Javascript - C# - Enable Button Ontextchange Without Posting Back?
Mar 22, 2011
so i have a lightbox in which pops up an aspx page with textboxes and two buttons (submit - disabled and cancel - enabled). I wanted to enable my submit button ontextchange. it works fine when opened separately (not as a lightbox) but when i let it run normally with the lightbox function everytime ontextchange gets triggered the whole page refreshes disabling the lightbox.
<asp:TextBox ID="textBox1" runat="server" OnTextChanged="OnTextChanged_AttributesEdited" autopostback="true">
protected void OnTextChanged_AttributesEdited(object sender, EventArgs e)
{
btnSubmit.Enabled = true;
}
now if i take out the "autopostback=true" it then will not trigger the the ontextchanged. was wondering if is it better if javascript will be the way to go for enabling the button or is there a way where i can prevent the postback when ontextchanged is triggered?
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Similar Messages:
Mar 31, 2011
I basically want to show a dialog box with confirm or cancel options on it.
Confirm should allow the partial postback to take place, cancel should not. I have tried using a trigger and calling __doPostBack() as advised here but it posts back the full page not just the panel.
$('#buttonInUpdatePanel').live('click', function (event) {
event.preventDefault();
var item = this;
var title = 'Confirm';
var msg = 'Please confirm something';
var $dialog = $("<div id='myDialog'></div>")
.html(msg)
.dialog({
modal: true,
buttons: {
"Confirm": function () {
$(this).dialog("close");
__doPostBack('Button1', null); //tried this and .submit() on the button
//return true;
},
"Cancel": function () {
$(this).dialog("close");
//return false;
}
},
title: title
});
});
My UpdatePanel:
<asp:UpdatePanel ID="UpdatePanel2" UpdateMode="Conditional" runat="server">
<ContentTemplate>
<asp:TextBox runat="server" ID="TextBox1" />
<asp:Button
ID="Button1"
Text="Add"
OnClick="AddExtraVehicle_Click"
runat="server" />
</ContentTemplate>
<Triggers>
<asp:AsyncPostBackTrigger ControlID="Button1" EventName="Click" />
</Triggers>
</asp:UpdatePanel>
UPDATE:
I have changed the doPostBack to use the button ID now and commented out the return true and false lines. When I click the button it calls the confirmation dialog but when you click on confirm it appears to do nothing. I was expecting a call to the method AddExtraVehicle_Click but the breakpoint didn't trigger.
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Feb 25, 2011
I have a keyboard-controlled menu which I did with jquery (When I press down, it marks second option and so on...)
But after I select the option I need, I want to click enter to call the button's OnClick method as if the user really clicked it. Which means I have to do a postback.
how do I do that?
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Aug 10, 2010
I have an ASP dropdownlist with AutoPostBack="true" and I want to do some javascript client side which can stop the postback if necessary. However, I can't get it to stop the postback.
<script type="text/javascript">
$(document).ready(function()
{
$("#ddl").bind('change', function() {
return false;
});
});
</script>
<select id="ddl" onchange="form.submit()">
<option value="">Item 1</option>
<option value="">Item 2</option>
<option value="">Item 3</option>
<option value="">Item 4</option>
<option value="">Item 5</option>
</select>
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Aug 26, 2010
I have a control which inherits from LinkButton and I'm trying to make sure that the user cannot cause mayhem by performing multiple postbacks. That seemed an easy enough challenge, so I have this code [snippet] on the client:
[Code]....
The alert is of course only there for debugging. If the DisableOnClick value is false, then I see the "Posting Back" alert and, when I click ok, the postback occurs - all good.
If the DisableOnClick value is true, then the "button" gets disabled and the cursor turns into an hourglass - again good. But the postback doesn't happen - not good. I assume that the ASP client code is trying to preventing the postback when it sees that the link is disabled.
So, how can I either:
Persuade the LinkButton to postback even though it has just been disabled; or[probably better] Get my client code to execute immediately after the postback code rather than before.
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Apr 23, 2010
I have a simple user control with this code:
<%@ Control Language="C#" AutoEventWireup="true" CodeFile="Pager.ascx.cs" Inherits="Pager" %>
<table style="width: 100%;">
<tr>[code]....
As you can see, the 2 buttons are wired to click events, which are defined correctly in the code-behind.Now, here is how I include an instance of the control on my page:
<uc:Pager ID="Pager1" runat="server" TotalRecords="100" DisplayItemsPerPage="true"
ItemsPerPageChoices="10,25,50,100" ItemsPerPageFormatString="Sessions/Page: {0}"
PageSize="25" OnPageChanged="PageChanged" OnPageSizeChanged="PageChanged" />
I noticed though, that the 2 buttons in my user control weren't causing a post back when clicked. The drop down list does cause postback, though. Here is the rendered HTML:
<table style="width: 100%;">
<tr>
<td id="ctl00_MainContent_Pager1_PageControls" align="left">[code]....
And, as you can see, there is no onclick attribute being rendered in the button's input elements. Why not?
EDIT,Ronnie, why are you so dumb??? <input type="submit" /> doesn't use javascript to post a form!
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Oct 22, 2010
Right now, I have a text box:
<asp:TextBox ID="Slider1" runat="server" AutoPostBack="True" OnTextChanged="Slider1_TextChanged"></asp:TextBox>
I also have this javascript function.
function InsertLabelData() {
PageMethods.GetLabelText(onSuccess, onFailure);
}
function onSuccess(result) {
//var lbl = document.getElementById('Slider11_mA');
document.getElementById("Slider11_mA").value =result;
}
I want manual inputs (if a user enters text inside teh textbox) to cause a postback. The ontextchanged event will be raised. HOWEVER, when this javascript function is called, it too will also set a value to the textbox. So how can I tell javascript to somehow temporarily disable the ontextchanged so that when it sets its own value, it wont' fire the postback?
Subsequently, when a user DOES go back and change teh value in the textbox, it too must also fire again.
so basically:
1. user can change textbox value and will cause postback with ontextchange.
2. javascript can also change textbox value but must not raise ontextchanged event. but must preserve the ontextchange event for the user.
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Dec 31, 2010
I have a repeater that has a LinkButton in the Item Template. The LinkButton displays a UserControl that consists of a FormView. The UserControl has an HTML Element that when clicked hides the UserControl by simply change the display of the control from 'block' to 'none'. If the 'Close' span is clicked, the UserControl is successfully hidden, but afterward, the 'Edit' linkbuttons no longer postback.
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Apr 6, 2010
I'm trying to enable a button through javascript when a checkbox is checked. This works fine in one of my pages, but on one page the button and checkbox in within a ModalPopup window, and there it doesn't work. How can I work around this?
javascript: document.getElementById('<%=okBtn.ClientID%>').disabled = false;
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Feb 18, 2011
var elem = document.getElementById('<%=imageButton1.ClientID %>');
elem.setAttribute('enabled', 'true');
elem.setAttribute('enabled') = 'true';
Neither of them are working for me with Firefox.
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Jun 22, 2010
i have an AJAXIFIED button(btnsend) thas is disable by it's Property -> Enabled="False"
i have a TextBox Next To This Button And I Want Enable that Button When Users Type Something in That TextBox...
so i did this (JavaScript):
function onkeyupontextbox() {
var btnSend = document.getElementById("btnSend");
btnSend.disabled = false;
}
but that button does not work after becomes enable...
what can i do about that?
(i am using radajaxmanager for ajaxify that button) (when i remove that button from RadAjaxmanager Or UpdatePanel So EveryThing Is Ok , But I Want That Button In Ajaxify Mode)
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Jun 22, 2010
disable / enable An Ajaxifeid Button From Client Side (JavaScript)?
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Jan 18, 2010
I am trying to keep a button disabled unless a row in my gridview has been selected. If I just keep the button disabled, I cannot ever get it re-enabled.I am assuming I need some javascript to enable it when a row is selected.
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Sep 15, 2010
I have a gridview were one of the colunms has a checkbox for deleting that row. When the user open the page the delete button is set to enable = false. If the user checks one box the delete imagebutton is disable = false. That works, now I need to add Javascript to enable the Delete button if the user selects checkAll, how do I do that?
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Dec 21, 2010
I've got an asp.net page that uses dynamically populated DropDownLists and OnSelectedIndexChanged events. A few days ago I found a defect where hitting the back button would load the previous page from the browser's cache, so the DropDownList would already have a selected index (hence the OnSelectedIndexChanged event would not fire properly as it didn't have the default selected index). I understood the issue and googled around. It's a well known issue that doesn't have an easy solution because of how the browser interacts with the page. After a bit of thought, I went with a trivial javascript solution to reset the ddls:
var gvTable = document.getElementById("foo");
if (gvTable != null)
{
[code]...
This worked well and I was happy. Until I tested it in IE. In IE, it appears to run the script, THEN load the cached values of the DDL. That is, I observe the DDL snapping back to the 0 index, and then suddenly dropping down to the previously selected value. I'm sort of at a loss here, I typically debug in firebug, but this works perfectly in firefox and chrome.
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Aug 18, 2010
I have an ASP.NET page that contains two div's. Both have search fields and a search button contained within each of them. When I first come to this page, Div A has the class 'SearchDiv' while Div B has 'SearchDivDisabled'. These classes change the appearance so the user knows which search type they currently have enabled.
When Div B is clicked, JavaScript changes it's class to 'SearchDiv', and changes Div A to 'SearchDivDisabled'. This all works like a charm. The problem I have is when a user changes to Div B, clicks Div B's search button (which obviously redirects to a results page), and then uses the browser's back button. When they return to the search page, Div A is enabled again, and Div B is Disabled, even though they last used Div B. In the search button event handler I set the class attribute of the Divs before I redirect, hoping this will update the page on the server so when the user returns, their last-enabled Div will still be enabled (regardless of which one was enabled when the page was first visited).I believe this involves the ViewState, but I'm unsure why the class attribute is not saved so when the user returns to the page it is restored.
Edit: Here is the button event handler code:
protected void RedirectToResults(int searchEnum, string resultPage)
{
ShowContainer(searchEnum);[code]....
RedirectToResults() is called from the actual button event handler with the enum representing the selected search panel and the results page url. SearchContainers is a dictionary mapping an integer to the search Div. The important code is the last line, where I'm updating the selected search container with the 'active' search class, rather than the disabled one (which I assign to the other div(s) )
Additional Update: I have been battling with this issue for the last couple days. I was sort of able to get the following code to work (in page_load):
Response.AppendHeader("Cache-Control", "no-cache, no-store, must-revalidate"); // HTTP 1.1.
Response.AppendHeader("Pragma", "no-cache"); // HTTP 1.0.
Response.AppendHeader("Expires", "0"); // Proxies.
But this really isn't a solution, as everything else that gets cached correctly is lost, which leaves me worse off than when I started. Everything else seems to persist fine, it is just the class of the div that is causing me struggles.
Edit: Just wanted to update this for anyone else that comes across this. While I believe there is a solution here with setting the cacheability of the page to force the browser to postback, I could not get it working 100% with all browsers (primarily Firefox was giving me fits, which is a documented bug). I do believe the cookie solution would work, but I felt that may be a bit more complex than necessary for just trying to store the state of a couple div's.
What I ended up doing was tying the div's class to the state of it's correlating radio button (there are radio buttons next to the div which allow the users a more visual way of enabling search panels). I noticed these radio buttons retained the correct checked value when the back button was used, so I could guarantee they would indicate the correct div to be enabled. So in JavaScript's onload I check which radio button is enabled, and then adjust the classes of the search div's accordingly. This is a pretty big hack, but has worked 100% across all browsers, and only took about 10 lines of JavaScript.
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Jun 2, 2010
I have created a listbox that the selected items would remove by using javascript once I clicked on a server button. Below is the code I'm using
<asp:button id="btnSelected" Runat="server" CssClass="InputFormObject" Text=">" ></asp:button>
<script language="javascript">
function removeOptions(selectbox)
{
var i;
for(i=selectbox.options.length-1;i>=0;i--)
{
if(selectbox.options[i].selected)
selectbox.remove(i);
}
return false;
}
</script>
private void Page_Load(object sender, System.EventArgs e).......................
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Apr 22, 2010
Im using asp.net c# (webforms) I want to add a back button to my page. (you land on this page if you incorrectly fill in a form). if javascript is enabled i want to go back via javascript, but if it is disabled i'll just do a response.redirect("~/home.aspx"). how can i implement this? is it 2 buttons? how can i hide the other in the 2 different states if so.
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Oct 11, 2012
How to disable the back button of a browser using Javascript.
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Jan 31, 2011
when any Button control is clicked generally it Postback the page to itself, and the same page is regenerated.This is the usual defination of postback in context of a Button Control. But my dear friends i am confused that what is the actual mechanism behind this.Okey say for definition the above statement is fine but believe me i not not getting the actual meaning.What is posting back the Page? What is Page in browser's context? There is only html markup, JavaScript and CSS codes in browser's page.These make up the html page. I think there is no any relation of this Browser's page with ASP.NET Page class. What does it mean that browser's content is posted back to the Page itself ?
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Dec 6, 2010
how can i update another dropdownlist without posting back. i've seen the sample somewhere but its not doing anything.
Code:
<asp:UpdatePanel ID="UpdatePanel1" runat="server" UpdateMode="Conditional">
<ContentTemplate>
<asp:DropDownList ID="DropDownList1" runat="server" AutoPostBack="false" OnSelectedIndexChanged="DropDownList1_SelectedIndexChanged">
<asp:ListItem Value="0">----Select----</asp:ListItem>
<asp:ListItem Value="101">General Admin</asp:ListItem>
[code]...
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May 24, 2010
Here's the code I'm using but it's not working.
[Code]....
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Dec 23, 2010
[Code]....
I have the above code, on the get method I do the following.
[Code]....
It only hits the index once after loading the page. It never goes to the index method.
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Mar 15, 2011
I am trying to implement autocomplete using JQuery. I cannot get this to work directly from my view so I am trying to post directly back to a method in my controller that has a reference to the web service. How do I post directly back to a method in my controller?
My method name is Autocomplete URL: "/" - Takes me to the Index method of my main controller. I want to go to a different method so I can return JSON back
Code below:
[Code]....
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Nov 16, 2010
i have the below page and i am racking my brain as to why when i have two update panels do they both get post backs. i can tell cause i have two user controls- one in each panel and they both fire page load events when only the left panel should be posing back and updating itself... or else whats the point of update panels if in reality the entire page is posting back!
<asp:Content ID="StyleContent" ContentPlaceHolderID="Style" runat="server">
<link href="../Styles/ReportWizard.css" rel="stylesheet" type="text/css" />
<div class="clearFix"></div>
<div class="wizardContainer">
<asp:UpdatePanel runat="server" ID="pnlWizard">
[Code].....
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