Web Forms :: Warn User When Leaving A Page With Changed Data?
Jan 28, 2010
I'd like to know how I can warn a user when they're leaving a page where they've changed data (i.e. "You have unsaved data on this page, are you sure you want to abanon it?"). For example, the page has a few dropdown lists, some textboxes, etc. I'd like to warn them if they try to leave the page before saving the data. How can I do this? To add to my confusion, I also have a dropdown menu control (skmMenu) on the page that doesn't seem to have any events I can tie into.
I have four panels on a page, each with a submit button. I want to warn the user when they move from one panel to another without having submitted any changes from the first panel. I've worked this out in Javascript but it would be better to do on the server side, and disable all submits except the panel with changed content. How would I do this? With a Sub that responds to ontextchanged? Or with comparison validator? Or some combination of the two?
I have to warn the user when leaving the gridview row in edit mode without saving or cancelling the data. How can I achieve this? I have a javascript function which simply prompts the user when he/she leaves the screen which is not serving the purpose.
I'm getting this error code in a voting system which I made.
"Violation of PRIMARY KEY constraint 'PK_Awards'. Cannot insert duplicate key in object 'dbo.Awards'. The statement has been terminated."
It's good because it means I am stopping people from voting twice, however, I want to display an error message in the site, and I want to make this occurance user friendly, as I have no idea how this error will look when the website is live.
Here is all of my code:
[Code]....
How will this error look when the website is live? How can I display a message to warn the user that he has already voted?
I have several functions running on a postback that can take a little time to complete.When postback is initiated I show a loading image with this code:
[Code]....
I want to be able to add code to this function so if user tries to leave at this point they are informed the operation is not complete.I found this code:
[Code]....
This works but I only want the code to be active when the loading image is active.I tried the following but it shows the alert message when the page eventually posts back:
Im trying to find out how to use the web user control .ascx with the Aspx page..
Yes I do know how to create this and drag it into the aspx page...
But I want to go a step further ,...
I want to use a dropdownlist in the aspx page
Gridview in ascx thats databind in the ascx.vb file
...........then when selecting a value in the dropdownlist (in aspx)....it changes the sql query in the ascx file and show the new data in the user control..
I have tried to look for examples...everything I found was not making sense..poor explained and the codes where all in C#..so when converting it the examples dont even work..
been researching for whole day yesterday...cant find any codes thats working...:(
I have Gridview which allows user to edit record.I already build the event to save the new record, time and user machine information to a log database.However, this means a whole record is saved to the log... if the user just change one or two column/field out of say 20 fields, then there is a lot of waste. Also the change is not obvious.How can I log exactly which field(s) was changed in the record ?
I have a grid view where the user can change pages at either the top or the bottom of the grid view. I want the view to go back to the top whenever a user changes the page, whether they are changing from the top or the bottom. I've tried using anchors and javascript to achieve this but it does not work. The javascript is executed and the user is taken to the top of the gridview, this can be seen by placing an alert after the javascript to change the view. But the last thing that happens on the page change is that the window is returned to it's previous position (the bottom of the page). Is there any way of doing this?
My purpose is to modified some data only for current page in a gridview. I call this function in page load and GridView_PageIndexChanged events. When it's called in page load event, it works fine. But when it's called in PageIndexChanged event, only the rows on the first page in GridView are looped through. For example, if I click page 5, the rowStartIndex becomes 100 = 5 x 20 (my pagesize). The if condition becomes itemsRead >= 100 andAlso itemsRead < 120. But after itemsRead is increased to 19, the For each gridViewRow loop stops and the if condition is never satisfied.
But if I do that the current page will be erased and return blank to the user.
Other examples says to create "download.aspx" and request it by javascript, but on a this new page I won't have access to the ViewState data of the first page.
The point is, how can I create a file, launch the download and don't lose the current page status?
I have a session variable which contains a list of elements. The user defines filters, which are sent to the Database, which fills the object with the elements that match. Then, that list is shown in a table. The code goes something like this:
[Code]....
Inside that page there is a button, which sends the request given the user filters. The Server creates the object and the session variable is assigned a value.
[Code]....
It works when the user sets the filters. However, given that once done it, the session variable has a value, I don't understand why if you navigate to other pages, the table doesn't appear when you return, given that:
1. It works when you perform the query and reload the page
2. The Session variable should be set for the rest of the session
I'm pretty new at configuring IIS and working with SSL. I've been having difficulty with switching from the HTTPs protocol to the HTTP protocol. I had set a small part of our website to the HTTPS protocol since it has an SSL certificate for online commmerce.
When users go through that part of the site the HTPPS protocol is set and runs fine, but when they try to leave by, say, clicking on a link to another part of the site (after they have visited the secured portion of the site) the HTTPS stays in the url. Is there something I'm doing wrong?
This is how the HTTPS is set on the site: this code is placed in an sslredirect.asp page located in a "SSL" folder:
<% Response.Buffer = True If (Request.ServerVariables("HTTPS") = "off") Then sQ = Request.ServerVariables("QUERY_STRING") sURL = "https" & Right(sQ, (Len(sQ)-8)) sURL = Replace(sURL, ":80", "") Response.redirect(sURL) End if %>
This action has a pretty high likelyhood of throwing an exception (or at least not being able to return the file).
Due to the nature of the application (which contains a lot of dynamic content), I can't really redirect to an error page in this situation. The current page needs to stay open somehow.
So I'm ideally looking for something like a javascript pop-up, but afaik this isn't going to be possible since I don't know any way to return a javacript instruction in a non-ajaxed controller call. If I display an error page I need to force it to open in a new window some how. Is there any possible solution to this problem?
I'm trying to do databind with listview, datapager, and objectdatasource.When I just change the page number, it works correctly. But, when I sort a column and change the page number, it lost the sort expression. How do I fix the issue?
I have a gridview with paging. I have a style set for a selected row (highlights the row in light orange). What i would like to do is that each time a user chamges the page, the selectedIndex & selectedRow automatically becomes the 1st row of the selected page. So i would like to see the orange highlight on the 1st row of the page to indicate that the row has been selected.
I have tried GridView1.SelectedIndex=0 but this only seems to select the index of the 1st record in the whole datagrid. Does anyone know of how to set the 1st row of the page to the selected row each time the pageindex is changed?
I have 3 nested grids as Parent/Child/GrandChild and I have assigned SqlDataSources to all the grids at declaration time. I place the SqlDataSource next to each grid as follows.
Because of this I am not doing anything in RowDataBound(...) event. But I used the RowCreated(..)event of Parent and Child grids to access session (Please look at the select statements of Child/GrandChild grids).
Parent grid's RowCreated(..) event puts the value in the session which is used by Child grid. Child grid's RowCreated(..) event puts the value in the session which is used by Grand Child grid.
GrandChild grid has paging enabled and whenever I click on page index, Child and GrandChild grids goes blank. Parent gird doesn't go blank because its select statement doesn't take any "select parameters".
how to overcome this problem. I am attaching .aspx and .aspx.cs files
On Button click(postback), my dropdownlist of gridview is getting blank, so i m getting error of "Object Reference...." on the line "ddl.selecteditem.value"Also, dropdownlist's selectedindexchanged event is fired on Button Click(Page Postback), which is making the dropdownlist to go blank. AutoPostBack of dropdownlist is set as False,
I am showing a few textbox controls on a page and I have a Save and Cancel button. If the user makes a change to any of the textboxes and clicks cancel, then I want to prompt the confirm box if they want to cancel with data being changed. I can determine if data has changed by comparing session variables of the data to the actual values. And I know how to show a confirmation box using javascript. But it seems like I need to call this from the vb code rather that right there on the client?
I was asked if I could make some kind of alert to pop up 3 different statuses, a green light for - server good, a yellow light for - the server is experiencing technical difficulties and not may be running properly and a red light for - server is down.
So how would I go about doing that in an employees Intranet page so they can see if there is problems with the server if they are trying to log in and work.
I know they work with Visual Studio 2010 and probably work with IIS - so just in case if they work with Apache.
I Â have used two language "English" and "Arabic" in my website. My requirement is that if a user visit the english page(eg. Contact Us) of my website and he clicks on "Arabic" language then the same page (Contac Us) of arabic should display. How i will do it?
Will master page build in visualstudio 2008 express edition gets changed when the page is opened in visualstudio 2008 professinal edition?
I had created a sample master page in visualstudio 2008 express edition and when I opened the same website on other PC to work on it, I had observed that that alignment of <div> tags gets changed in the masterpage. Why this is happening?
