HTML and CSS Reference
In-Depth Information
ShowPreview()
creates a
FileReader
object. Because XML files are essentially text files, the
readAsText()
method is used to read the files. The
load
event handler of the
FileReader
accesses the XML
file content using the
result
property. The XML file may be very large, and for preview purposes only part
of the file (up to 500 characters) is extracted. The
title
attribute of the underlying anchor element is then
set to the extracted XML data.
The
HidePreview()
function doesn't do anything special in this case because the browser
automatically hides the tooltip when mouse pointer leaves a hyperlink under consideration.
The task of uploading the XML files to the server is accomplished by the
UploadFiles()
function,
shown in Listing 9-30.
Listing 9-30.
UploadFiles()
Function
function UploadFiles() {
var data = new FormData();
for (var i = 0; i < files.length; i++) {
if (files[i].type == "text/xml") {
data.append(files[i].name, files[i]);
}
}
$.ajax({
type: "POST",
url: "/Upload/UploadFiles",
contentType: false,
processData: false,
data: data,
success: function (result) {
$("#errors").empty();
$("#errors").html(result);
},
error: function () {
alert("There was error uploading iles!");
}
});
}
UploadFile()
iterates through the selected files and appends only the XML files to a
FormData
object.
The
$.ajax()
method then makes a
POST
request to the
UploadFiles()
action method of the
Upload
controller. The
contentType
and
processData
options are set to
false
as before. If there are any schema
validation errors, they're displayed in a
<div>
element.
The
UploadFiles()
action method that saves and validates the XML files is shown in Listing 9-31.
Listing 9-31.
UploadFiles()
Action Method
[HttpPost]
public JsonResult UploadFiles()
{
if (Request.Files.Count > 0)
{
HttpFileCollectionBase files = Request.Files;
foreach (string key in files)
{
HttpPostedFileBase file = files[key];
