Re: Tagged Gold Hack Script
Hien Mondesir
Html webpack plugin is adding above files in my html template. In this case, first my browser won't be able to make request to download vendor and app and has to wait for stylesheet to get downloaded first. That's bad. Second, my script will unnecessary stop my DOM to render first paint when it's already SSR rendered html.
For second, I'm adding defer which resolves it. But for first, why my defer script has to wait for stylesheet to get downloaded even those scripts when it's not required in DOM building (but just functionality)!
So, I want to put those deferred scripts inside head tag which is possible with that html webpack plugin but I want to put them before style tag(for external stylesheet) to make benefit that browser can request these scripts parallelly instead of waiting.
Firstly, do you think it's a good idea? (May be because browser can have only limited parallel connections so, it might hinder downloading images, etc. Or may be modern browsers do it automatically as they try to look ahead in html and request defer scripts but it's only recent browsers, isn't it? )
This answer is technically similar or equal to what jcoffland answered.I just added a query to detect if a script is already present or not.I need this because I work in an intranet website with a couple of modules, of which some are sharing scripts or bring their own, but these scripts do not need to be loaded everytime again. I am using this snippet since more than a year in production environment, it works like a charme. Commenting to myself: Yes I know, it would be more correct to ask if a function exists... :-)
(Note: contrary to most examples on the net, I'm not setting type="text/javascript" on neither the enclosing tag, nor the generated one: there is no browser not having that as the default, and so it is redundant, but will not hurt either, if you disagree).
I think is for prevent the browser's HTML parser from interpreting the , and mainly the as the closing tag of the actual script, however I don't think that using document.write is a excellent idea for evaluating script blocks, why don't use the DOM...
To avoid this, you can place your javascript between comments (this style of coding was common practice, back when Javascript was poorly supported among browsers). This would work (see example in JSFiddle):
Keep your scripts right before . Async can be used with scripts located there in a few circumstances (see discussion below). Defer won't make much of a difference for scripts located there because the DOM parsing work has pretty much already been done anyway.
Your HTML will display quicker in older browsers if you keep the scripts at the end of the body right before . So, to preserve the load speed in older browsers, you don't want to put them anywhere else.
If your second script depends upon the first script (e.g. your second script uses the jQuery loaded in the first script), then you can't make them async without additional code to control execution order, but you can make them defer because defer scripts will still be executed in order, just not until after the document has been parsed. If you have that code and you don't need the scripts to run right away, you can make them async or defer.
You could put the scripts in the tag and set them to defer and the loading of the scripts will be deferred until the DOM has been parsed and that will get fast page display in new browsers that support defer, but it won't help you at all in older browsers and it isn't really any faster than just putting the scripts right before which works in all browsers. So, you can see why it's just best to put them right before .
Async is more useful when you really don't care when the script loads and nothing else that is user dependent depends upon that script loading. The most often cited example for using async is an analytics script like Google Analytics that you don't want anything to wait for and it's not urgent to run soon and it stands alone so nothing else depends upon it.
Usually the jQuery library is not a good candidate for async because other scripts depend upon it and you want to install event handlers so your page can start responding to user events and you may need to run some jQuery-based initialization code to establish the initial state of the page. It can be used async, but other scripts will have to be coded to not execute until jQuery is loaded.
Both async and defer scripts begin to download immediately without pausing the parser and both support an optional onload handler to address the common need to perform initialization which depends on the script.
Good practice is to keep all the files in your source folder to load source files fast. You need to download all the script, style, icon, and image-related files and put these files into your project folder.
defer attribute: First the defer attribute will download the script file and then wait for HTML parsing. After the end of the HTML parsing, the script will execute. In other words, it will guarantee all the scripts will execute after the HTML parsing.
async attribute: The async attribute will download the script file and execute without waiting for the end of HTML parsing. In other words, it does not guarantee that all the scripts will execute after the HTML parsing.
The async attribute is useful when the script is not used for DOM manipulation. Sometimes you need a script only for server-side operations or for handling cache or cookies, but not for DOM manipulations.
Correction: I originally stated these were picked up by the preload scanner, they're not, they're picked up by the regular parser. However, preload scanner could pick these up, it just doesn't yet, whereas scripts included by executable code can never be preloaded. Thanks to Yoav Weiss who corrected me in the comments.
All information above means that, anything you provide in your html (javascript, css ) browser will pause DOM construction process. If you are familiar with event loop, there is simple rule how event loop executes tasks:
Default - By default, as soon as the browser sees a script tag it downloads the file and then executes the script file. The script files are executed in the order of their occurrence.
Note:In defer, the js files are executed in the order of their occurrence in the HTML file while in the case of the async attribute the script files are executed in the order of download time.
Rendering the script tag to the page with react isn't the right solution - I coudln't get it to work with JSX, I assume the same applies here. Not sure why, but just add it the plain old javascript way:
To avoid the XY problem, let me say that what I actually want is to embed Javascript code into tags in the HTML files produced via Org mode export, in such a way that (1) the Javascript code is included in the Org file (not a separate Javascript file), and (2) it is very easy to edit the Javascript in a Javascript specific major mode. The question title is only one way to achieve that.
That works fine, of course, but I'd like to edit the Javascript code in a Javascript major mode. Using C-' on an HTML block sensibly opens a buffer in HTML mode. So I've been using temp buffers I manually open and put in Javascript mode.
To embed code in an Org file that's conveniently editable in the correct major mode, you can use source blocks. Is there a way to get that Javascript code to export into a tag? Or some other convenient way to get what I want?
Having a lot of script files in your head tag slows site performance because the HTTP spec advises browsers not to download more than 2 files from any host in parallel. So if you have a half dozen or so .js files being loaded from your site's script folder, the loading of the other resources on your site (images/css etc) are going to be blocked while the browser goes through the list 2x2. It produces a bottleneck, basically.
By setting the type to "text/template", it's not a script that the browser can understand, and so the browser will simply ignore it. This allows you to put anything in there, which can then be extracted later and used by a templating library to generate HTML snippets.
Backbone doesn't force you to use any particular templating library - there are quite a few out there: Mustache, Haml, Eco,Google Closure template, and so on (the one used in the example you linked to is underscore.js). These will use their own syntax for you to write within those script tags.
By setting script tag type other than text/javascript, browser will not execute the internal code of script tag. This is called micro template. This concept is widely used in Single page application(aka SPA).
Here in the image you see the code is greyed out. Before I put in the tag everything was not greyed out. Once I put in the tag is greys out the rest of the code. I might be missing a file needed to run the script tags?
I've written a small I18n plugin that accepts different languages via json. To make usage as simple as possible for the user, I want them to be able to just plop their json package directly in a page's along with the actual script:
Once you include your javascript file, you are able to access it's content (variable,methods,...) within your main file.document.getElementById has nothing to do with the contents on it, it is only looking for the DOM element itself, not the file.
I am trying to create script tags dynamically under my page using javascript. So far I am able to create it, able to set its type and src. Now my question is, is there any way that instead of defining the src to a different page can I assign its content on the same page? Let me write my code to make it make more sense:
Scripts can be read from or written to using 'scripts.text'. It's part of the script Data Object Model (DOM). And for some reason or another, it is different than other HTML tags. Example: 'myScript.innerHTML' tends not to work, but 'scripts.namedItem("myScript").text' does.
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