Forcing FramesIn the previous page, we showed you how to escape frames. Now we‘re going to teach you how to force frames. If your Web site is based on frames, and you don‘t want the user to be able to load an inner page in a full window, you can rebuild the frame-setting document when the user attempts to load such a page. First, take a look at the following HTML document:
This document is named canvas.html. The upper and left frames are used for navigation purposes, while the main frame displays the actual content of the site. canvas.html initially loads frame3.html as the content page, but other documents can be loaded in that frame as well. Let‘s assume the user loads a document named frame4.html in the main frame. Everything looks great. We now have a frame-setting document named canvas.html, and three child frames named frame1.html, frame2.html, and frame4.html. But what happens if the user attempts to load frame4.html in a separate window? We need to force the frames. First, we‘ll add a simple script to the
Now let‘s see the new version of canvas.html:
We start by assigning the three default frames, frame1.html, frame2.html, and frame3.html to three variables,
These three files are the the basis of the the frame set. Any subsequent change will be on top of these three initial frames. Then, we extract the
This string begins after the question mark at the URL. In the example above, we added a string to the canvas.html URL:
The string
And we take the substring starting just after the
Now that we know both the frame number and the file name, we can assign the file to the frame:
Go ahead and try loading one of the frames as a separate file. You‘ll find out that this is not possible. The whole frameset will be always forced. |
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