2023-12-04 \u8a18\u8f09
\u6982\u8981 : HTML\u30da\u30fc\u30b8\u3067\u5e38\u306b\u4fdd\u5b58\u3055\u308c\u308btextarea\u3092Ajax\u3067\u5b9f\u88c5
Keyword : XMLHttpRequest, POST<\/p>\n\n\n\n
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<?php\n\n \/\/Ajax Save\u7528\n $ajax = ($_REQUEST['ajax'] ?? '');\n if ($ajax === 'save') {\n if (!file_put_contents('.\/myfile.txt', $_REQUEST['text'])) {\n echo 'SAVE ERROR!!';\n }\n exit;\n }\n\n \/\/\u521d\u56de\u30d5\u30a1\u30a4\u30eb\u8aad\u307f\u51fa\u3057\n function readText() {\n echo trim(htmlspecialchars(file_get_contents('.\/myfile.txt')));\n }\n?>\n<!doctype html>\n<html lang="ja">\n<head>\n <meta charset="UTF-8">\n <title>TextFileAjaxSave<\/title>\n<\/head>\n<body>\n <div id="result">Auto Save<\/div>\n <form method="post" action="">\n <textarea id="text" cols="80" rows="40"><?=readText();?><\/textarea>\n <\/form>\n<\/body>\n<script>\n let mv_hasChange = false;\n const elem_text = document.getElementById('text');\n const req = new XMLHttpRequest();\n req.addEventListener('readystatechange', httpRequest_readystatechange);\n elem_text.addEventListener('input', () => { mv_hasChange = true; });\n setInterval(ajaxsaveText, 1000);\n\n function ajaxsaveText() {\n if (mv_hasChange) {\n \/\/\u5909\u66f4\u304c\u3042\u3063\u305f\u5834\u5408\u306fAjax\u4fdd\u5b58\u3059\u308b\n req.open('POST', '');\n req.setRequestHeader('Cache-Control', 'no-cache');\n req.setRequestHeader('content-type', 'application\/x-www-form-urlencoded;charset=UTF-8');\n req.send('ajax=save&text=' + encodeURIComponent(elem_text.value));\n mv_hasChange = false;\n }\n }\n\n function httpRequest_readystatechange() {\n \/\/\u4fdd\u5b58\u30a8\u30e9\u30fc\u304c\u3042\u3063\u305f\u5834\u5408\u306f\u8868\u793a\u3059\u308b\n if (req.responseText.length) document.getElementById('result').innerText = req.responseText;\n }\n\n<\/script>\n<\/html><\/code><\/pre><\/div>\n\n\n\n encodeURIComponent \u306f \u5024\u306e\u307f\u3092\u304f\u304f\u308b\u3053\u3068\u3002
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