Js dynamically creates an upload form using iframe to simulate Ajax implementation without refreshing _ javascript tips-js tutorial

Source: Internet
Author: User
Tags temporary file storage
This article describes how to dynamically create an upload form by using iframe to simulate Ajax refreshing. For more information, see The Code is as follows:


Script
Window. onload = function (){
Upfile ('file. php ');
}


/*
** Url path
**/
Function upfile (url ){
// Create an iframe
Var iframe = document. createElement ("iframe ");
Document. body. appendChild (iframe );
Iframe. id = 'iframename ';
Iframe. name = 'iframename ';
Iframe. style. display = 'none ';
// Create a form
Var turnForm = document. createElement ("form ");
Document. body. appendChild (turnForm );
TurnForm. method = 'post ';
TurnForm. action = url;
TurnForm. encoding = "multipart/form-data ";
TurnForm. name = 'formnamer ';
TurnForm.tar get = 'iframename ';
// Create a hidden form
Var newElement = document. createElement ("input ");
NewElement. setAttribute ("name", "inputname ");
NewElement. setAttribute ("type", "file ");
NewElement. setAttribute ("value ",'');
TurnForm. appendChild (newElement );
}

// Form submission
Function formSubmit (){
// Var res = document. formNamer. inputname. value;
Document. formNamer. submit ();
}

// Return Value
Function callback (result ){
// Parse response parent.doc ument. getElementById ('iframename'). style. display = 'block'; view background data through iframe
If (result ['error'] = 0 ){
Document. getElementById ('test'). src = result ['img '] [1] +'/'+ result ['img'] [2];
} Else if (result ['error'] = 1 ){
Alert (result ['meg']);
} Else if (result ['error'] = 2 ){
Alert (result ['meg']);
} Else if (result ['error'] = 3 ){
Alert (result ['meg']);
} Else if (result ['error'] = 4 ){
Alert (result ['meg']);
} Else {
Alert (result ['meg']);
}

}

Script

Upload


File. php

The Code is as follows:


Header ("content-Type: text/html; charset = Utf-8 ");

If (@ is_uploaded_file ($ _ FILES ['inputname'] ['tmp _ name']) {

$ F = $ _ FILES ['inputname'];
$ Name = $ f ["name"];
$ Size = $ f ["size"];
$ Type = $ f ["type"];
$ FileName = $ f ["tmp_name"];

Switch ($ type ){
Case 'image/jpg ': $ okType = true;
Break;

Case 'image/jpeg ': $ okType = true;
Break;

Case 'image/png ': $ okType = true;
Break;

Case 'image/gif': $ okType = true;
Break;
}

If ($ okType ){
$ Error = $ f ["error"];
Echo 'file name: '. $ name .'
';
Echo 'file type: '. $ type .'
';
Echo 'file size: '. round ($ size/1024).' K
';
Echo 'temporary file storage path: '. $ fileName .'
';

$ FileDir = dirname (_ FILE _). '/img/upfile'. time (). $ name;
$ Img = explode ('/', $ fileDir );

Move_uploaded_file ($ fileName, $ fileDir );

$ Data = array ();
$ Data ['img '] = $ img;
$ Data ['name'] = $ name;
$ Data ['type'] = $ type;
$ Data ['SIZE'] = $ size;
$ Data ['filename'] = $ filename;
$ Data ['filedir'] = $ fileDir;

If ($ error = 0 ){
/* Echo 'upload successful! ';
Echo 'preview :';
Echo"
";
Echo 'file name'. $ img [2]; */
$ Data ['error'] = 0;
Exit ("script" parent. callback (". json_encode ($ data)."); script ");

} Elseif ($ error = 1 ){
$ Data ['error'] = 1;
$ Data ['meg'] = 'exceeds the file size. Set' in the php. ini file ';
Exit ("script" parent. callback (". json_encode ($ data)."); script ");
} Elseif ($ error = 2 ){
$ Data ['error'] = 2;
$ Data ['meg'] = 'exceeds the file size specified by the MAX_FILE_SIZE option ';
Exit ("script" parent. callback (". json_encode ($ data)."); script ");
} Elseif ($ error = 3 ){
$ Data ['error'] = 3;
$ Data ['meg'] = 'only part of the file is upload ';
Exit ("script" parent. callback (". json_encode ($ data)."); script ");
} Elseif ($ error = 4 ){
$ Data ['error'] = 4;
$ Data ['meg'] = 'No file is uploaded ';
Exit ("script" parent. callback (". json_encode ($ data)."); script ");
} Else {
$ Data ['meg'] = 'size of the uploaded file is 0 ';
Exit ("script" parent. callback (". json_encode ($ data)."); script ");
}

}
} Else {
$ Data ['error'] = 4;
$ Data ['meg'] = 'No file is uploaded ';
Exit ("script" parent. callback (". json_encode ($ data)."); script ");
}
?>

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