试了几种方法，都不行，到底如何判断

2012-06-20

试了几种方法，都不行，到底怎么判断HTML codehtmlheadmeta http-equivcontent-type contenttext/

试了几种方法，都不行，到底怎么判断

HTML code

<html><head><meta http-equiv="content-type" content="text/html; charset=UTF-8">      <meta http-equiv="Pragma" content="no-cache">      <link rel="stylesheet" href="wancfg_data/stylemain.css" type="text/css">         <link rel="stylesheet" href="wancfg_data/colors.css" type="text/css">            <script language="javascript"><!-- hidevar progress = 0;if (document.images){  pic1= new Image();  pic1.src="circle.gif";}function isInProgress() {   var bopregd = '1';   if ( progress == 0 )  {      if (bopregd == 1) {         progress = 1;         return true;      } else {         alert('No BOP registered, could not upgrade BOP firmware.');         return false;      }   }   alert('Upload frimware is in progress, please wait for a minute.');   return false;}// done hiding --></script>   </head>   <body>      <blockquote>         <form method="post" enctype="multipart/form-data" action="uploadbopfw.cgi" onsubmit="return isInProgress();">            <b class="gentitle">Management </b><br>            <br><br>            <table border="0" cellpadding="0" cellspacing="0">               <tbody><tr>                  <td>Firmware file:&nbsp;                  </td>                  <td><input name="filename" size="15" type="file"></td>               </tr>            </tbody></table>            <p align="center"><input value="Update Firmware" type="submit"></p>         </form>      </blockquote>   </body></html>

在没选文件的时候，直接点Update Firmware要提示。
到底怎么实现？

[解决办法]
function isInProgress() {
if(document.getElementsByTagName("input")[0].value==""){
alert("请先选择一个文件");
return false;
}
var bopregd = '1';
if ( progress == 0 ) {
if (bopregd == 1) {
progress = 1;
return true;
} else {
alert('No BOP registered, could not upgrade BOP firmware.');
return false;
}
}
alert('Upload frimware is in progress, please wait for a minute.');
return false;
}
[解决办法]

HTML code

<html><head><meta http-equiv="content-type" content="text/html; charset=UTF-8">      <meta http-equiv="Pragma" content="no-cache">      <link rel="stylesheet" href="wancfg_data/stylemain.css" type="text/css">         <link rel="stylesheet" href="wancfg_data/colors.css" type="text/css">            <script language="javascript"><!-- hidevar progress = 0;if (document.images){  pic1= new Image();  pic1.src="circle.gif";}function isInProgress() {if(document.getElementById("myfile").value == ""){alert('a');return false;}  //判断是否上传文件   var bopregd = '1';   if ( progress == 0 )  {      if (bopregd == 1) {         progress = 1;         return true;      } else {         alert('No BOP registered, could not upgrade BOP firmware.');         return false;      }   }   alert('Upload frimware is in progress, please wait for a minute.');   return false;}// done hiding --></script>   </head>   <body>      <blockquote>         <form method="post" enctype="multipart/form-data" action="uploadbopfw.cgi" onsubmit="return isInProgress();">            <b class="gentitle">Management </b><br>            <br><br>            <table border="0" cellpadding="0" cellspacing="0">               <tbody><tr>                  <td>Firmware file:&nbsp;                  </td>                  <td><input name="filename" size="15" type="file" id="myfile"></td>  //加了个ID               </tr>            </tbody></table>            <p align="center"><input value="Update Firmware" type="submit"></p>         </form>      </blockquote></body></html> 
 
[解决办法]
探讨

function isInProgress() {
   if(document.getElementsByTagName("input")[0].value==""){
alert("请先选择一个文件");
return false;
}
   var bopregd = '1';
   if ( progress == 0 )  {
      if (bopregd == 1……

热点排行

JavaScript

试了几种方法，都不行，到底如何判断