Javascript (Client/Server) _ javascript skills

This article describes how to use Javascript to determine whether a file exists on the client, server, or remote file. The sample code is as follows, for more information about how to use javascript to determine whether a file exists, see.

1. You can use

Var fso, s = filespec; // filespec = "C:/path/myfile.txt" fso = new ActiveXObject ("Scripting. fileSystemObject "); if (fso. fileExists (filespec) s + = "exists. "; else // www. jb51.nets + = "doesn't exist. "; alert (s );

2. You can use

Var xmlhttp = new ActiveXObject ("Microsoft. XMLHTTP "); xmlhttp. open ("GET", yourFileURL, false); xmlhttp. send (); if (xmlhttp. readyState = 4) {if (xmlhttp. status = 200) s + = "exists. "; // The url contains else if (xmlhttp. status = 404) s + = "doesn't exist. "; // The url does not exist in else s + =" "; // other statuses} // www. yuju100.comalert (s );

YesSetting contentEditable to false limits that users can only select files, rather than entering files at will.