Code snippets: Difference between revisions

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= XPath helper =
#REDIRECT [[:Category:Coding Tips]]
 
function $x(p, context) {
  if (!context) context = document;
  var i, arr = [], xpr = document.evaluate(p, context, null, XPathResult.UNORDERED_NODE_SNAPSHOT_TYPE, null);
  for (i = 0; item = xpr.snapshotItem(i); i++) arr.push(item);
  return arr;
}
 
Run a particular xpath expression <code>p</code> against the context node <code>context</code> (or the document, if not provided).
Return the results as an array.
 
= Serialize/deserialize =
 
Used to store and retrieve multiple values (typically as a serialized hash) in a single [[GM_getValue]] slot.
 
function deserialize(name, def) {
  return eval(GM_getValue(name, (def ? def : '({})')) );
}
function serialize(name, val) {
  GM_setValue(name, uneval(val));
}
 
Example usage:
 
var settings = {a: 1, b: 2, c: 3};
serialize('test', settings);
var _settings = deserialize('test');
// now "settings == _settings" should be true

Latest revision as of 19:09, 4 February 2010