Assistance with themed implementation for single-page web applications in JavaScript

My goal is to incorporate theme support into my single page application. The catch is that the theme change needs to be done locally through JavaScript without making any server calls, in order to work in offline mode. Since I am using angularjs, the HTML will be altered in the router.

The main issue I am facing is how to handle CSS. Is there a JavaScript library available to help me load CSS files? Are there potential complications that I should be aware of?

UPDATE: After some research, I came across the following library that may solve my problem of loading CSS files: https://github.com/rgrove/lazyload/. However, one drawback is that the library was last updated more than a year ago. I would prefer to find a more actively maintained library if possible.

javascriptcssthemesangularjs

Answer №1

Applying and removing styles in JavaScript is a simple process. All you need to do is create the element with the desired rules and add it to the page. To remove the rules, just delete the element. When it comes to link elements that reference external stylesheets, using style elements with inline rules may be more reliable, especially in offline mode when caching issues are a concern.

Below is an example utilizing a style element:

(function() {
  var css = "body { color: green; }";

  document.getElementById("theButton").onclick = toggleStyle;

  function toggleStyle() {
    var style = document.getElementById("styleOne");
    if (style) {
      // Remove it
      style.parentNode.removeChild(style);
    }
    else {
      // Add it
      style = document.createElement('style');
      style.id = "styleOne";
      if (style.styleSheet) {
          style.styleSheet.cssText = css;
      }
      else {
          style.appendChild(document.createTextNode(css));
      }
      document.body.appendChild(style);
    }
  }

})();

View Live Example | View Source Code

Utilizing a link element can be even simpler as it eliminates the need to navigate browser discrepancies regarding style text placement.

Answer №2

In the event that your theme only alters the color scheme, my suggestion would be to utilize distinct CSS classes to tackle this particular issue. Since CSS properties can be overridden, it is recommended to attach the theme name as a class to the parent element and establish the corresponding rule for it. It is advisable to segregate all theme-related CSS rules into a separate file for easier management.

For instance:

.themename.cssclassname{
   color: blue;
}

will take precedence over:

.cssclassname{
   color: purple;
}

Furthermore, utilizing less can simplify the creation of nested rules.

Adopting this approach offers three key advantages:

  1. Compatibility across all browsers, including IE7. (Note: There may be issues with dynamic style tag insertion in IE7.)

  2. All CSS files will be cached for optimized performance.

  3. Improved ease of maintenance. (It is preferable to avoid excessive blending of CSS and JavaScript code.)

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