyến elements, those features may not function when viewing it locally. But for this simple Leaflet map template, your updated map title should appear, allowing you to check its appearance before pushing your edits to the web.

Now that youve edited the code for your map on your local computer, lets test how it looks before uploading it to GitHub. Go to the location where you saved the repo on your local computer, and right-click the index.html file, select Open With, and choose your preferred web browser, as shown in Figure 10.30.

Figure 10.30: Right-click the index.html file on your local computer and open with a browser to check your edits.

Now lets transfer your edits from your local computer to your GitHub web account, which you previously connected when you set up GitHub Desktop.

Go to GitHub Desktop, confirm that your Current Repo is leaflet-map-simple, and you will see your code edits summarized on the screen. In this two-step process, first click the blue Commit button at the bottom of the page to save your edits to your local copy of your repo. (If you edit multiple files, GitHub Desktop will ask you write a summary of your edit, to help you keep track of your work.) Second, click the blue Push origin button to transfer those edits to the parent copy of your repo on your GitHub web account. Both steps are shown in Figure 10.31.

Figure 10.31: In this two-step process, click Commit, then click Push origin to save and copy your edits from your local computer to your GitHub web account, as shown in this animated GIF.

Congratulations! Youve successfully navigated a round-trip journey of code, from your GitHub account to your local computer, and back again to GitHub. Since you previously used the GitHub Pages settings to create an trực tuyến version of your code, go see if your edited map title now appears on the public web. The web address you set up earlier follows this format USERNAME.github.io/REPOSITORY, substituting your GitHub username and repo name.

While you could have made the tiny code edit above in the GitHub web interface, hopefully youve begun to see many advantages of using GitHub Desktop and Atom Editor to edit code and push commits from your local computer. First, you can make more complex code modifications with Atom Editor, which includes search, find-and-replace, and other features to work more efficiently. Second, when you copy the repo to your local computer, you can quickly drag-and-drop multiple files and subfolders for complex visualizations, such as data, geography, and images. Third, depending on the type of code, you may be able to test how it works locally with your browser, before uploading your commits to the public web.

Tip: Atom has many built-in commands to help you edit code. One is View > Toggle Soft Wrap, which adjusts the right-hand margin to make long code strings visible on your screen. A second command is Edit > Toggle Comments, which automatically detects the coding language and converts the selected text from executable code to non-executed code comments. A third command is Edit > Lines > Auto Indent, which cleans up code indentation to make it more readable. Finally, you can install many more Atom packages in the Preferences menu.

GitHub also offers a powerful platform for collaborative projects. When two people work on a shared repository, one co-worker can pull the most recent version of the code to their local computer using GitHub Desktop, then push their edits (also called commits) back to the trực tuyến GitHub repo. The other co-worker can pull and push from the same repo at the same time, though its simpler if they work on different files or sections of code. Both can see the changes that the other person made by selecting the GitHub repo Code tab and selecting a specific commit, which can be viewed line-by-line in green (additions) or red (deletions), as shown in Figure 10.32.

Figure 10.32: View commits made by co-workers on a shared GitHub repo.

Although GitHub does not operate like Google Documents, which displays live edits, the platform has several advantages when working collaboratively with code. First, since GitHub tracks every commit, it allows you to go back and restore a very specific past version of the code if needed. Second, when GitHub repos are public, anyone can view your code and submit an issue to notify the owner about an idea or problem, or send a pull request of suggested code edits, which the owner can accept or reject. Third, GitHub allows you to create different branches of a repo in order to make edits, and then merge the branches back together if desired. Occasionally, if two collaborators attempt to push incompatible commits to the same repo, GitHub will warn about a Merge Conflict and ask you to resolve it in order to preserve everyones work.

Many coders prefer to work on GitHub using its Command Line Interface (CLI), which means memorizing and typing specific commands directly into the Terminal application on Mac or Windows, but this is beyond the scope of this introductory book.

Summary

If this is the first time youve forked, edited, and hosted live code on the public web, welcome to the coding family! We hope you agree that GitHub is a powerful platform for engaging in this work and sharing with others. While beginners will appreciate the web interface, youll find that the GitHub Desktop and Atom Editor tools makes it much easier to work with Chart.js and Highcharts code templates in Chapter 11 and the Leaflet map code templates in Chapter 12. Lets build on your brand-new coding skills to create more customized charts and maps in the next two chapters.

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