That code has errors. Use Firefox’s error console (CtrlShiftJ) to see them. Using jslint to check your code, can be helpful too. Anyway, this is a common Greasemonkey problem. Use the waitForKeyElements() utility to handle the delayed appearance of that button. Use jQuery to simplify the code (and make it more robust and portable). So … Read more
Ok, here’s a complete script that adds a live button to SO question pages1: // ==UserScript== // @name _Adding a live button // @description Adds live example button, with styling. // @match *://stackoverflow.com/questions/* // @match *://YOUR_SERVER.COM/YOUR_PATH/* // @grant GM_addStyle // ==/UserScript== /*— Create a button in a container div. It will be styled and positioned … Read more
Use of those keys is discouraged mainly by Greasemonkey’s lead developer. Most others, including the Tampermonkey team feel no need for such a warning. Also note that those directives are not always required for auto-updates to work. Some reasons why he would say that it was unusual and that “most” scripts should omit it: In … Read more
Update: For modern versions of Tampermonkey, Violentmonkey, Greasemonkey (but strongly recommended to avoid GM 4+): You can intercept alert() in most cases by using @run-at document-start. For example, load this script and then visit the test page: // ==UserScript== // @name _Overwrite Alert // @match *://output.jsbin.com/* // @grant none // @run-at document-start // ==/UserScript== var alrtScope; … Read more
The script should do these things: Detect if the current URL is already to the compact site. Load the compact version of the page if necessary. Beware of “anchor” URLS (they end with “fragments” or “hashes” (#…) ) and account for them. Keep the unwanted pages out of the browser history so that the back … Read more
Here is a framework for getting and storing login credentials.† The script prompts for the information on the very first run and stores it, encrypted, using GM_setValue(). It also adds two items to the Greasemonkey context menu to allow changing the username or password. // ==UserScript== // @name _Autologin, sensitive info framework // @include http://YOUR_SERVER.COM/YOUR_PATH/* … Read more
Listen to the custom events used by the youtube script: window.addEventListener(“yt-navigate-start”, e => { console.log(e.type); }); window.addEventListener(“yt-navigate-finish”, e => { console.log(e.type); }); To see all these events in Chrome: use DevTools → Elements panel → Event Listeners use DevTools → Sources panel → Global Listeners
I put this at the top of my scripts to avoid running on frames or iframes: if (window.top != window.self) //don’t run on frames or iframes return;
Refer to the W3C spec for keyboard events. Several boolean attributes are provided to determine if modifier keys were pressed in conjunction with whatever target key you are interested in. They are: ctrlKey — The “Control” key was also pressed. shiftKey — The “Shift” key was also pressed. altKey … Read more
It is possible when using Tampermonkey or Violentmonkey (Firefox or Chrome). Those userscript managers have added a GM_download method. You can use it like this: // ==UserScript== // @name New Userscript // @namespace http://tampermonkey.net/ // @version 0.1 // @description try to take over the world! // @author You // @match http*://*/* // @grant GM_download // … Read more