Javascript Download Files
Lianne Mccance
I generally advocate effective caching strategies so you only have to download JavaScript files when they change, as in Supercharging JavaScript in PHP (but the principles apply to any language, not just PHP) and still putting scripts at the top. It's far more convenient.
The script elements block progressive page downloads.
Browsers download several components at a time, but when they encounter an external script, they stop further downloads until the script file is downloaded, parsed, and executed.
This hurts the overall page time, especially if it happens several times during a page load.
To minimize the blocking effect, you can place the script element toward the end ofthe page, right before the closing tag.
This way there will be no other resources for the script to block.The rest of the page components will be downloaded and already engaging the user.
The worst antipattern is to use separate files in the head of the document:
2) load the vast majority of your JS at the bottom of the page.
There is practically nothing that can't be lazy-loaded, or at least can't be initialized at the bottom of the page, after the DOM is ready, and if there really is, serve those as separate files at the top of the page, and consider how you might rewrite to depend on them less.
5) serving JS files is a trade-off:Compiling JS takes a while. So if you're loading 40,000 lines in one file, your browser is going to pause for a little while, as it compiles all of that.
If you serve 18 separate files, then you have to make 18 different server calls.
That's not cool, either.
So a good balance is to concatenate files together that you KNOW you're going to need for that page, and then lazy-load anything which is optional on the page (like a widget for adding a comment, or the lightbox widget, etc).
And either lazy-load them after all of the main products are up and running, OR load them at the last possible second (like when a user hits the "add comment" button).
I recently had the same problem, and then I developed and released a JS library (MIT licence) to do this. Basically, you can put all your stuff (js, images, css ...) into a standard tar archive (which you can create server side), and the library reads it and allows you to easily use the files.
The number of files to load has an impact on the load speed of the whole site. I would recommend to pack into a single javascript file all the required functionality for the website to display properly.
A JS file is a plain text file that contains JavaScript code. It is used to execute JavaScript instructions in a webpage. JS files may include functions that open and close windows, validate form fields, enable rollover images, or create dropdown menus.
JS files often contain standard or site-wide functions that a developer wants to include on each of a site's webpages. Storing the functions in a single, importable JS file makes them easier to maintain and troubleshoot.
You can open and edit a JS file in any text or source code editor. Source code editors, such as Microsoft Visual Studio Code and GitHub Atom contain helpful syntax-highlighting and code-editing tools that make reading and editing JS files easier.
I want to clear only JavaScript files from my web browsers (Firefox and Chrome). I am doing JavaScript debugging, and it's annoying that my JS just won't get updated whenever I change my JS files. The only thing I can do now is to clear my cookies, but doing that erases all of my browsing history.
I disagree with @7wp. Since some of your end users aren't familiar with the Ctrl+F5 function, and some aren't even aware of the differences between browsers and even the existance of other browsers (elders for example) you should force the browser to download a new copy of the JS/CSS files.
Alternatively, you can try opening up a new Private session in Firefox or Incognito window in Chrome; neither should cache any files (including your .JS files) you automatically download and process when browsing.
JS (JavaScript) are files that contain JavaScript code for execution on web pages. JavaScript files are stored with the .js extension. Inside the HTML document, you can either embed the JavaScript code using the tags or include a JS file. Similar to CSS files, JS files can be included in multiple HTML documents for code reusability. JavaScript can be used to manipulate the HTML DOM.
I have an awful lot of .js files and I'm not sure if I need them or if I can delete them. I am using MAC OS X 10.13.6 with a Google Browser and I am synced via google to my Ipad IOS 11.4 . Any help on this would be appreciated. I purchased this mac in late 2009. I can't update any further than High Sierra just fyi
I went to my IMAC under Devices in the left column of Finder, the I searched for .js files and a bunch came up from 2/23/19 and I hit Get Information and this is an example of how they all look they open in Google Chrome but are all related to pictures.
One thing you can try is to move these files to another location temporarily. Access FB and see if you have any issues doing so. You can then always move them back to their original location. The other option is to open any of these in a script editor to see what they do ... but this would require that you are familiar with javascript.
Selecting and interacting with files on the user's local device isone of the most commonly used features of the web. It allows users to selectfiles and upload them to a server, for example, uploading photos, orsubmitting tax documents, etc. But, it also allows sites to read andmanipulate them without ever having to transfer the data across the network.
The File System Access API provides an easy way to both read fromand write to files and directories on the user's local system. It's currentlyavailable in most Chromium-based browsers such as Chrome or Edge. To learnmore about it, see the File System Access API article.
The easiest way for users to select files is using the element, which is supported in everymajor browser. When clicked, it lets a user select a file, or multiple filesif the multiple attribute is included, usingtheir operating system's built-in file selection UI. When the user finishesselecting a file or files, the element's change event fires. You canaccess the list of files from event.target.files, which is aFileList object. Each item in the FileList is aFile object.
In some cases, you may want to limit the types of files users can select.For example, an image editing app should only accept images, not text files.To do that, add an accept attribute tothe input element to specify which file types are accepted.
In some browsers, the element is also a drop target,allowing users to drag-and-drop files into your app. But, the drop target issmall, and can be hard to use. Instead, once you've provided the corefunctionality using an element, you can provide alarge, custom drag-and-drop surface.
Squoosh allows the user to drag and drop an image anywhere into the window,and clicking select an image invokes the element.Whatever you choose as your drop zone, make sure it's clear to the user thatthey can drag and drop files onto that surface.
To enable an element to be a drag-and-drop zone, you'll need to listen fortwo events, dragover and drop. The dragoverevent updates the browser UI to visually indicate that the drag-and-dropaction is creating a copy of the file. The drop event is fired after theuser drops the files onto the surface. Similar to the input element,you can access the list of files from event.dataTransfer.files, which isa FileList object. Each item in the FileList is aFile object.
event.stopPropagation() andevent.preventDefault() stop the browser's defaultbehavior and allow your code to run instead. Without them,the browser would otherwise navigate away from your page and open the filesthe user dropped into the browser window.
If drag-and-drop is enabled, a user may try to drag a directory into thedrop zone. When the drop event is fired, it will include a File object forthe directory, but does not provide access any of the files within thedirectory.
When reading large files, it may be helpful to provide some UX to indicatehow far the read has progressed. For that, use theprogress event provided by FileReader. Theprogress event provides two properties, loaded (the amount read) andtotal (the amount to read).
... you could use a command line statement like the following in the c:\my-project folder to generate a story.html (within the same folder) that contains all the Passages from the TW file as well as the JavaScript & CSS from the JS & CSS files.
Just change "C:/Games/MyGameDirectory/" to the directory where your HTML and JavaScript files are located, and change "YourExternalCode.js" to the name of the JavaScript file you want to access. Then that code can detect whether you're playing through Twine or not, and set the file path appropriately before starting to load the JavaScript file.
Also note that in your external files you'll need to put "SugarCube." in front of SugarCube functions and properties. So if you had code that used "State.variables" to get SugarCube variables, then in the external JavaScript version you'd have to do "SugarCube.State.variables" instead.
In the old template structure, extra javascript files could be attached by the end-user (which was mostly us) when we were setting up the landing pages, but in the new theming structure, only css files can be attached/overridden.
I believe in such case one could suspend using the G_RESOURCE_OVERLAYS feature through /.profile (as discussed in the recovery section), subsequently repeat extracting the subject files from the fresh libgnome-shell.so, and re-apply the modifications in a compatible manner.
I reckon the risks around the updates can be avoided if one, instead of relying on the resource overlays feature permanently, compiles the modified files back into libgnome-shell.so (because then an update does not cause an event of incompatibility; instead it just rewrites libgnome-shell.so in one go).
df19127ead