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The client js determines the file type and file size, that is, the size of the upload is limited.

Source: Internet
Author: User
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Due to project needs! The script is required to determine the size and file type on the client! I have worked hard to find information on the Internet! Simply write an example and test the file upload size limit. compatible with browsers such as ie6, ie7, ie8, Google Chrome, and ff.
Copy codeThe Code is as follows:
<Html>
<Head>
<Meta http-equiv = "Content-Type" content = "text/html; charset = UTF-8"/>
<Script type = "text/javascript">
Var isIE =/msie/I. test (navigator. userAgent )&&! Window. opera;
Function fileChange (target, id ){
Var fileSize = 0;
Var filetypes = [". jpg ",". png ",". rar ",". txt ",". zip ",". doc ",". ppt ",". xls ",". pdf ",". docx ",". xlsx "];
Var filepath = target. value;
Var filemaxsize = 1024*2; // 2 M
If (filepath ){
Var isnext = false;
Var fileend = filepath. substring (filepath. indexOf ("."));
If (filetypes & filetypes. length> 0 ){
For (var I = 0; I <filetypes. length; I ++ ){
If (filetypes [I] = fileend ){
Isnext = true;
Break;
}
}
}
If (! Isnext ){
Alert ("this file type is not accepted! ");
Target. value = "";
Return false;
}
} Else {
Return false;
}
If (isIE &&! Target. files ){
Var filePath = target. value;
Var fileSystem = new ActiveXObject ("Scripting. FileSystemObject ");
If (! FileSystem. FileExists (filePath )){
Alert ("the attachment does not exist. Please enter it again! ");
Return false;
}
Var file = fileSystem. GetFile (filePath );
FileSize = file. Size;
} Else {
FileSize = target. files [0]. size;
}

Var size = fileSize/1024;
If (size> filemaxsize ){
Alert ("the attachment size cannot be greater than" + filemaxsize/1024 + "M! ");
Target. value = "";
Return false;
}
If (size <= 0 ){
Alert ("the attachment size cannot be 0 MB! ");
Target. value = "";
Return false;
}
}
</Script>
</Head>
<Body>
<Input type = "file" name = "contractFileName" style = "width: 500px;" onchange = "fileChange (this);"/>
</Body>
</Html>

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Related Keywords:
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