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ASP: Html Form action calls automatically on textbox OnTextChanged

I have defined form action in my asp page and with in form, I have defined the Textbox OnTextChanged. but when I type any thing on Textbox and click on tap to move next.. automatically instead of calling OnTextChanged ..my form action calls..
my code is below
<form id="WebToLead" action="https://url" method="POST" runat="server">
<asp:TextBox id="a" name="a" maxlength="10" runat="server" OnTextChanged="a_TextChanged" AutoPostBack="true" />
// some more textbox
<asp:Button ID="Button2" Text="Click" width="50px" runat="server" OnClick="Button2_Click" />
</form>
Means it action should be triggered on button2_click but it does when i type anything on aand tap to other fields

Ensure you have viewstate enabled for this to work, otherwise Asp.Net has no way of knowing whether the control's value has changed.

AutoPostBack is enabled thats why it is posting the form back to server. Remove it or disable it. It should work after that.

How to implement a click event on textbox in ASP.NET?

In my web application I need a functionality so that when users click on textbox to input values, it should make the button and the other fields visible?
I am using the code provided below but, could not get it working.
C#:
protected void TextBox1_Click(object sender, EventArgs e)
{
ButtonSearch.Visible = true;
}
ASP.NET:
<asp:TextBox ID="TextBox1" runat="server" OnTextChanged="TextBox1_TextChanged" OnClick="TextBox1_Click"></asp:TextBox>
<asp:Button ID="ButtonSearch" runat="server" OnClick="ButtonSearch_Click" Text="Search" Visible="False" />
How to accomplish this?

Set AutoPostback="True". This way the event will be fired server-side, and the button will become visible.
<asp:TextBox ID="TextBox1" runat="server" OnTextChanged="TextBox1_TextChanged" OnClick="TextBox1_Click" AutoPostBack="true"></asp:TextBox>
However, if you only want to toogle visility of a button, you really should considerate javascript. This will save a trip back to the server.
<asp:TextBox onclick="txtBox1_ClientClicked()" ID="TextBox1" runat="server" OnClick="TextBox1_Click"></asp:TextBox>
<asp:Button ID="ButtonSearch" runat="server" OnClick="ButtonSearch_Click" Text="Search" style="display:none;" />
<script type="text/javascript">
function txtBox1_ClientClicked(){
var theButton = document.getElementById('<%=ButtonSearch.ClientID%>');
theButton.style.display = 'block';
}
</script>

You do not need to post back to the server to accomplish your job. You can use client side onFocus event and javascript/jquery, for example.
I know I used an input of type text, and you are using an ASP Control which posts on server, but here is a JSFiddle to get you on the right track: http://jsfiddle.net/Mmjtz/1/

$("<%= ButtonSearch.ClientID %>").click(function(){
$("#TextBox1").show():
});
In this code you need to pass fields ID which you want to visible on the click of button.

Put the textbox inside a div and use the div's onClick event from codebehind. It's not what you asked but it works for me without any errors. Here is a javascript function to implement requested event:
function toggleVisibility()
{
document.getElementById('TextBox1').disabled = true;
/*
...some other code...
*/
}
And of course, you have to define your onclick event at the div definition after implementing this JS function.
<div id="TBdiv" onClick="toggleVisibility()">
<asp:TextBox ID="TextBox1"..../>
</div>
IMPORTANT: Since you now disabled your TextBox from codebehind, you have to enable it in somewhere before you want to use it again. Otherwise you will not see it while the page is running.

jQuery is the perfect solution for your problem. The code would be something like this:
$("#TextBox1").on("click",function(){$("#ButtonSearch").css("visibility", "visible");})
You include the script by adding <script src="//ajax.googleapis.com/ajax/libs/jquery/1.11.0/jquery.min.js"></script> to the page and then you can add the piece of code above to within <script></script> tags.

Setting a session variable before AutoPostBack fires in an asp:Button

How would I go about setting a session variable from the click of an ASP:Button before an AutoPostBack event fires.
Here is what I have right now, but I'm not exactly sure I'm doing this right:
<asp:Button ID="CommitBTN" runat="server" PostBackUrl="~/MMR_Home.aspx"
onclick="CommitBTN_Click" UseSubmitBehavior="true"
OnClientClick='<% string temp1 = "true"; Session["ClickedFlag"] = temp1; %>' Text="Commit Changes to Database" />
Would this be the correct way of performing this action or am I going at it completely wrong?
EDIT:
Changed my button tag to this:
<asp:Button ID="CommitBTN" runat="server" PostBackUrl="~/MMR_Home.aspx"
onclick="CommitBTN_Click" OnClientClick="document.getElementById('<%= Hidden.ClientID
%>').value='1'" UseSubmitBehavior="true" Text="Commit Changes to Database" />
I receive this as my error:
Microsoft JScript runtime error: Unable to set value of the property 'value': object is null or undefined

Use this:
Inside aspx file:
<form runat="server">
<asp:Button ID="CommitBTN" runat="server" Text="Button" onclick="CommitBTN_Click" OnClientClick="document.getElementById('HiddenField').value='Ram'"/>
<asp:HiddenField ID="HiddenField" runat="server" />
</form>
Or
<script type="text/javascript">
function setMyHiddenField(myValue) {
document.getElementById('HiddenField').value = myValue;
}
</script>
<form runat="server">
<asp:Button ID="CommitBTN" runat="server" Text="Button" onclick="CommitBTN_Click" OnClientClick="setMyHiddenField('Ram')"/>
<asp:HiddenField ID="HiddenField" runat="server" />
==================================================================
Inside aspx.cs file
protected void CommitBTN_Click(object sender, EventArgs e)
{
Session["ClickedFlag"] = HiddenField.Value;
Response.Write(Session["ClickedFlag"]);
}
It is easy to replase "Ram" with your value. ;)
you can change Ram to temp1 easy:
setMyHiddenField('temp1')
Or you can call this function on your another control events befor CommitBTN pressed

Use a Hidden Field control.
Update the Hidden Field to 1 on Button Client Click.
Update the Session Value in the Page Load' event. The Value will be 1 then update the Session variable and set theHidden Fieldvalue to 0 underneath theSession Variable` Update.
Reason for the Usage of Page Load event is that on clicking the Button as per the page life cycle the page events like PreInit, Init, InitComplete, PreLoad, Load executes before the execution of Button Control.
Page events execution takes place like below..
Preinit
Init
InitComplete
PreLoad
Load
Control Event
Load Complete
Pre Render
Hope this will help you...

Is this the intended behavior of textbox and label?

I set the value of the controls when the DOM loads. I have this super simple code on aspx page:
<script type="text/javascript">
$(document).ready(function () {
$('#<%=textBox2.ClientID %>').val($('#<%=textBox1.ClientID %>').val());
$('#<%=lblVal.ClientID %>').html($('#<%=textBox1.ClientID %>').val());
});
</script>
<asp:TextBox runat="server" ID="textBox1" Text="Test data" />
<asp:TextBox runat="server" ID="textBox2" />
<asp:Label runat="server" ID="lblVal" Text="Old Data" />
<asp:Button runat="server" Text="Click Me" onclick="Unnamed1_Click" />
In my button click event handler I have this code:
protected void Unnamed1_Click(object sender, EventArgs e)
{
Debug.Write(textBox2.Text);
Debug.Write(lblVal.Text);
}
The thing that came shocking to me lblVal has it's old value. Setting value in javascript doesn't really have any effect on label whereas the textbox2's data is reflected on the server. Is the intended behavior of textbox and label? This came as a bit of surprise to me because I never came across this thing previously.

The label will get rendered to an HTML label tag, not a form field. Therefore it does not have a value that is posted when the form is submitted, and the value you get restored in the postback is from ViewState. Form fields (e.g. a ASP TextBox which becomes an input) will post their value and this will override the value in viewstate.
You could get around this by instead having a hidden input which you update with javascript, and then in your postback update the label with the contents of that instead.

An asp:Label control renders to a span, and is therefore not a form element, and its changed contents will not be posted to the server.

Setting focus on top of the page on click of asp.net link button

I've a asp.net datagrid which shows customer order details.
Pagination at the bottom of the grid is done using datalist and asp.net Linkbutton controls.
Here is the code:
<asp:DataList ID="DataList2" runat="server" CellPadding="1" CellSpacing="1"
OnItemCommand="DataList2_ItemCommand"
OnItemDataBound="DataList2_ItemDataBound" RepeatDirection="Horizontal">
<ItemTemplate>
<asp:LinkButton ID="lnkbtnPaging" runat="server"
CommandArgument='<%# Eval("PageIndex") %>'
CommandName="lnkbtnPaging"
Text='<%# Eval("PageText") %>' />
<asp:Label runat="server" ID="lblPageSeparator" Text=" | " name=></asp:Label>
</ItemTemplate>
</asp:DataList>
When the user clicks on any page number(ie.Link button), I need to set focus on top of the page.
How do i do this?
Thanks!

I think the default behaviour would be for the page scroll position to be set back to the top of the page. Is there anything else in your page that might be overriding this behaviour?
For example:
Is your DataList inside an UpdatePanel? In that case the current scroll position will be maintained over a (partial) post-back. You would therefore need to reset the scroll position to the top of the page yourself. One way to do this would be to implement a handler for the PageRequestManager's EndRequest client-side event which would set the scroll position - this thread explains how
Is the Page MaintainScrollPositionOnPostBack property set to true?

You could try setting a named anchor at the top of the page. Here is an article that explains it http://www.w3schools.com/HTML/html_links.asp

After an AJAX partial postback you may need to return to the top of your ASPX page to display an error message, etc. Here is one way that I have done it. You can add the JavaScript function below to your ASPX page and then call the method when needed in your code-behind by using the ScriptManager.RegisterClientScriptBlock method.
ASP.NET C# Code-behind:
ScriptManager.RegisterClientScriptBlock(this, Page.GetType(),
"ToTheTop", "ToTopOfPage();", true);
JavaScript:
<script type="text/javascript">
function ToTopOfPage(sender, args) {
setTimeout("window.scrollTo(0, 0)", 0);
}
You can also just JavaScript to scroll to the top of the page by using the OnClientClick property of your button. But this will cause this behavior to occur every time the button is clicked and not just when you want it to happen. For example:
<asp:Button id="bntTest" runat="server"
Text="Test" OnClick="btn_Test" OnClientClick="javascript:window.scrollTo(0,0);" />

<asp:LinkButton ID="lbGonder" runat="server" CssClass="IK-get" ValidationGroup="ik" OnClick="lbGonder_Click" OnClientClick="ddd();" title="Gönder">Gönder</asp:LinkButton>`
<script type="text/javascript">
var ddd = (function () {
$('body,html').animate({
scrollTop: 300
}, 1453);
return false;
});