Can JavaScript alter the Page Source Code?

Something that has caught my attention recently is the behavior of my website's AJAX implementation. When my site receives a response, it is inserted into div elements using the .innerHTML method. For example:

$("#cont-btn")
  .click(function() {
      var colourID = document.getElementById("colour")
        .value;
      var styleID = document.getElementById("style")
        .value;
      var sizeID = document.getElementById("size")
        .value;
      if (done == 0) {
        if (cat == 0) {
          var catag = document.getElementById("category")
            .value;
          $.get("catHan.ashx", {
              cata: catag
            })
            .done(function(tD) {
              cat = 1;
              document.getElementById("style")
                .innerHTML = tD;
              $("#style")
                .slideToggle("slow");
            });
        } else {

During my investigation with Google Chrome's Developer Tools, I noticed that the page source appears to update accordingly. However, when I actually view the page source itself, the changes do not seem to reflect?

My development environment revolves around C# and ASP technologies. Is this normal behavior? I find it quite puzzling why the inspected element reflects the updates but the actual viewed source does not.

(I'm particularly concerned because search engine bots typically crawl through page sources for indexing purposes)

Here's an image illustrating the issue when viewing the source: https://i.sstatic.net/Km51c.png
As seen in the above image, the added elements are not visible in the source.

Answer №1

When you view the source code, you are looking at the raw HTML that was sent from the server to your browser. On the other hand, when you inspect the DOM using tools like "Elements", you are seeing a visual representation of the Document Object Model (DOM) - the dynamic in-memory data structure that represents the structure of your website.

It is possible to manipulate the DOM, but making changes directly to the source code would not have any lasting effect.

Answer №2

JavaScript has no impact on the original page's content.

Your server sends the source page to visitors.

JS only updates the DOM (Document Object Model) visible on the webpage.

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