I am trying to get html textbox value when click on html button without using "runat" attribute.I need to do it in code behind ,is it possible?
<button id="button1" onclick="btnclick">Click Here</button><input type="text" id="txtBox1" name="txtBox12" />
and My code Behind is like:
protected void btnclick(object sender, EventArgs e)
{
string name = Request.Form["txtBox12"];
Response.Write(name);
}
MODIFIED
To access any control in code behind it needs to have runat=server attribute attached to it.
In your case, like you pointed you can transfer the value of input text to asp hidden field and then access
its value on button click in server-side but in this case too you have to place hidden field inside form runat=server tag.
<form id="form1" runat="server">
<input type="text" id="txt" onkeyup="PassValue(this);";/>
<asp:HiddenField ID="hf" runat="server" />
<asp:Button ID="Button1" runat="server" Text="Go" onclick="Button1_Click" />
</form>
-----------------------
<script type="text/javascript">
function PassValue(obj) {
document.getElementById("hf").value = obj.value;
}
</script>
Related
I have created a ASP.NET Empty Website in a new install of Visual Studio 2017 Community. I am attempting to replicate the steps shown by the following tutorial: https://youtu.be/5dCAXwhjIYU
I'm simply planting three text boxes on the form, along with a submit button. When i double click the button, The IDE simply highlights the HTML for the button in the source view of the page. It does not create the event handler in the code-behind as shown in the video and as expected.
I manually created the event handler for the button click in the code behind. When I try to run the code, it is telling me that the fields I'm referencing do not exist:
Error CS0103 The name 'UserName' does not exist in the current context
Here's my HTML code:
<%# Page Language="C#" AutoEventWireup="true" CodeFile="Users.aspx.cs" Inherits="Users" %>
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
</head>
<body>
<form id="form1" runat="server">
<div>
UserName<br />
<input id="UserName" type="text" /><br />
UserEmail<br />
<input id="UserEmail" type="text" /><br />
UserCampus<br />
<input id="UserCampus" type="text" /><br />
<input id="SaveUser" type="submit" value="submit" /></div>
</form>
</body>
</html>
The C# code:
public partial class Users : System.Web.UI.Page
{
protected void SaveUser_Click(object sender, EventArgs e)
{
SqlConnection BIGateConnection = new SqlConnection("Data Source=xxxxxxx;Initial Catalog=xxxxxxx;Integrated Security=True");
{
SqlCommand BIGateSQLCmd = new SqlCommand("Insert into [BIGateway].[dbo].[User] (UserName, userEmail, userCampus) VALUES (#userName, #userEmail, #userCampus)", BIGateConnection);
BIGateSQLCmd.Parameters.AddWithValue("#", UserName.Text);
BIGateSQLCmd.Parameters.AddWithValue("#", UserEmail.Text);
BIGateSQLCmd.Parameters.AddWithValue("#", UserCampus.Text);
}
}
}
What the heck am I doing wrong?
if you have taken HTML text box then code is as follows:
<input id="UserName" type="text" /><br />
In this you will have to add the line on your own as runat="server"
It will look as follows:
<input id="UserName" type="text" runat="server"/><br />
Then you can use it for serverside.
Hope its helpful.
Video doesn't show the ASPX page. I believe he used TextBox and Button server controls.
<form id="form1" runat="server">
<div>
UserName<br />
<asp:TextBox runat="server" ID="UserName"/><br />
UserEmail<br />
<asp:TextBox runat="server" ID="UserEmail"/><br />
UserCampus<br />
<asp:TextBox runat="server" ID="UserCampus"/><br />
<asp:Button runat="server" ID="SaveUser" OnClick="SaveUser_Click" Text="Submit"/>
</div>
</form>
If he used regular html input with runat="server", he will have to access the value as UserName.Value inside Button1_Click event which he did not.
Afais you didn't find the click event to the button.
Add
SaveUser.OnClick += SaveUser_Click;
To the page_load event.
In general I would prefer asp:Button instead of input.
In fact it's rendered as a input control. But with more options. But indeed runat="server" is missing for the input.
I have a user control which acts as a form for updating student records. This user control is used in a page called students update. After the update is sucessfull, I want to disable the update button. After that, if the user changes any text, the update button should be enabled back. I am trying this but it is not working. I have all my textboxes autopost property to true. I am able to disable, but I am not able to enable it again if user starts entering new text in the text box. I am using the textbox.textchanged event to achieve this.
A Jquery approach :
<body>
<form id="form1" runat="server">
<div>
<asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>
<asp:Button ID="Button1" runat="server" Text="Button" Enabled="false" />
</div>
</form>
<script src="http://ajax.aspnetcdn.com/ajax/jquery/jquery-1.9.0.min.js" type="text/javascript"></script>
<script type="text/javascript">
$("#<%= TextBox1.ClientID %>").keyup(function () {
$("#<%= Button1.ClientID %>").attr("disabled", $(this).val() == "");
});
</script>
</body>
Or you can do this server-side :
<asp:textbox id="TextBox1" runat="server" autopostback="True" ontextchanged="TextBox1_TextChanged"></asp:textbox>
<asp:button id="Button1" runat="server" enabled="False" text="Button" />
protected void TextBox1_TextChanged(object sender, EventArgs e)
{
Button1.Enabled = !String.IsNullOrEmpty(TextBox1.Text);
}
#Hoangnnm solution looks OK. Just include the later jQuery Lib, e.g. version 1.9.0 instead of 1.4.1 which is quite obsolete:
<script src="http://ajax.aspnetcdn.com/ajax/jquery/jquery-1.9.0.min.js" type="text/javascript"></script>
I'm trying to upload file in tow scenarios
First:
<input id="File2" runat="server" name="name" type="file" clientidmode="Static" />
<asp:Button ID="Button4" runat="server" clientidmode="Static"
Text="Go CodeBehind To Get Input Value" OnClick="btnUploadClick" />
This works correctly and the postedFile not null in code behind C#
protected void btnUploadClick(object sender, EventArgs e)
{
HttpPostedFile postedFile= Request.Files[0];
}
Second:
I want to change the browse button "text" and I know already , can't do that directly so i worked around it like that:
<b>
<asp:Content ID="BodyContent" runat="server" ContentPlaceHolderID="MainContent" >
<input id="File1" runat="server" name="name" type="file" clientidmode="Static" onchange="setHiddenValue()" style=" visibility:hidden;" />
<br />
<input id="Button2" type="button" clientidmode="Static" onclick="triggerFileUpload()" value="HTML Button" />
<br />
<asp:Button ID="Button3" runat="server" clientidmode="Static" Text="Go CodeBehind To Get Input Value" OnClick="btnUploadClick" />
<script language="javascript">
function triggerFileUpload() {
document.getElementById("File1").click();
}
</script>
</asp:Content>
<b>
protected void btnUploadClick(object sender, EventArgs e)
{
HttpPostedFile postedFile= Request.Files[0];
}
When I press the Button2 the fileDialog open, I select file and everything Ok.
But when I press Button3 to get file in server side c# the Request.Files[0] is null
and Found no file posted.
I want the Request.Files[0] because I want save it in database as byte
so please if u have any idea I'll appreciate it
Thank You in advance
I did the same code (second scenario) in a blank project, and this works fine. You could do the same and check it.
Probably something around this slice of code is breaking this. Check if masterpage or current page Page_Load() method have something that break the file 'postback'. You can try:
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
//Page_Load code
}
}
I am using JQuery for autocompleting the search textbox with my database. The problem rises when I want to access the text of the search textbox in query string since I am using html textbox. To make it in context, either I have to use runat="server" or I can use asp:Textbox but in both the cases my autocompleting feature stops working.
Here is the aspx code:
<div id="search-location-wrapper">
<input type="text" id="txtSearch" class="autosuggest" />
<div id="search-submit-container">
<asp:Button ID="btnSearch" runat="server" Text="Search"
onclick="btnSearch_Click"></asp:Button>
</div>
</div>
C# Code:
protected void btnSearch_Click(object sender, EventArgs e)
{
string location = txtSearch.ToString(); /*Here is the error: txtSearch is not in current context */
int id = Convert.ToInt32(ddlCategory.SelectedValue);
string url = "SearchResults.aspx?Id="+id+"&location="+location;
Response.Redirect(url);
}
Your problem is likely just that ASP.NET is changing the ID of your textbox when you put the runat="server" on it. Your jQuery probably has something like:
$("#txtSearch")
Instead, add the runat="server" to your textbox and then change it to:
$("#<%= txtSearch.ClientID %>")
When the page renders, it will put the correct ID in for the textbox.
you can use asp:Textbox without stoping jquery:
ASP:
<asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>
jQuery selector :
$("#TextBox1")
if you have a masterpage or a gridview you can get your element client id by using Inspect Element in your browser..
ASP:
<asp:Content ID="Content2" ContentPlaceHolderID="ContentPlaceHolder1" Runat="Server">
<asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>
</asp:Content>
jQuery selector :
$("#ContentPlaceHolder1_TextBox1")
I have an html form with hidden values empty like below
<body>
<form runat="server" id="PostToMPI" name="PostToMPI" method="post" action="https://www.e-tahsildar.com.tr/V2/NetProvOrtakOdeme/NetProvPost.aspx" >
<asp:HiddenField ID="pHashB64" runat="server" Value="" />
<asp:HiddenField ID="pHashHex" runat="server" Value="" />
<asp:Button ID="Button1" runat="server" Text="Button" OnClick="Button1_Click" />
</form>
in the c#
protected void Button1_Click(object sender, EventArgs e)
{
pHashB64.Value = "calculated value";
pHashHex.Value = "calculated value";
}
it is using post method. when the user clicks the button, I am calculating the values set them to the hidden fields.
I am wondering if it submits the form before it sets the hidden fields? I mean that I am posting with empty fields?
thank you
When you specify action attribute in form tag, it transfers your request to that URL instead of firing postback in the same page and executing button click event.
Rather you can use querystring method whose URL will be generated in button click event and redirecting to the URL set in action attribute.
<form runat="server" id="PostToMPI" name="PostToMPI" method="post" >
<asp:HiddenField ID="pHashB64" runat="server" Value="" />
<asp:HiddenField ID="pHashHex" runat="server" Value="" />
<asp:Button ID="Button1" runat="server" Text="Button" OnClick="Button1_Click" />