How Are Relative Paths Resolved in External JavaScript Files?

Relative Paths in External Javascript Files

When using external Javascript files in a web application, it's important to understand how file paths are resolved.

Paths Are Relative to Displayed Page for External JS Files

In contrast to embedded Javascript, paths specified in external JS files are relative to the current page being displayed, not to the physical location of the JS file. This can be confusing if you're accustomed to working with ASP.NET's tilde (~) operator.

Example

Consider the following external JS file:

$("#toggle").click(function() {
  if (left.width() > 0) {
    AnimateNav(left, right, 0);
    $(this).css("background", "url('../Images/filters_expand.jpg')");
  }
  else {
    AnimateNav(left, right, 170);
    $(this).css("background", "url('../Images/filters_collapse.jpg')");
  }
});

From the Index.aspx page, this JS file would find the specified images relative to the Index.aspx page's location. So, as long as the Images directory is located one level up from the Index.aspx page, the paths will work as expected.

Checking Path Resolution

If you're unsure how a path will be resolved, you can print a simple JS declaration to determine the base path. For example:

console.log("Current page path:", document.location.pathname);

This will output the path of the current page, which you can then use as the base for your relative paths.

The above is the detailed content of How Are Relative Paths Resolved in External JavaScript Files?. For more information, please follow other related articles on the PHP Chinese website!