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Discussion on: DOM elements with ID's are global variables

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realkaylent profile image
Kaylen Travis Pillay

Okay, so I'm a bit confused when you say, "yes, some websites still send HTML over the wire". I thought ALL web servers send back HTML when an http request is received for a particular website. I'm still learning guys, so if I'm wrong please help me. Thank you

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buntine profile image
Andrew Buntine Author • Edited

No, don't sweat it - that is a good question.

It was meant as a subtle jab at the explosion in popularity of frontend frameworks, in which one sends Javascript over the wire and then creates the HTML elements at runtime in the web browser. For example, a React app typically sends Javascript over HTTP and then the web browser executes it to produce the HTML.

So my comment was kind of saying: "Some people still do it the 'old' way"

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karfau profile image
Christian Bewernitz • Edited

Since it's still a browser doing the rendering, it needs at least a script tag to run the JavaScript(not sure if only having a script tag in an HTML file would be valid HTML5). And usually some more but minimal HTML is still delivered to the browser.
Sometimes devs are not aware of it, because this file rarely changes in the code base, or it is "hidden" because the build tool applies some default template.

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buntine profile image
Andrew Buntine Author

Yep, absolutely. To clarify, the comment is referring to the HTML elements which make up the visible UI of a particular app. Images, titles, tables, lists, etc, etc. :)

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realkaylent profile image
Kaylen Travis Pillay

Lol thank you for that. That actually sounds cool! I have to play around with that.

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danp

The HTML in modern web apps is just a static resource like images. So when you load a web app, you fetch the HTML (that defines the layouts basically) together with all assets linked and the browser starts executing the JS code. But the data themselves are fetched into the app in the form of JSON and then inserted into the document via templating.

For example, an email web app, when you log into it, fetches you the all HTML of all the UI, but the emails themselves come in via AJAX and JSON and injected into the DOM by JS code.