Question

<script type="text/javascript">
 function submitForm() {
  var thelang = document.getElementById('lang').options[document.getElementById('lang').selectedIndex].value;
window.location.href = window.location.pathname + '?lang=' + thelang;
}
</script>

<?php session_start() ?>

<?php

require("config.php");

if(!isset($_GET['lang'])) {
	$lng = 'en';
}
else {
	$lng = $_GET['lang'];
}
?>
<html>
 <head>
  <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />

 </head>
 <body>
  <form action="<?php echo $_SERVER['PHP_SELF']; ?>" method="get">
   <label for="lang">Select Language:</label>
    <select id="lang" name="lang" onchange="submitForm()">
     <option value="en"<?php if( $_GET['lang'] != 'ar'){  echo " selected=\"selected\"";} ?> > English</option>
     <option value="ar"<?php if( $_GET['lang'] == 'ar'){  echo " selected=\"selected\"";} ?> >Arabic</option>
          
   </select>
     
</form>
<textarea cols="70" rows="5" readonly style="resize:none"><?php echo $trans['topnews']; ?> </textarea>


</body>

</html>

我是在PHP中实现翻译的新手。我有一个文本，它从数据库中加载内容。一旦选定的值为英语，文本区域为英语，一旦为阿拉伯语，文本区域内容为阿拉伯语。一切都工作得很好，但在选择任何语言之前第一次加载页面时我有一个错误（未定义索引：lang in C：\ xampp \ htdocs \ project \ shownews.php）当我选择一个值时，此错误不再显示

Answer 1

试试这个

 <option value="en"<?php if( $lng != 'ar'){  echo " selected=\"selected\"";} ?> > English</option>
 <option value="ar"<?php if( $lng == 'ar'){  echo " selected=\"selected\"";} ?> >Arabic</option>

如何为select选项设置默认值

1 个答案: