I have a check box in my page as follows:
<asp:CheckBox ID="chkPayerCB"
runat="server"
Text="Payer Core Banking details"
TextAlign="Right"/>
I need to disable it on Page Load event of the page. I wrote the following code in code behind:
chkPayerCB.Enabled = false;
Though the check box is disabled but it still gets checked for a moment on clicking at it and then gets unchecked.
Though it solves my purpose but I do not want it to be checked at any cost.
I am using VS 2008 Professional Edition (v 9.0.2). Please can anybody guide me on this.
You can use a different approach.
Set Enabled = False in the Designer.
If you need to enable it under some circustances you can use Page_Load event.
I have a visual web part (a simple form) with RequiredFieldValidators. But a problem has occured since the field validators block editing of the page. When i press Edit Page in Sharepoint it starts to load then the validators fire and the javascript is stopped.
I found a solution but i cant get it to work.
Like this
public override void CreateChildControls()
{
if(SPContext.Current.FormContext.FormMode == SPControlMode.Edit)
((UserControl)_ctl).EnableValidators(false);
((UserControl)_ctl).EnableValidators(true);
}
//But the _ctl does not exit i only have
Control control = Page.LoadControl(_ascxPath);
A litte advice would help this sharepoint noob a great deal.
The form is just Labels, Inputs, a button, updatepanel and requiredFieldValidators
Can you not just set the ValidationGroup for the validators and button? Like this: http://msdn.microsoft.com/en-us/library/ms227424.aspx
The validators should only fire when the button is pressed.
There is something wrong with your configuration - I tested this configuration and the required field validators definitely don't block editing on the page. Do you want to post your page and your code behind? Might help to troubleshoot the problem.
Iam trying to use System.Web.UI.WebControls.Calender.
But when I select any date , It post backs automatically. Is there any way to avoid this behavior.
(I dont see the usual property AutoPostback which I set to False to avoid this behavior)
I need the selected date only once user submits the form.
Note- I am using VS2008
I generally avoid avoid the MS calender control because I find it so hard to work with and style. Have you considered something like the jQuery UI date picker, works as you need and far easier to style after too.
http://jqueryui.com/demos/datepicker/#inline
It posts back to set the selected form on the UI. what you can do is use a client side calendar (like jquery ui) or use ajax calendar extender so it will not postback the whole page.
It is possible with MS Calendar. You can customize content of each cell in DayRender event:
protected void Calendar1_DayRender(object sender, DayRenderEventArgs e)
{
e.Cell.Text = e.Day.DayNumberText;
}
You can set e.Cell.Text to be div or span with text and javascript onclick event or link. You can put any HTML there.
You cannot disable "Autopostback" of the Standard Calendar control
I think you can use CalendarExtender from AjaxToolkit
<asp:TextBox ID="txtCalendarExtender" runat="server"></asp:TextBox>
<cc3:CalendarExtender ID="Calendar1" PopupButtonID="imgPopup" runat="server" TargetControlID="txtCalendarExtender" Format="dd/MM/yyyy">
</cc3:CalendarExtender>
Remember to add this code at the top of your page:
<%# Register Assembly="AjaxControlToolkit" Namespace="AjaxControlToolkit" TagPrefix="cc3" %>
Remember, there is a forum about this topic where PLBlum says:
The Calendar control included with ASP.NET uses postbacks only. If you added Microsoft ASP.NET AJAX to the page and put the calendar into an UpdatePanel, it can reduce the appearance of postbacks by using callbacks. But it still makes a trip to the server for each click on a date or month.
in my application i have the playvideo page where video will play, below that i have the option for sharing the video like adding to favorite ,playlist and sending mail.
when i click on any of the link the page is postbacking and video will start from the first.
i place update panel for link button even though it is not working (video is playing from the first i.e., page is postbacking. can u help me. thank you
Actually, the part of page that is within the UpdatePanel does the postback. Make sure you have only those controls(for instance, your links) inside the UpdatePanel.
Alternatively, you can use multiple UpdatePanels; for instance one for your video and one for the links. In this case note that, when one UpdatePanel gets updated other UpdatePanels also gets updated, which you may not want; so all you have to do then is to mark the UpdateMode property to Conditional and call YourDesiredUpdatePanel.Update() method manually - whenever required.
Btw, updating selected portions of the page also reduces the load on the server
Or you may want to look into using client callbacks instead of a postback. But since client callback uses XMLHTTP, which means Microsoft implementation of AJAX, therefore callbacks are just awesome as long as your are working with IE.
You might want to try taking advantage of Page Methods to do the work you need done server side.
http://encosia.com/2008/05/29/using-jquery-to-directly-call-aspnet-ajax-page-methods/
Also, if you want to prevent a control from posting back, you can add return false to the end of your javascript onclick event on the control.
For example, if you had an asp button you were using you could do this:
<asp:Button ID="myButton" runat="server" OnClientClick="DoThingsInJavascript(); return false;" />
Or if you were just using a standard button you could say:
<input type="button" onclick="DoThingsInJavascript(); return false;" />
I've never really liked the update panel and I have sometimes found it's behaviour awful. Have you thought of trying something like a proper ajax call from Javascript
The __doPostBack is not working in firefox 3 (have not checked 2). Everything is working great in IE 6&7 and it even works in Chrome??
It's a simple asp:LinkButton with an OnClick event
<asp:LinkButton ID="DeleteAllPicturesLinkButton" Enabled="False" OnClientClick="javascript:return confirm('Are you sure you want to delete all pictures? \n This action cannot be undone.');" OnClick="DeletePictureLinkButton_Click" CommandName="DeleteAll" CssClass="button" runat="server">
The javascript confirm is firing so I know the javascript is working, it's specirically the __doPostBack event. There is a lot more going on on the page, just didn't know if it's work it to post the entire page.
I enable the control on the page load event.
Any ideas?
I hope this is the correct way to do this, but I found the answer. I figured I'd put it up here rather then in a stackoverflow "answer"
Seems it had something to do with nesting ajax toolkit UpdatePanel. When I removed the top level panel it was fixed.
Hope this helps if anyone else has the same problem. I still don't know what specifically was causing the problem, but that was the solution for me.
Check your User Agent string. This same thing happened to me one time and I realized it was because I was testing out some pages as "googlebot". The JavaScript that is generated depends on knowing what the user agent is.
From http://support.mozilla.com/tiki-view_forum_thread.php?locale=tr&comments_parentId=160492&forumId=1:
To reset your user agent string type about:config into the location bar and press enter. This brings up a list of preferences. Enter general.useragent into the filter box, this should show a few preferences (probably 4 of them). If any have the status user set, right-click on the preference and choose Reset
I had this same problem (__doPostBack not working) in Firefox- caused a solid hour of wasted time. The problem turned out to be the HTML. If you use HTML like this:
<input type="button" id="yourButton" onclick="doSomethingThenPostBack();" value="Post" />
Where "doSomethingThenPostBack" is just a JavaScript method that calls __doPostBack, the form will not post in Firefox. It will PostBack in IE and Chrome. To solve the problem, make sure your HTML is:
<input type="submit" id="yourButton" ...
The key is the type attribute. It must be "submit" in Firefox for __doPostBack to work. Other browsers don't seem to care. Hope this helps anyone else who hits this problem.
this might seem elemental, but did you verify that your firefox settings aren't set to interfere with the postback? Sometimes I encounter similar problems due to a odd browser configuration I had from a debugging session.
Is it because you are doing return confirm? seems like the return statement should prevent the rest of the code from firing. i would think an if statement would work
if (!confirm(...)) { return false; } _doPostBack(...);
Can you post all the js code in the OnClick of the link?
EDIT: aha, forgot that link button emits code like this
<a href="javascript:__doPostBack()" onclick="return confirm()" />
Are you handling the PageLoad event? If so, try the following
if (!isPostBack)
{
//do something
}
else if (Request.Form["__EVENTTARGET"].ToLower().IndexOf("myevent") >= 0)
{
//call appropriate function.
}
Check if you are getting a call this way, if so then maybe the event is not wired and nedes to be explicitly called.
what do you expect from "Enabled = 'false'" ?
I have had problems with firebug on some web forms, something to do with the network analyser can screw with postbacks.
With or without the OnClientClick event it still doesn't work.
The _doPostBack event is the auto generated javascript that .NET produces.
function __doPostBack(eventTarget, eventArgument) {
if (!theForm.onsubmit || (theForm.onsubmit() != false)) {
theForm.__EVENTTARGET.value = eventTarget;
theForm.__EVENTARGUMENT.value = eventArgument;
theForm.submit();
}
}
*The &95; are underscores, seems to be a problem with the stackoverflow code block format.
Now that i think about it, as noted in my last edit, you want to drop the javascript: in the on client click property. It's not needed, because the onclick event is javascript as it is. try that, see if that works.
Seems it had something to do with nesting ajax toolkit UpdatePanel. When I removed the top level panel it was fixed.
Hope this helps if anyone else has the same problem.
I had this exact same issue in a web app I was working on, and I tried solving it for hours.
Eventually, I did a NEW webform, dropped a linkbutton in it, and it worked perfectly!
I then noticed the following issue:
...
I switch the order to the following, and it immediately was fixed:
...
IE had no issue either way (that I noticed anyway).
I had a similar issue. It turned out that Akamai was modifying the user-agent string because an setting was being applied that was not needed.
This meant that some .NET controls did not render __doPostBack code properly. This issue has been blogged here.
#Terrapin: you got this exactly right (for me, anyways).
I was running User Agent Switcher and had inadvertently left the Googlebot 2.1 agent selected.
In Reporting Services 2008 it was causing the iframes that reports are actually rendered in to be about 300x200 px, and in Reporting Services 2008 R2 is was throwing "__doPostBack undefined" errors in the Error Console.
Switching back to the Default User Agent fixed all my issues.
I had the same problem with Firefox. Instead of using __doPostBack() could you use the jQuery .trigger() method to trigger a click action on an element that has your postback event registered as the click action?
For example, if you had this element in your aspx page:
<asp:Button runat="server" ID="btnMyPostback" OnClick="btnMyPostback_Click" CssClass="hide" ToolTip="Click here to submit this transaction." />
And your postback event in your controller:
protected void btnMyPostback_Click(object sender, EventArgs e)
{
//do my postback stuff
}
You could do the postback by calling:
$("#btnMyPostback").trigger("click");
This will cause the Page_Load event to fire if you need to do something on Page_Load.