Spyjax: Using a:visited to test your history
Written by on June 1st, 2007 in Ajax News.
Spyjax can scare you, or excite you depending on what you want to do.
By using a simple JavaScript check on the CSS style on URLs, a script can work out if you have been there:
JAVASCRIPT:
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function hasLinkBeenVisited(url) {
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var link = document.createElement(’a');
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link.href = url;
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document.body.appendChild(link);
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if (link.currentStyle) {
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var color = link.currentStyle.color;
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if (color == ‘#ff0000′)
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return true;
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return false;
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} else {
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link.setAttribute(”href”,url);
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var computed_style = document.defaultView.getComputedStyle( link, null );
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if (computed_style) {
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if (computed_style.color == ‘rgb(255, 0, 0)’)
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return true;
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}
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return false;
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}
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}
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Couple this with the ability to chunk this over time, and you could quickly test a lot of URLs.
Source: Ajaxian
Original Article: http://ajaxian.com/archives/spyjax-using-avisited-to-test-your-history