☰

Wait for it

Wait for something. Silently reloads the page every X seconds until some condition is met

  1. // ==UserScript==
  2. // @name           Wait for it
  3. // @namespace      http://userscripts.org/scripts/show/128187
  4. // @description    Wait for something. Silently reloads the page every X seconds until some condition is met
  5. // @version        1.02
  6. // @include        *
  7. // ==/UserScript==
  8.  
  9. GM_registerMenuCommand('Wait for something...', function(){
  10.  
  11. 	var search = prompt('Wait for what?\n'+
  12. 		'Can be some literal text in the page, a regular expression, CSS selector or XPath query\n'+
  13. 		'Leave blank to wait for any change',
  14. 		localStorage['wfi_wfw'] || '');
  15. 	if(search === null) return;
  16.  
  17. 	var html = null;
  18. 	try{ var re = new RegExp(search, 'i'); }
  19. 	catch(e){ re = null; }
  20.  
  21. 	function check(doc){
  22. 		if(!search){
  23. 			if(doc == document) return false;
  24. 			var d = doc.documentElement.innerHTML;
  25. 			if(!html) html = d;
  26. 			return html != d;
  27. 		}
  28.  
  29. 		//CSS
  30. 		try{ if(doc.querySelector(search)) return true; }
  31. 		catch(e){}
  32.  
  33. 		//XPath
  34. 		try{
  35. 			var res = doc.evaluate(search, doc, null, XPathResult.ANY_UNORDERED_NODE_TYPE, null);
  36. 			if(res.singleNodeValue) return true;
  37. 		}
  38. 		catch(e){}
  39.  
  40. 		//RegExp
  41. 		if(re && re.test(doc.documentElement.textContent)) return true;
  42.  
  43. 		//text
  44. 		return doc.documentElement.textContent.indexOf(search) > -1;
  45. 	}
  46.  
  47. 	if(check(document)){
  48. 		alert('"'+search+'" is already there, nothing to wait for...');
  49. 		return;
  50. 	}
  51.  
  52. 	var secs = prompt('Check every how many seconds?', localStorage['wfi_secs'] || 30)*1;
  53. 	if(!secs) return;
  54.  
  55. 	localStorage['wfi_wfw'] = search;
  56. 	localStorage['wfi_secs'] = secs;
  57.  
  58. 	var div = document.createElement('div');
  59. 	div.innerHTML = 'Waiting for '+(search ? '"'+search+'"' : 'anything')+' every '+secs+' seconds... Last checked at <span id="wfi_last"/>';
  60. 	div.style.position = 'fixed';
  61. 	div.style.top = '0';
  62. 	div.style.left = '0';
  63. 	div.style.backgroundColor = '#ffc';
  64. 	document.body.appendChild(div);
  65. 	var last = document.getElementById('wfi_last');
  66.  
  67. 	var xhr = new XMLHttpRequest();
  68. 	function load(){
  69. 		document.body.removeChild(div);
  70. 		if(check(document)){
  71. 			alert((search ? '"'+search+'"' : 'somehing')+' found in '+document.title);
  72. 		}
  73. 		else{
  74. 			document.body.appendChild(div);
  75. 			
  76. 			xhr.open('GET', document.location.href, true);
  77. 			xhr.send();
  78. 			last.innerHTML = new Date();
  79. 		}
  80. 	}
  81.  
  82. 	var doc = document.implementation.createHTMLDocument('');
  83. 	xhr.onreadystatechange = function(){
  84. 		if (xhr.readyState == 4 && xhr.status == 200){
  85. 			doc.documentElement.innerHTML = xhr.responseText;
  86. 			if(check(doc)){
  87. 				alert((search ? '"'+search+'"' : 'somehing')+' found in '+document.title);
  88. 				document.location.reload();
  89. 			}
  90. 			else setTimeout(load, secs*1000);
  91. 		}
  92. 	};
  93.  
  94. 	load();
  95. });