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backup-commander / html / js / common.js
@John Pearcey John Pearcey on 9 Oct 2 KB First commit
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  1.  
  2. /**
  3.  * COPYRIGHT © 2022 JOHN PEARCEY
  4.  * All rights reserved
  5. */
  6.  
  7. /*
  8.  * pagename:
  9.  * 	The name of the server-side script to handle this post.
  10.  *	fnCallback:
  11.  * 	The javascript callback function, called after the AJAX call completes.
  12.  * map_params:
  13.  * 	A map containing name value pairs required by the script.
  14.  * 	e.g.
  15.  * 	map_params = new Map();
  16. 		map_params.set('username', document.getElementById('username').value );
  17. 		map_params.set('pwdhash', document.getElementById('pwd').value );
  18.  */
  19. function postData( pagename, fnCallback, map_params ){		
  20. 							
  21. 	//console.log( 'postData called' );
  22. 	
  23. 	let formData = new FormData();		
  24. 	map_params.forEach((value, key, map) => {
  25. 		//if(key=='action') console.log("postData: ", pagename, value );
  26. 		formData.append( key, value );
  27. 	});
  28. 		
  29. 	//https://www.digitalocean.com/community/tutorials/how-to-use-the-javascript-fetch-api-to-get-data
  30. 	//https://jsonplaceholder.typicode.com/users
  31. 	//https://javascript.info/fetch						
  32. 	fetch( pagename, {
  33. 		method: 'POST',
  34. 		body: formData,
  35. 		
  36. 	})
  37. 	/*.then((response) => {
  38. 		return response.json(); */
  39.  
  40. 	.then(response => response.text()) 
  41.     .then((dataStr) => {
  42. 		
  43. 		//console.log(dataStr);
  44. 		
  45. 		//there's a whole bunch of warnings and errors that might be sent by PHP. It is not possible
  46. 		//to catch them in the serverside PHP code. So here we search for our json encoded return string which
  47. 		//must be either Error or OK.
  48. 		let pos = dataStr.indexOf("[\"OK\"");
  49. 		let additional=null;
  50. 		if(pos==-1){
  51. 			pos = dataStr.indexOf("[\"Error\"");
  52. 			if(pos==-1){
  53. 				//the PHP is pretty fucked up if you get here!
  54. 				console.warn( dataStr );
  55. 				let encodedStr = JSON.stringify( ["Illegal return from server. Did not find Error or OK.", dataStr ] );
  56. 				return JSON.parse( encodedStr );
  57. 			}
  58. 		}			
  59. 		//console.log(dataStr);
  60.       return JSON.parse(dataStr);
  61.         		
  62. 	}).then((data) => {
  63. 		fnCallback( true, data, map_params );
  64. 	
  65. 	}).catch(function(error) {
  66. 		console.log( error );
  67. 		fnCallback( false, error, map_params );
  68. 	});
  69. 	
  70. }
  71.  
  72. function checkReturn( success, data, bGetErr=false ){
  73.  
  74. 	if(!success){
  75. 		console.warn( "callback error: " + data );
  76. 		return false;
  77. 	}
  78.  
  79. 	if(data[0]=="Error"){
  80. 		if(bGetErr) return data;
  81. 		alert( "Error: " + data[1] );
  82. 		for( i=2; i<data.length; i++){
  83. 			console.warn( data[i] );
  84. 		}		
  85. 		return false;
  86. 	}
  87.  
  88. 	if(data[0]!="OK"){
  89. 		console.warn( "Unkown server return string ", data );
  90. 		if(bGetErr) return data;
  91. 		return false;
  92. 	}
  93. 	if(bGetErr) return null;
  94. 	return true;
  95. }
  96.  
  97. function stripHtml( txt ){	
  98. 	txt =	txt.replace(/<div>/gi, '\n');	
  99. 	txt =	txt.replace(/<\/?[^>]+>/gi, ''); //strip HTML	
  100. 	return txt;
  101. }