I'm trying to wire up a CheckBox to handle an event when check/unchecked. If the user has JavaScript enabled, use that, otherwise use a postback.
Here is my code:
<asp:CheckBox ID="ApplicationInProcessCheckBox" runat="server"
Text="Application In Process" AutoPostBack="true"
oncheckedchanged="ApplicationInProcessCheckBox_CheckedChanged"
onclick="return false;" />
The return false in the javascript onclick event is disabling the postback. However, it also won't let the box check or uncheck. (I have more code to add to the javascript event... I just want to get the concept working first).
What am I doing wrong?
I think we can't post back on clicking checkbox without Javascript enabled.
Related
I'm trying to disable an asp button when it is clicked on the client side.
<asp:Button runat="server" ID="btnSubmit" Text="Save" class="Button" OnClick="btnSubmit_Click" CausesValidation="false"></asp:Button>
<script type="text/javascript">
$("input[type=submit],button").click(function (){$(this).attr("disabled", "disabled");});
</script>
when the button is clicked it does post back to the page_load , but it won't go to the btnSubmit_Click method. If I remove the jquery that disables the button it makes it from the page_load to the btnSubmit_Click method.
It seems when the button is disabled from the jquery it is no longer able to wire up to its event. Anyone have any ideas how I can disable the button client side, and still make it to the specific onclick event method?
This is resolved (Yuriy answered), the issue was that I needed to put the disabled code within the form.submit client side code. If not the disabled button was not firing its click event, yet it was still posting back, just not going to the onclick method.
solution:
$('#Form1').submit(function(){ $("input[type=submit],button").click(function (){$(this).attr("disabled", "disabled");});
I have the following code in my aspx file:
<button type="button" id="btnAskQuestion" runat="server" onserverclick="btnAskQuestion_Click">Ask Question</button>
I've tried every combination of onclick="return false;" and onclick="preventDefault()" I can think of, including putting them in the javascript function that gets called. Everything I try has one of two results: either I get a postback, or the server side code (btnAskQuestion_Click) never executes.
Any idea what I might be doing wrong?
You cannot execute server-side code this way, using onserverclick causes postback.
If you wish to prevent full page refresh and still execute server-side code, you have to call a client-side JS function via onclick and execute an AJAX call from there.
Another alternative is to use your button as a trigger for UpdatePanel - this way only partial postback will be performed.
Try using the property UseSubmitBehavior="false" in the button markup.
or you can use a "trick" :
Markup
<button onclick="myFunction()">Click Me!</button>
<div style="display:none">
<asp:Button runat="server" id="btnButton" .../>
</div>
js
function myFunction()
{
if (true statement)
$("[id$=btnButton]").click();
else
alert("false");
}
What this does is that you handle stuff with normal markup and do the logic using js. And you can trigger a click of the button that do something in the server.
There're OnClick, that fires on server and OnClientClick that fires on client browser. You should do this:
<asp:Button ID="btnAskQuestion" runat="server"
OnClick="btnAskQuestion_Click"
OnClientClick="return myfunction();">Ask Question</asp:button>
If myFunction returns true, then you will have a postback to the server.
My answer is appropriate only for ASP:Button, not the button control you are working with. Given the choice, I'd switch to ASP:Button.
You're looking for OnClientClick. If you put your JavaScript code there, it will kill the PostBack before it can hit the server.
On the other hand, if you're looking to execute server code without a PostBack, that's impossible. The PostBack is what triggers the server to act.
I have a form that currently uses an control to submit a form. Everything works perfectly. So now the new requirement is for the "submit' button to be a link. Changing it to a LinkButton control, without changing a SINGLE other thing, breaks the validation.
There is a bit too much code to post in a SO question and I know there's a bit of a lack of detail here, but is there any reason why a LinkButton wouldn't fire ASP.NET validation the same way a Button control would? In theory, they should both operate exactly the same, no?
The current submit button:
<asp:Button ID="btnSubmit" TabIndex="9" Text="Send" ValidationGroup="Forward" runat="server" />
The new submit button:
<asp:LinkButton ID="btnSubmit" TabIndex="9" Text="Send" ValidationGroup="Forward" runat="server" />
The Link button should fires the validation the same way a normal button does, my concerns in your case would be the following:
make sure these is nothing in the server side code stopping this.
make sure in the javascript code there is nothing stopping the "
ASP.NET controls that fire validation has a property called CauseValidation
Be sure all controls should fire validation, has this property set to True
Add attribute CauseValidation="True" to your control but if you want to fire this at particular line at code behind you can use validate the form by the following code:
FormID.Validate();
I know this is old but it has never answered. Did your validator have a "controlTovalidate"? Currently it would appear as if the validator was not firing but in reality it is. It just does not have anything that it is 'watching'. Hope if anyone reaches this thread that this helps even if it is just a little bit.
I was unable to determine the cause of this issue but was able to solve it:
I set the CausesValidation="false" and added at the top of the onclick event this.Validate(linkButton.ValidationGroup) this allows the event to get to the code behind and validation to occur.
I have some validation JS code on client, that must be executed befor PostBack.
If this validation code return 'false', postback is needless.
How it can be disabled?
Remember that the real validation should always happen on the server. Anything you do client-side is merely an optimization to save a few http round trips.
The easiest way to keep your client side and server-side validation in sync with ASP.Net is to use the validation controls. The validation controls will do both client side and server side validation, in such a way that if validation fails on the client it never posts to the server.
If you want to do something that's not covered by the standard validation controls, you should either use a CustomValidator or inherit your own control from BaseValidator.
Set the OnClientClick='YourJSValidationFunction' on your ASP button.
Then have the YourJSValidationFunction return true or false.
False will prevent postback
Example:
http://vijaymodi.wordpress.com/2007/06/08/button-onclick-and-onclientclick-2/
If the postback is being triggered by a button then you can do something like this:
<asp:Button ID="Button1" runat="server" Text="Button" OnClientClick="return IsValid();" />
If the IsValid function returns false then the postback will be prevented.
If you want to catch all postbacks regardless of which control triggers it then you can use <form id="form1" runat="server" onsubmit="return IsValid();">
What do you use: some validator or some button with onclick event?
If you have
<input type="button" id="btnID" runat="server" onclick="CheckValid();"/>
function CheckValid()
{
if(!IsValid) return false;//then no post back occer
}
Depending on the validation you're attempting, you may also be able to use the CustomValidator control. This would also allow you to easily implement your validation logic on the server side.
I have a ASP.NET Website, where, in a GridView item template, automatically populated by a LinqDataSource, there is a LinkButton defined as follows:
<asp:LinkButton ID="RemoveLinkButton" runat="server" CommandName="Remove"
CommandArgument='<%# DataBinder.GetPropertyValue(GetDataItem(), "Id")%>'
OnCommand="removeVeto_OnClick"
OnClientClick='return confirm("Are you sure?");'
Text="Remove Entry" />
This works fine. Whenever the Button is Clicked, a confirmation dialog is displayed.
What I am trying to do now, is to allow the user to enter a reason for the removal, and pass this on the the OnClick event handler. How would I do this?
I tried OnClientClick='return prompt("Enter your reason!");', but, of course, that did not work =)
Personally, I would stash the reason into a hidden field.
It would work something along these lines: your OnClientClick method would take the return value of a JS method, which does the prompt, and then places the result of the prompt into the hidden field.
You can also look into calling __doPostBack from your client-side code instead of using the OnClick postback. Then you can capture the reason and pass it server-side.