How to control page redirection when downloading a file in asp.net?
Question
i am finding a challenge on controlling the page redirection. For demo purpose, i have created sample code.
it's simple aspx Page which contains one button and checkbox. On clicking the button, it will download a text file and enables the checkbox via javascript. On clicking the checkbox, it will redirect to different url.
Problem: In my application, On clicking the button, i would be fetching some data from database and send the details to PDF service (Different webservice) which returns byte array then it downloads a PDF file.This process would take 3 to 4 seconds.
Sometimes user is not waiting to downloading the file. moreover i am enabling the checkbox when click on the button. They click the checkbox which redirects the user to another link.
I want to make sure that user should redirect to different page only PDF download completes. Will it be possible to have control on the redirection?
aspx code:-
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:LinkButton id="link" runat="server" OnClick="link_OnClick" ClientIDMode="Static">sample link</asp:LinkButton>
<asp:CheckBox runat="server" id="chkAgree" OnCheckedChanged="chkAgree_OnCheckedChanged" ClientIDMode="Static" Text="I agree" AutoPostBack="True"/>
</div>
</form>
<script type="text/javascript">
window.onload = function() {
var btn = document.getElementById("link");
document.getElementById("chkAgree").checked = false;
document.getElementById("chkAgree").setAttribute('disabled', true);
btn.onclick = function(event) {
event.preventDefault();
document.getElementById("chkAgree").removeAttribute('disabled');
}
};
</script>
</body>
</html>
Code behind file:-
public partial class WebForm : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
}
private byte[] GetEmployeeAsByteArray()
{
var employee = new { id = 101, name = "steven" };
using (var m = new MemoryStream())
{
using (var writer = new BinaryWriter(m))
{
writer.Write(employee.id);
writer.Write(employee.name);
}
return m.ToArray();
}
}
protected void chkAgree_OnCheckedChanged(object sender, EventArgs e)
{
Response.Redirect("https://www.google.com");
}
protected void link_OnClick(object sender, EventArgs e)
{
var emp = GetEmployeeAsByteArray();
Response.ContentType = "text/plain";
Response.Headers.Add("Content-Disposition", "attachment; filename=\"employee.txt\"");
Response.BinaryWrite(emp);
Response.End();
}
}
1 answers
solution1
0 2021-01-14 14:23:54
with my understanding u can give a loader or some function which allows to check the box if the process is finished.
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