How to pass hidden values with ajax upload form - html

Question

I'm busying with passing some values of hidden input with an ajax form. I've tried may ways but it looks like the values didn't go through.
HTML
<form id="upload_form" enctype="multipart/form-data" method="post">
<input type="hidden" name="sid" value="$rec_sStdi[std_sid]" />
<input type="hidden" name="stid" value="$rec_sStdi[stdi_sid]" />
<input type="text" name="title" class="form-control" size="50" maxlength="128" autocomplete="off" placeholder="ชื่อไฟล์ เช่น แบบประเมินครู เป็นต้น"/>
<progress id="progressBar" value="0" max="100" style="width:100%;"></progress>
<button class="btn btn-primary btn-xs pull-right" type="button" value="Upload File" onclick="uploadFile()"><i class="glyphicon glyphicon-upload"></i> อัพโหลด</button>
<input type="file" name="file1" id="file1" class="btn btn-danger btn-xs pull-right">
<b id="status"></b>
<p id="loaded_n_total"></p>
</form>
Javascript
function _(el){
return document.getElementById(el);
}
function uploadFile(){
var file = _("file1").files[0];
//alert(file.name+" | "+file.size+" | "+file.type);
var formdata = new FormData();
formdata.append("file1", file);
var ajax = new XMLHttpRequest();
ajax.upload.addEventListener("progress", progressHandler, false);
ajax.addEventListener("load", completeHandler, false);
ajax.addEventListener("error", errorHandler, false);
ajax.addEventListener("abort", abortHandler, false);
ajax.open("POST", "inc/eval_file_upload.php");
ajax.send(formdata);
}
function progressHandler(event){
_("loaded_n_total").innerHTML = "Uploaded "+event.loaded+" bytes of "+event.total;
var percent = (event.loaded / event.total) * 100;
_("progressBar").value = Math.round(percent);
_("status").innerHTML = Math.round(percent)+"% uploaded... please wait";
}
function completeHandler(event){
_("status").innerHTML = event.target.responseText;
_("progressBar").value = 0;
}
function errorHandler(event){
_("status").innerHTML = "Upload Failed";
}
function abortHandler(event){
_("status").innerHTML = "Upload Aborted";
}
PHP (eval_file_upload.php)
<?
$sid=$_POST['sid'];
$stid=$_POST['stid'];
$title=$_POST['title'];
$fileName = $_FILES["file1"]["name"]; // The file name
$fileTmpLoc = $_FILES["file1"]["tmp_name"]; // File in the PHP tmp folder
$fileType = $_FILES["file1"]["type"]; // The type of file it is
$fileSize = $_FILES["file1"]["size"]; // File size in bytes
$fileErrorMsg = $_FILES["file1"]["error"]; // 0 for false... and 1 for true
if (!$fileTmpLoc) { // if file not chosen
echo "ERROR: Please browse for a file before clicking the upload button.";
exit();
}
if(move_uploaded_file($fileTmpLoc, "../files/$fileName")){
echo "\"$fileName\" upload is complete (sid:$sid , stid:$stid, title:$title)";
} else {
echo "move_uploaded_file function failed";
}
?>
I tried to test the passing by echoing the hidden values. But nothing shows up.
ref : http://www.developphp.com/view.php?tid=1351

Answer 1

Try to add the params in your ajax call:
sid = document.getElementById("sid").value;
stid = document.getElementById("stid").value;
formdata.append("sid", sid);
formdata.append("stid", stid);
And adds an id to your input type hidden.
<input type="hidden" id="sid" name="sid" value="$rec_sStdi[std_sid]" />
<input type="hidden" id="stid" name="stid" value="$rec_sStdi[stdi_sid]" />