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Web based single-page, light weight HTML editor with auto-save, using HTML, JavaScript and PHP

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Source Code:

001 <?php
002     /**
003      *  A lightweight, single page HTML editor with live preview and auto-save
004      *  Author: Praveen Nair @ http://blog.ninethsense.com/
005      *  
006      */
007
008     $f = $fn = "";
009     if (count($_GET) == 1)  {
010         $f = key($_GET);
011         $fn = "$f.html";
012     } else {
013         die();
014     }
015
016      if ( isset($_POST["c"]) )  {
017         $content = $_POST["c"];
018         echo  (file_put_contents($fn, $content))?"1":"-1";
019         die();
020     }
021    
022 ?>
023 <html>
024     <head>
025         <meta http-equiv="content-type" content="text/html; charset=utf-8">
026         <style>
027             #tb {
028                 margin-left: 5;
029             }
030             #editor, #preview {
031                 flex: 1 0 0;
032                 background:#eee;
033                 margin: 5 5;
034                 padding: 5 5;
035                 overflow:auto;
036             }
037             #editor {
038                 font-family: monospace;
039             }
040             #preview, a {
041                 font-family: Arial, Helvetica, sans-serif;
042             }
043             [placeholder]:empty::before {
044                 content: attr(placeholder);
045                 color: #ccc; 
046             }
047             #saved {
048                 font-size:8pt;
049                 margin-left:5px;   
050             }
051         </style>
052     </head>
053     <body>
054         <div id="tb">
055             <input type="button" value="Save" onclick="Save()" /><span id="saved"></span>
056             <a href="preview.php?<?=$f?>" target="_blank" style="float:right;font-size:8pt">[Preview]</a>
057         </div>
058         <div style="display: flex;height:90%">
059             
060             <div id="editor" contenteditable="true" onkeyup="LivePreview()" placeholder="Your HTML Code"></div>
061
062             <div id="preview" placeholder="Preview Area"></div>
063         </div>
064
065         <script>
066             var editor = document.getElementById("editor");
067             var preview = document.getElementById("preview");
068             var IsSaved = true;
069             editor.focus();
070             function LivePreview() {
071                 preview.innerHTML = editor.innerText;
072                 IsSaved = false;
073             }
074             function Save() {
075                 var xhttp = new XMLHttpRequest();
076                 xhttp.onreadystatechange = function() {
077                     if (this.readyState == 4 && this.status == 200) {
078                         if (xhttp.responseText == "1") {
079                             document.getElementById("saved").style.color = 'green';
080                             document.getElementById("saved").innerText = "Last saved at " + new Date() ;
081                             IsSaved = true;
082                         } else {
083                             ShowError();
084                         }
085                     } 
086                 };
087                 var formData = new FormData();
088                 formData.append("c", editor.innerText);
089                 xhttp.open("POST", "<?= $_SERVER["PHP_SELF"]. "?$f" ?>", true);
090                 xhttp.send(formData);
091
092             }
093             setInterval(() => {
094                 if (!IsSaved) {
095                     Save();
096                 }
097             }, 5000);
098
099             ShowError = function() {
100                 var ele = document.getElementById("saved");
101                 ele.style.color = 'red';
102                 ele.innerText = "Couldn't Auto-save. Will retry soon" ;
103             }
104             window.onload = function() {
105                 <?php
106                     $content = "";                
107                     if ( $_SERVER['REQUEST_METHOD'] != 'POST' ) {
108                         if (file_exists($fn)) {
109                             $content = file_get_contents($fn);
110                         } 
111                         echo "editor.innerText = `$content`;";
112                     }
113                 ?>
114                 LivePreview();
115             }
116             
117         </script>
118     </body>
119 </html>
120
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