I have a form with 5 text boxes and a button, and when the button is clicked it send the data to a SQL database. I would like the button to be disabled if any of the text boxes are null, how do I do this in C#? (I am in Visual Studio 2010 ASP.NET web app)
You need to write JavaScript/jQuery code.
Yes, What Sam said is right!!
you need to check first whether all your text boxes are empty or not.
that will be done by
If(txtbox1.text == "" || txtbox2.text == "" || txtbox3.text == "" || txtbox4.text == "" || txtbox5.text == "")
If any of the text box is empty then make the button disabled.
button1.enable = false;
If all are filled then make it as enabled.
button1.enable = true;
If you do not want to use Client side scripts, you can use validations for your controls
<asp:TextBox id="TextBox1" runat="server" />
<asp:RequiredFieldValidator id="RequiredFieldValidator1"
runat="server" ErrorMessage="Required!" ControlToValidate="TextBox1" >
</asp:RequiredFieldValidator>
Validation will trigger on postbacks.
If you have multiple controls, but you do not want to validate them all, you can use Validation Group. Check this link for using Validation Groups
use javascript setInterval on Page load if if you are using this single form on the page and check each textbox value length .. if anyone is null then disable submit button..
use jquery to disable and enable them.. check following code snippet that i have created for sample..
use this to access server control id if you are using these controls inside some container control eg. panel, contentplaceholder etc : $("#<%=button1.ClientID>%>")
$("#text1").val().length will check then length of text in textbox.. and then use jquery to enable and disable them..
<head runat="server">
<title></title>
<script src="http://code.jquery.com/jquery-1.7.min.js" type="text/javascript"></script>
<%-- <script src="http://ajax.aspnetcdn.com/ajax/jQuery/jquery-1.7.min.js" type="text/javascript"></script>--%>
<%--<script src="http://ajax.aspnetcdn.com/ajax/jQuery/jquery-1.7-vsdoc.js" type="text/javascript"></script>--%>
<script type="text/javascript">
$(document).ready(function () {
$("#submit").attr('disabled', 'disabled');
$("#text1").keypress(function () {
check();
});
var intv = self.setInterval("check()", 1000);
});
function check() {
if ($("#text1").val().length > 0) {
$("#submit").removeAttr('disabled');
}
else {
$("#submit").attr('disabled', 'disabled');
}
}
</script>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:TextBox ID="text1" runat="server"></asp:TextBox>
<asp:Button ID="submit" runat="server" Text="Button" />
</div>
</form>
</body>
</html>
Related
Is there any way to select all text within a multiline asp:textbox and copy it to client clipboard by clicking a button, using c#?
Thank you in advance.
You can use document.execCommand("copy"); just be aware that this is supported by new browsers mostly and as far as I know there is no support for Safari:
<head runat="server">
<title></title>
<script src="https://code.jquery.com/jquery-1.12.2.min.js"></script>
<script type="text/javascript">
$(function () {
$("#btnCopy").click(function () {
var id = "#" + "<%= txtText.ClientID %>";
try {
$(id).select();
document.execCommand("copy");
}
catch (e) {
alert('Copy operation failed');
}
});
});
</script>
</head>
<body>
<form id="form1" runat="server">
<asp:TextBox ID="txtText" runat="server" Text="Some sample text to copy"></asp:TextBox>
<button id="btnCopy">Copy</button>
</form>
</body>
Tested and works with the following browsers:
IE 11 and up
Google Chrome 51.0.2704.84
Firefox 43.0.1
I think #Denis Wessels answer was great but used plain textarea instead of asp:TextBox, therefore I want to write my own that includes asp:TextBox control.
Consider you have a multi-line text area with asp:TextBox server control and a button to copy content into clipboard:
<asp:TextBox ID="TextArea" runat="server" TextMode="MultiLine">
<button id="copy">Copy to Clipboard</button>
Use jQuery and a JS function similar to this:
<script type="text/javascript">
$(document).ready(function () {
$("#copy").click(function() {
// use ASP .NET ClientID if you don't sure
// for ASP .NET 4.0 and above, set your ClientID with static mode
var textarea = "<%= TextArea.ClientID %>";
$(textarea).select();
$(textarea).focus(); // set focus to this element first
copyToClipboard(document.getElementById(textarea));
});
});
function copyToClipboard(elem)
{
var result;
var target = elem;
startPoint = elem.selectionStart;
endPoint = elem.selectionEnd;
var currentFocus = document.activeElement;
target.setSelectionRange(0, target.value.length);
try
{
// this may won't work on Safari
result = document.execCommand("copy");
}
catch (e)
{
return alert("Copy to clipboard failed: " + e);
}
// returning original focus
if (currentFocus && typeof currentFocus.focus === "function") {
currentFocus.focus();
}
elem.setSelectionRange(startPoint, endPoint);
return result;
}
</script>
Reference with minor changes: https://stackoverflow.com/a/22581382, https://stackoverflow.com/a/30905277
Note that for ASP .NET 4 and above you can set static ClientID:
<asp:TextBox ID="TextArea" runat="server" TextMode="MultiLine" ClientID="TextArea" ClientIDMode="Static">
thus you can use $("#TextArea") directly rather than $("<%= TextArea.ClientID %>").
You can use this class:
System.Windows.Forms.Clipboard.SetText(..) <= Sets the text to clipboard,
Inside SetText(), you put textbox.Text to get the text from the multiline asp.net textbox.
function copyToClipboard(element) {
var $temp = $("<input>");
$("body").append($temp);
$temp.val($(element).text()).select();
document.execCommand("copy");
$temp.remove();
}
<link href='https://fonts.googleapis.com/css?family=Oswald' rel='stylesheet' type='text/css'>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>
<center>
<p id="p1">Hello, I'm TEXT 1</p>
<p id="p2">Hi, I'm the 2nd TEXT</p><br/>
<button onclick="copyToClipboard('#p1')">Copy TEXT 1</button>
<button onclick="copyToClipboard('#p2')">Copy TEXT 2</button>
<br/><br/><input type="text" id="" placeholder="TEST it here;)" />
</center>
Browse and Upload with using asp:FileUploadcontrol is working perfectly fine.
But It is two step process. First we have to browse and then select the file.
I want it working in single step So for making it single step I tried the following code:
protected void Button1_Click(object sender, EventArgs e)
{
//to launch the hidden fileupload dialog
ClientScript.RegisterStartupScript (GetType(),
"hwa", "document.getElementById('fileupload').click();", true);
//Getting the file name
if (this.fileupload.HasFile)
{
string filename = this.fileupload.FileName;
ClientScript.RegisterStartupScript(GetType(), "hwa", "alert('Selected File: '" + filename + ");", true);
}
else
{
ClientScript.RegisterStartupScript(GetType(), "hwa", "alert('No FILE has been selected');", true);
}
}
In this code, there is one fileUpload control that is being invoked on Button1_Click. Ideally it should execute the first line then A file Upload control should be shown and after selecting a file or canceling the dialog, flow should go to next line. But dialog is showing up after full function execution finishes.
Because of this asynchronous or not expected execution flow if (this.fileupload.HasFile) is returning false(because user has not been asked to select any file yet) and I am not getting the selected file name.
Can we modify this code to achieve file upload in single step? Or if any other way is possible to do this?
Note- I have asked not to use window forms and Threads. So solution by using these two is not acceptable.
You are missing the fact there is a client side/server side disconnect in the web environment.
Your line: ClientScript.RegisterStartupScript (GetType(),"hwa","document.getElementById('fileupload').click();", true); is client side code and will not be executed until the serverside script is comleted and the resulting HTML/javascript/CSS returned to the browser as it is client side javascript. YOu want to be leveraging the onchange event of the file upload control.
The question should help you out: ASP.NET FileUpload: how to automatically post back once a file is selected?
this is not exactly what you are looking for but it does what you want. difference is that instead of clicking a separate button you have to click the Browse button. and when you press the Open button, the page will postback. I have used JQuery for this. here's my code
ASPX
<head runat="server">
<title></title>
<script src="Scripts/jquery-1.9.1.min.js"></script>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:FileUpload ID="fileupload1" runat="server" />
<asp:Button ID="btn" runat="server" OnClick="btn_Click" Text="upload" style="display:none" />
</div>
<script type="text/javascript">
var isfirst = true;
$(function () {
$('#<%= fileupload1.ClientID %>').on('change', function (e) {
console.log('change triggered');
$('#<%= btn.ClientID%>').trigger('click'); // trigger the btn button click which i have hidden using style='display:none'
});
});
</script>
</form>
</body>
Code behind
protected void btn_Click(object sender, EventArgs e)
{
//TODO
}
For the ones who land here late,
<div>
<asp:FileUpload ID="fu" runat="server" CssClass="bbbb" onchange="clickSeverControl()"/>
<asp:LinkButton Text="Upload" ID="lnkUpload" runat="server" OnClientClick="showUpload();return false;" OnClick="lnkUpload_Click"/>
</div>
hide the file control with css
<style>
.hiddenStyle {
visibility:hidden;
}
</style>
on client click event of link button trigger the click of file upload control
function showUpload() {
document.getElementById("fu").click();
}
on change event trigger the server side click
function clickSeverControl() {
__doPostBack('<%= lnkUpload.ClientID %>', 'OnClick');
}
on server click save the uploaded file
protected void lnkUpload_Click(object sender, EventArgs e)
{
fu.PostedFile.SaveAs(Server.MapPath("~/Upload") + "/" + fu.PostedFile.FileName);
}
Thanks for the other answer I have just combine two example and got the solution for my problem in my project
<head runat="server">
<title></title>
<script src="Scripts/jquery-1.9.1.min.js"></script>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:FileUpload ID="fileupload1" runat="server" />
<asp:Button ID="btnUploadBulk" runat="server" OnClick="btn_Click" Text="upload" style="display:none" />
</div>
<script type="text/javascript">
var isfirst = true;
$(function () {
$('#<%= btnUploadBulk.ClientID%>').on('click', function (e) {
showUpload();
})
});
function showUpload() {
var control = document.getElementById("<%= FileUploadControl.ClientID %>");
control.click();
}
</script>
</form>
Code Behind
protected void btn_Click(object sender, EventArgs e)
{
//TODO
}
This worked for me
in my project i am checking links whether its working or not ,when i click on create link button i want to display please wait for while but when and when if their some text in text box1if textbox1.text == null then it should not be display and when its not null then when i will click create button it should show please wait,my code is working but i want to check if their is some value in text box and user click the create button it should show please wait a while .if their no value in textbox1 then if user click on create button then please wait should not be displayed
here is my code
<script type="text/javascript">
function ShowProgressBar() {
if (Textbox1.Text == " ") {
document.getElementById('dvProgressBar').style.visibility = "hidden";
}
else {
document.getElementById('dvProgressBar').style.visibility = "visible";
}
}
</script>
<asp:Button ID="Button1" runat="server" Text="Create link" OnClick="btn_createlink_Click" OnClientClick="javascript:ShowProgressBar()" />
<br />
<div ID="dvProgressBar" style="visibility: hidden;">
<div id="content" style="text-align: left; " >
Please wait for while...
</div>
</div>
<asp:TextBox ID="TextBox1" runat="server" TextMode="MultiLine" Height="373px"
Width="410px" ViewStateMode="Enabled"></asp:TextBox>
From what I understand, you are only asking how to verify if the checkbox is empty, right? This should do it:
<script type="text/javascript">
function ShowProgressBar() {
if (document.getElementById('<%=TextBox1.ClientID%>').value == "") {
document.getElementById('dvProgressBar').style.visibility = "hidden";
}
else {
document.getElementById('dvProgressBar').style.visibility = "visible";
}
}
</script>
Easiest way to do this is probably to use ajax. Simply call a web service and use javascript to show a loading message/icon/whatever for the user. Try to use google for this, it's really straightforward.
It has to be asynchronous, or else it would block your UI and the please wait wouldn't show.
I have a dropDownlist in my project and i am adding items to it in javascript. Now i want to get selected index in C# (on a button click event). But i am unable to do this because it seems to be a problem that viewstate is not maintained.
Further more i have
EnableEventValidation="false"
in my Page
Please tell me how can i achieve this functionality? Right Now i am adding selected values in a hidden field and then accessing that hidden field in C#. Its working but i want "cleanliness".
Regards
When ASP.NET performs a form POST the drop down options need to be passed through to the server and be recreated there for further processing.This is achieved through ViewState.
I'm not aware of any other way of doing this, what you can do however is retrieve the selected value of the drop down using Request.Form[ddlProducts.UniqueID] if you can figure out the item index based on the selected value, great! Else I think hidden fields are your only option
Here's a complete example:
<head runat="server">
<title></title>
<script type="text/javascript">
window.onload = function () {
var select = document.getElementById("ddlProducts");
select.options[select.options.length] = new Option('Product 1', 'Value 1');
select.options[select.options.length] = new Option('Product 2', 'Value 2');
select.options[select.options.length] = new Option('Product 3', 'Value 3');
}
</script>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:DropDownList ID="ddlProducts" runat="server">
</asp:DropDownList>
<asp:Button ID="btnOK" runat="server" Text="OK" OnClick="Process" /> <span id="output"
runat="server" />
</div>
</form>
</body>
</html>
protected void Process(object sender, EventArgs e)
{
int selectedIndex = ddlProducts.SelectedIndex;
output.InnerHtml = Request.Form[ddlProducts.UniqueID];
}
I am using javascript for customValidator to validate textboxes in ASP.Net.
The code works perfectly when I am using a normal page, but as soon as I put that inside a MasterPage, the code doesn't work.
Below is the code for my aspx page. If I put this code inside a MasterPage it doesn't work.
Could you guys advise me how to make this work inside a MasterPage
Thanks,
Abhi.
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
</head>
<body>
<form id="form1" runat="server">
<script type="text/javascript">
function validateOrFields(source, args){
var sUser = document.getElementById('TextBox1');
if (sUser.value == "")
{
args.IsValid = false;
}
else
{
args.IsValid = true;
}
return;
}
<div>
<asp:TextBox ID="TextBox1"
runat="server"></asp:TextBox>
<asp:CustomValidator ID="FieldValidator"
runat="server"
Text="Enter either a user name"
ClientValidationFunction="validateOrFields" onservervalidate="FieldValidator_ServerValidate"/>
<asp:Button ID="Button1" runat="server" Text="Button" />
</div>
</form>
</body>
</html>
The problem is the ID of the TextBox. When placed in the Master Page, it gets a different ClientID.
var sUser = document.getElementById('<%= TextBox1.ClientID %>');
you need to get the id by using ClientID
Replace your code by
var sUser = document.getElementById('<%= TextBox1.ClientID %>');
Try document.getElementById('ct100_TextBox1').value. It is just a temporary fix!! But anyone please suggest how to get this ID dynamically using code. I got this by viewing source of the page generated. I have also posted the same question here
link text