Code snippets: Difference between revisions
From GreaseSpot Wiki
Jump to navigationJump to search
No edit summary |
(Renamed xpath function to $x and cleaned it up a bit, added serialize/deserialize.) |
||
| Line 1: | Line 1: | ||
= | = XPath helper = | ||
function | function $x(p, context) { | ||
if (!context) context = document; | |||
var arr = []; | |||
var 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). | 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. | 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 | |||
Revision as of 21:32, 23 March 2007
XPath helper
function $x(p, context) {
if (!context) context = document;
var arr = [];
var 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 p against the context node context (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
