Unable to make ASP.NET control button fade out with JQuery - javascript

I have a simple enough problem: I have an ASP.NET control button and I want to make it fade out and then call some function (such as an alert) using JQuery. Here is what I have so far:
ASP Code for the Button:
<div id="begin">
<span id="startButtonSpan">
<asp:Button ID="startButton" class="startButton" runat="server" Text="Click Me!" OnClientClick="startButtonClick()"/>
</span>
</div>
JavaScript:
function startButtonClick()
{
$("#startButtonSpan > input").fadeOut(500, callAlert());
}
function callAlert()
{
alert("Made it here...");
}
When I click the button, the alert displays but the page does not even seem to try to perform the fadeOut. When I close the alert, the button is still there, staring at me.
Can anyone see any mistakes or does anyone have any suggestions on how I might be able to achieve the intended goal of fading out my button? Fadeout is really just my way of testing whether I can manipulate ASP controls using jQuery, so more than just the simple fadeOut, this is me trying to learn how to do that.
I tried a slightly more simple jQuery call using the code below, but it does not seem to work either:
ASP Portion:
<div id="begin">
<span id="startButtonSpan">
<asp:Button ID="startButton" class="startButton" runat="server" Text="Click Me!" OnClientClick="startButtonClick()"/>
</span>
</div>
<div id="jQueryTest" style="display:none;">
Block for testing jQuery.
<h1 id="testMessage">Child element for the ASP div.</h1>
</div>
Javascript Portion:
function startButtonClick()
{
$("#jQueryTest").css("display", "block");
$("#jQueryTest").show();
}
For this example, the text does display, but it immediately disappears again.
Any help or suggestions as to what I might be doing wrong would be greatly appreciated.

Use the class as a selector $('.startButton') instead of the ID since ASP.Net controls change their IDs dynamically when rendered by appending its Page & Control information.
$(".startButton").fadeOut(500, callAlert);
Or, if you're adamant about using the ID, here is another way to handling the selector,
$("#<%=startButton.ClientID %>")
Or, as Jacob suggested in his answer, you could ClientIDMode="Static", but this works only if your application is .Net 4.0 or above.
Also, use CssClass instead of class
<asp:Button ID="startButton" Csslass="startButton" runat="server" Text="Click Me!" />

The first example has 2 problems.
1. You should write
$("#startButton").fadeOut(500, callAlert);
and not
$("#startButton").fadeOut(500, callAlert());
2. For ASP.NET you must set ClientIDMode="Static" ortherwise asp.net will alter your id.
<asp:Button ID="startButton" ClientIDMode="Static" ... OnClientClick="startButtonClick()"/>

How about the fact that your code is fine (although other answers here should be considered) but your button is making a post back to the server and simply your browser does not have enough time to render the fade effect.
To test this, add a return false; to the OnClientClick property. This will of course cancel your action on the server but you will obtain the fade effect:
<asp: Button ... OnClientClick="startButtonClick();return false;"></asp:Button>
To work around this and still submit your request, you can try to use the ASP.NET __doPostBack method in JavaScript
ASP.NET:
<asp:Button ID="startButton" class="startButton" runat="server" Text="Click Me!" OnClientClick="startButtonClick(this);return false;"/>
JavaScript:
function startButtonClick(button)
{
$("#startButtonSpan > input").fadeOut(500, function(){__doPostBack(button.name, "")});
}
The __doPostBack method takes two arguments: the name of the control that is doing the postback and a postback argument that can be use to send more info on the server. In the case of the asp:Button, the name of the button should be sufficient to send the request without a problem.
Using this technique you will fade the button on the client and also trigger the action on the server. I cannot guarantee that this exact code will work (I don't have access to a dev environment right now) but you should get the idea.

If I could, I would like to provide another answer for those that use MasterPages and find that you can't always use $("#<%= SomeContentControl.ClientID %>") when working with Content controls.
What I do is set the MasterPage ID in my Init() like this:
protected void Page_Init( object sender, EventArgs e )
{
// this must be done in Page_Init or the controls
// will still use "ctl00_xxx", instead of "Mstr_xxx"
this.ID = "Mstr";
}
Then, you can do something like this with your jQuery:
var masterId = "Mstr",
$startButton = getContentControl("startButton"),
$message = $("#jQueryTest");
function getContentControl( ctrlId )
{
return $("#" + masterId + "_" + ctrlId);
}
function hideStartButton()
{
$startButton
.stop(true, true)
.fadeOut("slow", showMessage);
}
function showMessage()
{
$message
.stop(true, true)
.fadeIn("slow");
}
$startButton.on("click", hideStartButton);
Here is a jsFiddle that has the Mstr_ prefix already inserted as if ASP.NET rendered it.

Related

<asp:Button> event not firing when within element affected by jQuery

I am creating an ASP.NET with C# calendar application. When a user clicks on a day, I am using a jQuery Popup Overlay which will allow the user to add an 'appointment' and click a button to process the entered information in the codebehind.
The Popup overlay basically hides an HTML element and makes it visible when another element is clicked (great examples by following link above).
The Code:
<asp:Button ID="ButtonA" runat="server" OnClick="Button_Click" Text="Button A" />
<asp:Label ID="Label" runat="server" Text="Foo"></asp:Label>
<div id='slide'>
<div id="content">
Content of the 'popup panel'
<asp:Button ID="ButtonB" runat="server" OnClick="Button_Click" Text="Button B" />
</div>
</div>
CodeBehind:
public void Button_Click(Object sender, EventArgs e)
{
Label.Text = "Bar";
}
Javascript:
$(document).ready(function () {
$('#slide').popup({
//options
});
});
I tried adding the AutoPostBack="true" parameter to the buttons, but it doesn't make a difference (should be automatic regardless, correct?). I also tried adding the runat="server" parameter to the div elements, but that made the issue worse.
I am afraid that I don't understand the nature of the issue enough to provide more information than this - Sorry!
It's likely that the jQuery plugin is overriding the behaviour of the button. You could use the onclose callback from the URL you provided to have a function like so:
function() {
__doPostBack("ctl00$MainContent$ButtonB","");
}
Failing that, you could have another button outside the popup div which you do a click() event on manually during the onclose event of the popup, but that seems like a bit of a hack!

Calling button click from JavaScript asp.net doesn't work

I am trying to invoke a server side method through JavaScript by first displaying a confirm message and then trigger a button click on the page to call the function. However, the .click() method doesn't seem to work. Any ideas?
<script type="text/javascript">
function confirmDelete() {
var button = document.getElementById("hiddenButton");
if (confirm("Are you sure you would like to delete the row")) {
button.click();
}
}
</script>
and the button is defined like follows
<asp:Button ID="hiddenButton" runat="server" onclick="showHiddenMessage" Text="hidden" width="100px" />
Everything that I have found suggest that it should. including here:
http://www.comptechdoc.org/independent/web/cgi/javamanual/javabutton.html
and here:
Call ASP.NET function from JavaScript?
var button = document.getElementById('<% =hiddenButton.ClientID %>');
Id of server side controls is different on client side. modify code as above and try.
Modify confirmDelete() method as below:
function confirmDelete() {
if (confirm("Are you sure you would like to delete the row")) {
__doPostBack(( 'hiddenButton', '' );
}
}
Take a look at the ClientIDMode property of a Button. Setting this to Static will cause the button to render with the ID you entered in to your ASP.NET code. https://msdn.microsoft.com/en-us/library/system.web.ui.control.clientidmode.aspx
<asp:Button ID="hiddenButton" runat="server" ClientIDMode="Static" onclick="showHiddenMessage" Text="hidden" width="100px" />
If you look at the generated HTML, you should see the ID of this button as hiddenButton which should allow your Javascript to work.
By default ClientIDMode value will be Inherit, and will include the NamingContainer within the ID. This means the ID of the rendered HTML will be something like Panel1_hiddenButton and your Javascript won't find it with the current code.
For reference:
Static - The ClientID value is set to the value of the ID property. If the control is a naming container, the control is used as the top of the hierarchy of naming containers for any controls that it contains.
Inherit - The control inherits the ClientIDMode setting of its NamingContainer control.
But why don't you use your javascript function with your button? I think it is better:
<script type="text/javascript">
function confirmDelete() {
if (confirm("Are you sure you would like to delete the row?")) {
return true;
}
return false;
}
And your button:
<asp:Button ID="hiddenButton" runat="server" OnClientClick="return confirmDelete();" onclick="showHiddenMessage" Text="hidden" width="100px" />
In this case if user will click OK button, your showHiddenMessage function will occur. Otherwise nothing will be happen.

Trigger jQuery function / event from c# code-behind

I hope I will be able to explain my problem clearly.
Scenario:
Asp.net web page with UpdatePanel. Some properties of controls are changeable via UI trigger and are set in jQuery (for faster response, as this page is expected to accept input data of at least 500 records per day).
Example below, (if written in c# code, the logic is like this: txtIDNumber.Enabled = chkIsReceiptRequired.Checked; rfvIDNumber.Enabled = chkIsReceiptRequired.Checked;):
Markup:
<asp:CheckBox ID="chkReceiptRequired" runat="server" Text="Receipt required" />
<asp:TextBox runat="server" ID="txtIDNumber" Width="150px" style="float: left;" />
<asp:RequiredFieldValidator ID="rfvIDNumber" runat="server" ForeColor="Red"
ErrorMessage="Enter ID No." ControlToValidate="txtIDNumber" ValidationGroup="save" />
Snippet of default jQuery code (upon page load, chkReceiptRequired is unchecked, validator and textbox will only be enabled upon ticking chkReceiptRequired):
<script type="text/javascript">
function pageLoad(){
$('input[id$=_txtIDNumber]').prop('disabled', true);
ValidatorEnable($("[id$='rfvIDNumber']")[0], false);
$('input[id$=_chkReceiptRequired]').change(function () {
$('input[id$=_txtIDNumber]').prop('disabled', !$(this).is(':checked'));
$('input[id$=_txtIDNumber]').val(!$(this).is(':checked') ? '' : $('input[id$=_txtIDNumber]').val());
ValidatorEnable($("[id$='rfvIDNumber']")[0], $(this).is(':checked'));
});
}
</script>
I'm using this same page to load the data here to perform record update. Code snippet of data loading:
var maintableComponent = new MainTableComponent();
var maintableData = maintableComponent.GetMainTableDataById(rowId);
chkReceiptRequired.Checked = maintableData.IsReceiptRequired.Value;
txtIDNumber.Text = maintableData.IDNumber;
//todo: enable txtIDNumber and rfvIDNumber from here
The problem: by right, upon page render for update, because chkReceiptRequired is checked, supposedly txtIDNumber should be enabled. But my problem is, it is not. What can I do to enable the txtIDNumber and rfvIDNumber upon data loading from code-behind?
*I have already tried this link and this but it doesn't seem to work.
Please, please help me. The snippets I posted here are just one of many jQuery validations that I desperately need to address. Thanks in advance.
Feeling incredibly stupid right now. Figured out how to fix it after sleeping it off. :P
I just changed the default jQuery code to this:
var isReceiptRequired = $('input[id$=_chkReceiptRequired]').is(':checked');
$('input[id$=_txtIDNumber]').prop('disabled', !isReceiptRequired);
ValidatorEnable($("[id$='rfvIDNumber']")[0], isReceiptRequired);
I just remembered that the last thing in the page-cycle is rendering it on the page so the jQuery can be manipulated by the values set in the control from code-behind.

do a postback with javascript to a certain Page Method

What I'm doing now is this:
<div style="display:none;">
<asp:Button runat='server' OnClick='OnDoClick' ID="b1" />
<asp:HiddenField runat='server' ID="SecretValue" />
</div>
function doPostb(value)
{
$('#SecretValue').val(value);
$('#<%=b1.ClientID%>').click();
}
so basically I need to post to a page method and send some value to it
anybody knows a more straightforward way of doing this ?
Straightforward? Wrap your div in a form tag and do:
$("#your_new_form").submit()
If you want to do it without the page re-loading, you could try jQuery's post function.
If you want to do it without the page re-loading, you could try jQuery's submit function, which would behave the same as the click of a submit button, but might be more semantically appropriate.
You might also want to look at asp.net's doPostBack function.
You can use __doPostBack method of asp.net Client-library.
function doPostb(value)
{
$('#SecretValue').val(value);
__doPostBack('<%=b1.UniqueD%>','');
}
I can't get that why you mentioned about PageMethods ??

href link to trigger asp.net c# button event

I have a navigation bar consisting of list items. Right at the end of the nav bar I want a logout link:
//other links
...
<li>
logout
</li>
I have an event in my C# code called Logout_Click(object sender, EventArgs e) that I want to run when the user clicks the above navbar link, but obviously ordinary <a> tags don't trigger ASP.NET click events.
So I thought I'd be clever and create a HIDDEN <asp:Button> called logout that does trigger the Logout_Click function, and then get the JavaScript to click the button for me.. here is my code:
Log Out
<form runat="server">
<asp:Button ID="logout" runat="server" onclick="Logout_Click" Visible="false" />
</form>
But it still didn't work.
Can someone help me?
Try:
Log Out
Can you try without the Visible="false" on the asp:button?
And if it works hide it with css instead, style="display:none;"
I think the script needs the client side id of your asp.net control:
javascript:document.getElementById('<%=logout.ClientID').click()
Or you can use the __doPostBack function ...
http://wiki.asp.net/page.aspx/1082/dopostback-function/enter link description here
Why not you are using Asp.net LinkButton ?
It's easy to do this work with LinkButton.

Categories