I use yui datatable in my asp.net application... I have a link button in one of my columns and it works fine but doesn't do a postback of a hidden button...
myDataTable.subscribe("linkClickEvent", function(oArgs) {
javascript: __doPostBack('ctl00_ContentPlaceHolder1_Button1', '');
YAHOO.util.Event.stopEvent(oArgs.event);
});
and in my page
<asp:Button ID="Button1" runat="server" onclick="Button1_Click" Text="Button"
style="display:none;" />
protected void Button1_Click(object sender, EventArgs e)
{
DownloadFile(Hfhref.Value, true);
}
I used break point but it doesn't seem to get the __dopostback.. Any suggestion...
add unique id on __doPostBackMethod from Button.
I just did this and it worked,
document.getElementById("ctl00_ContentPlaceHolder1_Button1").click();
just call click() my button it worked...
I want to know whether it works in all browsers...
If you're using ASP.Net 4.0 framework, add ClientIDMode="Static" to your control declaration and you can call __doPostBack('Button1',''); directly.
<asp:Button ID="Button1" runat="server" onclick="Button1_Click" Text="Button"
style="display:none;" ClientIDMode="Static" />
The ClientIDMode attribute is new to 4.0 and allows you the option of having a known unique id for controls. Calling postback for the control will run whatever postback method is defined in the control's OnClick attribute.
In your markup, make sure to properly case the OnClick handler.
onclick="Button1_Click"
should be
OnClick="Button1_Click"
The way you have written it, onclick will be interpreted as an attribute of the control and onclick="Button1_Click" will be rendered to the browser, instead of being handled on the server side.
Related
In ASP.NET when using validation controls (i.e. RequiredFieldValidator) the client sided framework will execute the JS function Page_ClientValidate. This function will validate all controls on the page (of the given ValidationGroup) and call the JS function ValidatorUpdateDisplay with a parameter of the DOM element of the span tag of the validator control.
ValidatorUpdateDisplay toggles the visibility of the span tag depending on the result of the validation.
In my web application I've overridden the ValidatorUpdateDisplay JS function to provide more functionality on the validation scenario (i.e. red borders around the controls, showing popover on the first failed control and scrolling to it).
Now this works very well until my controls (incl. submit button) are shown the first time after a postback in an UpdatePanel.
<asp:ScriptManager runat="server" />
<asp:UpdatePanel ID="upTest" runat="server" UpdateMode="Conditional">
<ContentTemplate>
<asp:Button ID="bShow" runat="server" UseSubmitBehavior="false" Text="SHOW" OnClick="bShow_Click" />
<asp:Panel ID="pContent" runat="server" Visible="false">
<asp:TextBox ID="tbTest" runat="server" />
<asp:RequiredFieldValidator ID="rfvTest" runat="server" ControlToValidate="tbTest" Text="Not valid" />
<asp:Button ID="bTest" runat="server" UseSubmitBehavior="false" Text="TEST" />
</asp:Panel>
</ContentTemplate>
</asp:UpdatePanel>
<script type="text/javascript">
function ValidatorUpdateDisplay(val) {
debugger; // this will not be reached
}
</script>
protected void bShow_Click(object sender, EventArgs e)
{
this.pContent.Visible = true;
}
After initial load press bShow to display pContent.
Now, if you leave tbTest.Text empty and press on bTest it should enter the overridden ValidatorUpdateDisplay function, however it enters the function of the framework and displays "Not valid" from rfvTest.
If you change pContent.Visible to true and press bTest after initial load the desired effect will happen: It will enter the custom ValidatorUpdateDisplay function and not display "Not valid".
If you move the button bTest out of the UpdatePanel the problem persists.
How can I make it work inside an UpdatePanel?
ASP.NET uses a lazy loading approach to insert the ValidatorUpdateDisplay function when it needs it the first time, hence in my example it will load the function after the postback of the UpdatePanel.
This will override my own implementation of the ValidatorUpdateDisplay function, because it's inserting the function at the end of the page.
There is a dirty workaround, I just inserted an empty CustomValidator on initial load that is always valid:
<asp:CustomValidator runat="server" />
I wish there was a cleaner solution.
I try to make postpackurl in code behind so that I can send the code but my issue is when I click the button its keep it in the same page .
my question is how I can make the postbackurl directly go to next page?
Asp.net Button Has property named postbackurl which you can set postbackurl:
<asp:button id="Button2"
text="Post value to another page"
postbackurl="Button.PostBackUrlPage2cs.aspx"
runat="Server">
</asp:button>
Use
response.redirect("frmdefault.aspx")
in your button click code.
In the ASPX file add the below Script:-
<script type="text/javascript">
function SomeMethod() {
window.location.reload("nextpage.aspx");
return false;
}
</script>
<asp:Button ID="Button1" runat="server" Text="Button" OnClientClick="return SomeMethod();"/>
When the user clicks on the button1 the nextpage.aspx page will be executed and no postback will happen on the current page
How to disable button callback, I want to use this button on client side only?
<dx:ASPxButton ID="btn_clear" runat="server"
Text="Clear" Width="90px" OnClick="btn_clear_Click">
<ClientSideEvents Click = "OnClick" />
</dx:ASPxButton>
onClientClick=return false will prevent processing the normal postback. If you want to do some custome javascript at client side, you can call return false after that
<asp:Button id="btn1" runat="server" onClientClick="return MyFunction" />
And in javascript
function MyFunction()
{
//Do your custom code
return false;
}
Judging by your button tag prefix it looks as though you're using Devexpress components not a normal asp.net button. Devexpress' ASPxButton control client click event has a processOnServer property which you can set to false to prevent a postback:
<dx:ASPxButton ID="btn_clear" runat="server"
Text="Clear" Width="90px" OnClick="btn_clear_Click">
<ClientSideEvents Click = "OnClick" />
</dx:ASPxButton>
and your OnClick() javascript function:
function OnClick(s, e)
{
e.processOnServer = false;
}
Without using third party components, if you want a button to just do something client side, then just use a HTML input button but if you want to have the client side capabilities of the asp.net button at your disposal (such as causing validation) then Shyju's answer is the way to go.
Hwo about simply removing the OnClick Handler ?
<dx:ASPxButton ID="btn_clear" runat="server"
Text="Clear" Width="90px">
<ClientSideEvents Click = "OnClick" />
</dx:ASPxButton>
Or even better, just use a HTML button in the first place (<input type="button" />).
You can't.
Server side controls must run on the server side.
If you omit the runat="server" attribute, the markup will render exactly like this:
<dx:ASPxButton ID="btn_clear"
Text="Clear" Width="90px" OnClick="btn_clear_Click">
<ClientSideEvents Click = "OnClick" />
</dx:ASPxButton>
This will be completely ignored by the browser, as an element dx:ASPxButton is not a valid HTML element.
Just add an attribute AutoPostBack="false", this will stop the postback, still you need to call server side function using client side script, you can use callback panels
I am creating a ModalPopupExtender inside a Web User Control.
When i click on the OK Button in the panel, which is showing as model popup, the Event Handeler of the button is not executing.
This problen does not occure when i do not use the Web User Control.
Here is the user control (.ascx) file code.
<script type="text/javascript" language="javascript">
function OkClicked(sender, e) {
__doPostBack('Button1', e);
}
</script>
<asp:Button ID="Button2" runat="server" Text="Show" />
<asp:Panel ID="Panel1" runat="server">
<asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>
<asp:Button ID="Button1" runat="server" Text="Button" onclick="Button1_Click" />
</asp:Panel>
<asp:ModalPopupExtender ID="ModalPopupExtender1" runat="server"
DropShadow="True" OkControlID="Button1" PopupControlID="Panel1"
TargetControlID="Button2" onokscript="OkClicked()">
</asp:ModalPopupExtender>
<p>
<asp:Label ID="Label1" runat="server" Text="Label"></asp:Label>
</p>
And the Event Handeler for the click event of the 'Button1' is
protected void Button1_Click(object sender, EventArgs e)
{
Label1.Text = TextBox1.Text;
}
In the javascript you shouldn't put 'Button1' as the name of the control. Instead, on the PreRender event of your control, fill that out with this.Button1.ClientID .
ClientID is the unique identifier across the entire generated page of your button control, allowing the server to pinpoint exactly what control triggered the postback.
If this wasn't like that, you wouldn't be able to place multiple instances of a same control on one page.
In code:
<script type="text/javascript" language="javascript">
function OkClicked(sender, e) {
__doPostBack('<%= this.Button1.ClientID %>', e);
}
Couple of suggestions:
Do you have any kind of validation on this page. If so, then it's possible that when you click the ok button, that validation is failing. When you click the button, likely the ModalPopup Extender will close, and if validation fails it may cancel the event happening. If this is the case, add an attribute: CausesValidation="false"
If that doesn't work, you may add an attribute to MAKE it post back, I believe there's an attribute -> AutoPostBack="true".
#Joachim is correct that you'll need to use the clientID, but at the same time, I don't think you'll need to call javascript to run the backend code.
Also, you may consider putting this into an UpdatePanel so that you do an AJAX postback without sending the entire page back and forth when the page is posted back.
I'm trying to use the ImageButton control for client-side script execution only. I can specify the client-side script to execute using the OnClientClick property, but how do I stop it from trying to post every time the user clicks it? There is no reason to post when this button is clicked. I've set CausesValidation to False, but this doesn't stop it from posting.
I know this problem has already been answered but a simple solution is to return false from the HTML onclick method (i.e. the ASPX OnClientClick method) e.g.
<asp:ImageButton ID="ImageNewLink" runat="server"
ImageUrl="~/images/Link.gif" OnClientClick="DoYourStuff(); return false;" />
Returning false stops the browser from making the request back to the server i.s. stops the .NET postback.
Here's one way you could do it without conflicting with the postback functioning of other controls:
Define your button something like this:
<asp:Button runat="server" Text="Button" UseSubmitBehavior="false" OnClientClick="alert('my client script here');my" />
The "my" ending in the handler for OnClientClick is a way to alias asp.net's __doPostBack client event that forces the postback; we simply override the behavior by doing nothing similar to this script:
<script type="text/javascript">
function my__doPostBack(eventTarget, eventArgument) {
//Just swallow the click without postback of the form
}
</script>
Edit: Yeesh, I feel like I need to take a shower after some of the dirty tricks that I need to pull in order to get asp.net to do what I want.
Another solution would be to define a PostBackUrl that does nothing
<asp:imagebutton runat="server" PostBackUrl="javascript:void(0);" .../>
<image src="..." onclick="DoYourThing();" />
Use a server side Image control
<asp:Image runat="server" .../>
Pretty sure you can add the client onclick event to that.
Solution 1
<asp:ImageButton ID="btn" runat="server" ImageUrl="~/images/yourimage.jpg"
OnClientClick="return false;" />
OR
Solution 2
<asp:ImageButton ID="btn" runat="server" ImageUrl="~/images/yourimage.jpg"
OnClientClick="yourmethod(); return false;" />
In addition (solution 2), your javascript method may be in this form
<script type="text/javascript">
function yourmethod() {
__doPostBack (__EVENTTARGET,__EVENTARGUMENT); //for example __doPostBack ('idValue',3);
}
</script>
in code behind
protected void Page_Load(object sender, System.EventArgs e)
{
if (this.IsPostBack) {
string eventTarget = this.Request("__EVENTTARGET") == null ? string.Empty : this.Request("__EVENTTARGET");
string eventArgument = this.Request("__EVENTARGUMENT") == null ? string.Empty : this.Request("__EVENTARGUMENT");
}
}
This works Great for me:
Use OnClientClick to write your script and PostBackUrl="javascript:void(0);" to avoid postback.
<div class="close_but">
<asp:ImageButton ID="imgbtnEChartZoomClose" runat="server" ImageUrl="images/close.png" OnClientClick="javascript:zoomclosepopup();" PostBackUrl="javascript:void(0);" />
</div>
Use OnClientClick to write your script and PostBackUrl="javascript:void(0);" to avoid postback