I found an article by Scott Mitchell, but it is very old and I was woundering if there is a more updated way to do this in asp.net 2.0, .net 3.5 sp1, and vb.net
I need to prompt a user to save if they have made a change to a control on a page.
I added the JQuery and DirtyForm script files to my project. I added the script you provided to my asp page, but when I try to open the page I get an Errror Microsoft JScript runtime error: '$' is undefined.
I got the code to work, however I don't get how it stops the user from exiting the page if a change is not saved. I'm using your example code and it prompts if they try to save and nothing was changed, but
how do I prompt them to save unsaved changes?
My button on my page looks like this:
<asp:Button ID="cmdSave2" OnClick="SubmitUpdate_Click" OnClientClick="return Save();"
runat="server" Text="Update" ToolTip="Save your changes"></asp:Button>
Here is the script code I'm using:
<script src="../../jquery-1.6.2.min.js" type="text/javascript"></script>
<script src="../../jquery.dirtyform.js" type="text/javascript"></script>
<script language="javascript" type="text/javascript">
var isDirty = false;
$(document).ready(function () {
$('#<%= Me.Form.ClientID %>')
.dirty_form()
.dirty(function (event, data) {
isDirty = true;
});
});
function Save() {
if (!isDirty) {
alert("You didn't change anything");
return false;
}
return true;
}
</script>
<script runat="server">
Protected Sub Save(ByVal sender As Object, ByVal e As EventArgs)
Me.lblUpdateTime.Text = String.Format("Last Updated On: {0}", DateTime.Now.ToString("hh:mm:ss"))
End Sub
If you want to handle the page being exited no matter what (refreshed, closed, navigated away, etc.), then you should use window.onbeforeunload. I believe that if you return string value, the default window alert will be shown asking the user if they really
want to leave the page. Otherwise, I don't think you can handle the page exit and stop it, unless you use onbeforeunload. You can still use the .dirty stuff, but it's just as easy to handle the .change() of all form inputs and change a "isDirty" boolean. In
the onbeforeunload, you would check "isDirty" and decide to alert the user or not (return a string). Just Google the onbeforeunload event, there's plenty out there.
If the dirtyFrom is designed to provide the functionality I'm looking for, why would I look to any other method? I just need to know if it was designed to work with MasterPages and if yes, how I might modify the id of the form to work with it.
Well, so far, I haven't seen any demos that actually alert the user when something isn't "saved", whatever that means. All I've seen it do is tell if there are any changed elements. What I'm saying is that you can use this or a MUCH simpler solution. But
using onbeforeunload is the way to detect a page being left, and check if anything was changed.
Master Pages have NOTHING to do with the client. Javascript and jQuery were designed for all web pages...it's up to you to learn/understand how to implement them. Master Pages are no different than a normal web page when it is sent to the browser, so you
can't use that as an excuse.
Jackxxx
Contributor
3060 Points
2788 Posts
How can I prompt a user to Save when exiting a page
Jul 30, 2011 05:35 PM|LINK
I found an article by Scott Mitchell, but it is very old and I was woundering if there is a more updated way to do this in asp.net 2.0, .net 3.5 sp1, and vb.net
I need to prompt a user to save if they have made a change to a control on a page.
Jackxxx
Jeev
All-Star
24182 Points
3719 Posts
Re: How can I prompt a user to Save when exiting a page
Jul 30, 2011 05:51 PM|LINK
You would need to use Javascript to do that so take a look at using Jquery to do that
http://cfsilence.com/blog/client/index.cfm/2009/10/12/jQuery-Method-To-Prompt-A-User-To-Save-Changes-Before-Leaving-Page
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
If you get the answer to your question, please mark it as the answer.
Charith Guna...
Star
14958 Points
1854 Posts
Re: How can I prompt a user to Save when exiting a page
Jul 30, 2011 05:53 PM|LINK
Hello,
you can use jQuery dirty form plugin.
<script src="Scripts/jquery-1.4.1.min.js" type="text/javascript"></script> <script src="Scripts/jquery-dirtyform.js" type="text/javascript"></script> <script language="javascript" type="text/javascript"> var isDirty = false; $(document).ready(function () { $('#<%= this.Form.ClientID %>') .dirty_form() .dirty(function (event, data) { isDirty = true; }); }); function Save() { if (!isDirty) { alert("You didn't change anything"); return false; } return true; } </script>Full article can be found here
Example (Save only changes can be found here)
Charith Gunasekara | FAQ
Jackxxx
Contributor
3060 Points
2788 Posts
Re: How can I prompt a user to Save when exiting a page
Jul 30, 2011 11:21 PM|LINK
I added the JQuery and DirtyForm script files to my project. I added the script you provided to my asp page, but when I try to open the page I get an Errror Microsoft JScript runtime error: '$' is undefined.
Any suggestions
Jackxxx
Jackxxx
Contributor
3060 Points
2788 Posts
Re: How can I prompt a user to Save when exiting a page
Jul 31, 2011 09:56 PM|LINK
I got the code to work, however I don't get how it stops the user from exiting the page if a change is not saved. I'm using your example code and it prompts if they try to save and nothing was changed, but how do I prompt them to save unsaved changes?
My button on my page looks like this:
<asp:Button ID="cmdSave2" OnClick="SubmitUpdate_Click" OnClientClick="return Save();" runat="server" Text="Update" ToolTip="Save your changes"></asp:Button>Here is the script code I'm using:
<script src="../../jquery-1.6.2.min.js" type="text/javascript"></script> <script src="../../jquery.dirtyform.js" type="text/javascript"></script> <script language="javascript" type="text/javascript"> var isDirty = false; $(document).ready(function () { $('#<%= Me.Form.ClientID %>') .dirty_form() .dirty(function (event, data) { isDirty = true; }); }); function Save() { if (!isDirty) { alert("You didn't change anything"); return false; } return true; } </script> <script runat="server"> Protected Sub Save(ByVal sender As Object, ByVal e As EventArgs) Me.lblUpdateTime.Text = String.Format("Last Updated On: {0}", DateTime.Now.ToString("hh:mm:ss")) End SubJackxxx
Jackxxx
Contributor
3060 Points
2788 Posts
Re: How can I prompt a user to Save when exiting a page
Jul 31, 2011 11:55 PM|LINK
It's still not working, could it be because I'm using a masterpage?
Anyone have any suggestions?
Jackxxx
Jackxxx
Contributor
3060 Points
2788 Posts
Re: How can I prompt a user to Save when exiting a page
Aug 01, 2011 08:54 PM|LINK
Anyone have any ideas?
Jackxxx
hoodedperson...
Star
12950 Points
3196 Posts
Re: How can I prompt a user to Save when exiting a page
Aug 01, 2011 10:24 PM|LINK
If you want to handle the page being exited no matter what (refreshed, closed, navigated away, etc.), then you should use window.onbeforeunload. I believe that if you return string value, the default window alert will be shown asking the user if they really want to leave the page. Otherwise, I don't think you can handle the page exit and stop it, unless you use onbeforeunload. You can still use the .dirty stuff, but it's just as easy to handle the .change() of all form inputs and change a "isDirty" boolean. In the onbeforeunload, you would check "isDirty" and decide to alert the user or not (return a string). Just Google the onbeforeunload event, there's plenty out there.
Jackxxx
Contributor
3060 Points
2788 Posts
Re: How can I prompt a user to Save when exiting a page
Aug 01, 2011 10:38 PM|LINK
If the dirtyFrom is designed to provide the functionality I'm looking for, why would I look to any other method? I just need to know if it was designed to work with MasterPages and if yes, how I might modify the id of the form to work with it.
Jackxxx
hoodedperson...
Star
12950 Points
3196 Posts
Re: How can I prompt a user to Save when exiting a page
Aug 01, 2011 11:02 PM|LINK
Well, so far, I haven't seen any demos that actually alert the user when something isn't "saved", whatever that means. All I've seen it do is tell if there are any changed elements. What I'm saying is that you can use this or a MUCH simpler solution. But using onbeforeunload is the way to detect a page being left, and check if anything was changed.
Master Pages have NOTHING to do with the client. Javascript and jQuery were designed for all web pages...it's up to you to learn/understand how to implement them. Master Pages are no different than a normal web page when it is sent to the browser, so you can't use that as an excuse.