I am working on MVC 5 visual studio 15. My application needs to display a PDF file from byte array in an iframe. For this I am using following javascript. But this is not working. Anyone please tell me the mistake I am doing.
$(document).ready(function () {
$.ajax({
async: false,
cache: false,
type: "POST",
url: "@(Url.RouteUrl("GetAnyRespons"))",
responseType: 'arraybyte',
success: function (JsonCP) {
var data = JsonCP.responseModel.response.ResponseImage;
var file = new Blob([data], { type: 'application/pdf' });
var fileURL = URL.createObjectURL(file);
var iframe = document.createElement('iframe');
iframe.className = 'responseframe';
iframe.src = fileURL;
$('#response').append(iframe);
alert('response Loaded.');
},
error: function (xhr, ajaxOptions, thrownError) {
alert(thrownError + ' Failed to retrieve response.');
}
});
});
<div id="container">
<div id="response">
</div>
<div id="marks"></div>
</div>
The byte array with some other data is passed to client after converting into JSON data by the controller.
[System.Web.Http.HttpPost]
public ActionResult GetAnyRespons()
{
DownloadResponseModel rm = new DownloadResponseModel();
JsonResult jsonResult = Json(rm, JsonRequestBehavior.AllowGet);
jsonResult.MaxJsonLength = int.MaxValue;
return jsonResult;
}
The byte array is read from the database by the following function.
public int getFStreamResponse(System.Guid guid)
{
SqlConnection sqlConnection = new SqlConnection();
sqlConnection.ConnectionString = "Data
Source=HOME\\MSQLEXPRESS2016;Initial Catalog=Evaluation;Integrated
Security=True";
sqlConnection.Open();
SqlCommand sqlCommand = new SqlCommand();
sqlCommand.Connection = sqlConnection;
sqlCommand.Transaction = sqlConnection.BeginTransaction();
sqlCommand.CommandText = "SELECT GET_FILESTREAM_TRANSACTION_CONTEXT
()";
sqlCommand.CommandType = System.Data.CommandType.Text;
byte[] transactionContext = (byte[]) sqlCommand.ExecuteScalar();
SqlParameter parameter;
sqlCommand.CommandText = "SELECT [AllPagesAnotted],
[MarkedPercentage],[Mark], [RegdNo],[QuestionPaperId],[Assigned],
[Evaluated],[ResponseImage].PathName() AS FilePath FROM Responses
WHERE [ResponseId] = @Id";
sqlCommand.CommandType = System.Data.CommandType.Text;
parameter = new System.Data.SqlClient.SqlParameter("@Id",
System.Data.SqlDbType.UniqueIdentifier);
parameter.Value = guid;
sqlCommand.Parameters.Add(parameter);
SqlDataReader reader = sqlCommand.ExecuteReader();
reader.Read();
this.response.AllPagesAnotted =(bool)reader["AllPagesAnotted"];
this.response.MarkedPercentage= (int)reader["MarkedPercentage"];
this.response.Mark= (int)reader["Mark"];
this.response.RegdNo = (string)reader["RegdNo"];
this.response.QuestionPaperId = (int)reader["QuestionPaperId"];
this.response.Assigned = (bool)reader["Assigned"];
this.response.Evaluated = (bool)reader["Evaluated"];
this.response.ResponseId = guid;
string filePathInServer = (string)reader["FilePath"];
reader.Close();
SqlFileStream sqlFileStream = new System.Data.SqlTypes.SqlFileStream
(filePathInServer, (byte[])transactionContext,
System.IO.FileAccess.Read);
this.response.ResponseImage = new byte[sqlFileStream.Length];
sqlFileStream.Seek(0L, System.IO.SeekOrigin.Begin);
int byteAmount = sqlFileStream.Read
(this.response.ResponseImage, 0, (int)sqlFileStream.Length);
sqlFileStream.Close();
sqlCommand.Transaction.Commit();
return byteAmount;
}
您的AJAX调用正在执行HTTP GET请求,并且您的JsonResult GetAnyRespons()使用HTTP POST装饰。
The problem can be solved, if we use jpg instead of pdf. The following code displays jpg of multiple pages.
$(document).ready(function (JsonCP) {
$.ajax({
async: false,
cache: false,
type: "POST",
dataType: "json",
url: "@(Url.RouteUrl("GetAnyRespons"))",
success: function (JsonCP) {
base64String =
base64js.fromByteArray(JsonCP.responseModel.response.ResponseImage);
imgid = 'but1';
span = document.createElement('span');
var but = ($('<input>').attr('type', "image")
.attr('id', imgid)
.attr('src', "data:image/jpg;base64," + base64String)
.attr('width','900px')
).appendTo(span);
$('#response1').append(span);
},
error: function (xhr, ajaxOptions, thrownError) {
alert(thrownError + ' Failed to retrieve response.');
}
});
});
</script>
</head
<body>
<div class="outerdiv" >
<div id="response1" ></div>
</div>
</body>
</html>
.outerdiv{
overflow-y: scroll;
overflow-x:hidden;
height: 1100px;
width:900px;
}
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