|
|
| (153 intermediate revisions by 40 users not shown) |
| Line 1: |
Line 1: |
| __TOC__
| | #REDIRECT [[:Category:Coding Tips]] |
| | |
| = Shortcut to document.getElementById =
| |
| | |
| function $(id) {
| |
| document.getElementById(id);
| |
| }
| |
| | |
| Example usage:
| |
| | |
| $("header").innerHTML = "Halloa!";
| |
| | |
| = XPath helper =
| |
| | |
| Run a particular [[XPath]] expression <code>p</code> against the context node <code>context</code> (or the document, if not provided).
| |
| | |
| Returns the results as an array.
| |
| | |
| 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;
| |
| }
| |
| | |
| = Serialize/deserialize for GM_getValue =
| |
| | |
| 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 || '({})')));
| |
| }
| |
|
| |
| 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
| |
| | |
| = DOM node juggling =
| |
| | |
| == Remove DOM node ==
| |
| | |
| function remove(element) {
| |
| if (element)
| |
| element.parentNode.removeChild(element);
| |
| }
| |
| | |
| == Insert node after node ==
| |
| | |
| function insertAfter(newNode, node) {
| |
| var parent = node.parentNode;
| |
| return node.nextSibling ? parent.insertBefore(newNode, node.nextSibling) : parent.appendChild(newNode);
| |
| }
| |
| | |
| Example usage:
| |
| | |
| var link = document.getElementById("the_link");
| |
| var icon = document.createElement("img");
| |
| icon.src = "…";
| |
| insertAfter(icon, link);
| |
| | |
| = GET an URL with callback function =
| |
| | |
| Retrieves <code>url</code> using HTTP GET, then calls the function <code>cb</code> with the response text as its single argument.
| |
| | |
| function get(url, cb) {
| |
| GM_xmlhttpRequest({
| |
| method: "GET",
| |
| url: url,
| |
| onload: function(xhr) { cb(xhr.responseText); }
| |
| });
| |
| }
| |
| | |
| Example usage:
| |
| | |
| function inform(text) {
| |
| alert("The HTML of the page: " + text);
| |
| }
| |
|
| |
| get("http://www.google.com", inform);
| |
