How to check if the tab page is dirty and prompt the user to save before navigating away using ajaxtoolkit tab control in ASP.NET
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on Microsoft .NET Support Team
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Published on Tue, 29 Jun 2010 13:58:00 +0000
Indexed on
2011/01/11
9:57 UTC
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AJAX
|.NET Tips and Tricks
Step 1: Put a hidden variable in Update panel
<asp:HiddenField ID="hfIsDirty" runat="server" Value="0" />
Step 2: Put the following code in ajaxcontrol tool kit tabcontainer OnClientActiveTabChanged="ActiveTabChanged"
Copy the following script in the aspx page.
<script type="text/javascript">
//Trigger Server side post back for the Tab container
function ActiveTabChanged(sender, e) {
__doPostBack('<%= tcBaseline.ClientID %>', '');
}
//Sets the dirty flag if the page is dirty
function setDirty() {
var hf = document.getElementById("<%=hfIsDirty.ClientID%>");
if (hf != null)
hf.value = 1;
}
//Resets the dirty flag after save
function clearDirty() {
var hf = document.getElementById("<%=hfIsDirty.ClientID%>");
hf.value = 0;
}
function showMessage() { return "page is dirty" }
function setControlChange() {
if (typeof (event.srcElement) != 'undefined')
{ event.srcElement.onchange = setDirty; }
}
function checkDirty() {
var tc = document.getElementById("<%=tcBaseline.ClientID%>");
var hf = document.getElementById("<%=hfIsDirty.ClientID%>");
if (hf.value == "1") {
var conf = confirm("Do you want o loose unsaved changes? Please Cancel to stay on page or OK to continue ");
if (conf) {
clearDirty();
return true;
}
else {
var e = window.event;
e.cancelBubble = true;
if (e.stopPropagation) e.stopPropagation();
return false;
}
}
else
return true;
}
document.body.onclick = setControlChange;
document.body.onkeyup = setControlChange;
var onBeforeUnloadFired = false;
// Function to reset the above flag.
function resetOnBeforeUnloadFired() {
onBeforeUnloadFired = false;
}
function doBeforeUnload() {
var hf = document.getElementById("<%=hfIsDirty.ClientID%>");
// If this function has not been run before...
if (!onBeforeUnloadFired) {
// Prevent this function from being run twice in succession.
onBeforeUnloadFired = true;
// If the form is dirty...
if (hf.value == "1") {
event.returnValue = "If you continue you will lose any changes that you have made to this record.";
}
}
window.setTimeout("resetOnBeforeUnloadFired()", 1000);
}
if (window.body) {
window.body.onbeforeunload = doBeforeUnload;
}
else
window.onbeforeunload = doBeforeUnload;
</script>
Step 3:
Here is how the tabcontrol should look like
<asp:UpdatePanel ID="upTab" runat="server" UpdateMode="conditional">
<ContentTemplate>
<ajaxtoolkit:TabContainer ID="tcBaseline" runat="server" Height="400px" OnClientActiveTabChanged="ActiveTabChanged">
<ajaxtoolkit:TabPanel ID="tpPersonalInformation" runat="server">
<HeaderTemplate>
<asp:Label ID="lblPITab" runat="server" Text="<%$ Resources:Resources, Baseline_Tab_PersonalInformation %>"
onclick="checkDirty();"></asp:Label>
</HeaderTemplate>
<ContentTemplate>
<asp:PlaceHolder ID="PlaceHolder1" runat="server"></asp:PlaceHolder>
</ContentTemplate>
</ajaxtoolkit:TabPanel>
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