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laughinghan/minimap.js

Created July 21, 2011 03:03
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Minimap of a web page
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minimap.js
javascript:
var minimap = document.body.cloneNode(true);
[].forEach.call(minimap.getElementsByTagName('a'), function(link) {
link.href = 'javascript:;';
});
minimap.style.position = 'fixed';
minimap.style.webkitTransform = 'scale(.1)';
document.body.appendChild(minimap);
minimap.style.top = minimap.offsetHeight*-.45+'px';
minimap.style.right = minimap.offsetWidth*-.45+'px';
minimap.onmousedown = function(e) {
document.body.scrollTop = 10*e.clientY-innerHeight/2;
document.onmousemove = arguments.callee;
document.onmouseup = function(){ document.onmousemove = null; };
return false;
};
@lyyourc
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lyyourc commented Apr 11, 2016

Can you explain this line: document.body.scrollTop = 10*e.clientY-innerHeight/2;

Why 10 * e.clientY - innerHeight / 2? A precise value or estimate?

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