Verify the presence of a CSS class within the stylesheet file using code-behind logic

In managing the styles for a series of pages, I have developed a common utility method. My goal is to determine if a CSS class exists in the .css file and then apply it, otherwise default to a standard style.

For example, both PageA.aspx and PageB.aspx use a styles.css file that contains a .default{...} class. To change the styling on PageA.aspx, I simply add another entry in styles.css like .PageA{....}. During runtime, the system will search for a css class named PageB - if not found, it will default to using the default class.

My question is: how can I programmatically check the .css file to see if a specific css class exists from the code-behind?

Thank you.

Answer №1

An easy approach is to first implement the default style and then layer on the pageA style. If the pageA declaration is missing, the browser will simply disregard it.
Nevertheless, for a more organized solution, it might be advisable to manage this through ASP or utilize distinct files as recommended by Seb.

Answer №2

It is common to see many questions on SO asking for a specific solution without revealing the root problem, making it challenging to provide an accurate answer.

One possible approach to simplify your task could be to divide styles into three separate files, each serving a distinct purpose:

  • styles.css: contains common styles shared between PageA and PageB
  • styleA.css: includes rules specific to PageA
  • styleB.css: includes rules specific to PageB, using the same class names as styleA.css for consistency

You can then include either styleA.css or styleB.css depending on the page you are working on, streamlining the process.

If this suggestion does not address your query, consider discussing the underlying issue instead of focusing solely on the desired solution which may not be the most efficient.

Additionally, it may not be possible to determine all defined CSS classes; they can only be set and unset as needed.

Answer №3

One way to incorporate the CSS file into your website is by parsing it with a FileReader. However, constantly searching through it line by line using the String.IndexOf() method may not be the most efficient solution for each page request.

Answer №4

I'm having trouble understanding your query. CSS is not considered a programming language, so if you are looking to access content from another file, you will need to explore alternative methods.

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