how do i simply type a value in 1 box and have it populate in another using the asp:textbox. I simply want to pull value from 1 asp:textbox and put it in another, ultimately i am going to be adding the sum of 2 boxes and placing it in another, I would like this to happen in real time and not use a button.
Use javascript:
<asp:TextBox ID="txtTextSource" runat="server" onblur="TextSource_OnBlur(this)" />
<asp:TextBox ID="txtTextDestination" runat="server" />
<script type="text/javascript">
function TextSource_OnBlur(oElement) {
var destination = document.getElementById('<%= txtTextDestination.ClientID %>');
destination.value = oElement.value;
}
</script>
Instead of ASP.net, use jQuery for this since it'll avoid post backs.
hook onto the change event of textbox1 and populate text box 2 using jQuery. Try it and let us know.
I agree with raja, you should use client side JavaScript (doesn't have to be jQuery) to handle this since it doesn't require server interaction. But let's say for some crazy reason you want it to happen on the server.
First Number: <asp:TextBox runat="server" id="TB1" /><br />
Second Number: <asp:TextBox runat="server" id="TB2" /><br />
<asp:Button runat="server" id="CalculateBtn" OnClick="CalculateBtn_Click" Text="Calcualte Sum" />
Sum: <asp:TextBox runat="server" id="SumTB" />
Code Behind
protected void CalculateBtn_Click (object sender, EventArgs e)
{
int num1 = Int32.Parse(TB1.Text);
int num2 = Int32.Parse(TB2.Text);
int sum = num1+num2;
SumTB.Text = sum.ToString();
}
Obviously you can get much more fancy, using doubles instead of ints and verifying that the user typed a valid number and using ScriptMethods or UpdatePanels to do it in real time without the need for a button. But seriously, stick with a client side solution.
$('.amount-input').live('blur', function () {
var amountSum = 0;
$('.amount-input').each(function () {
amountSum += parseInt($(this).val());
});
$('#<%= Damount.ClientID %>').val(amountSum);
enter code here
just used java script and called the total amount which is "Damount" from the server code. Still wish it changed in real time except for when i click off the textbox but hey it works!
Related
I want to hide Labels and buttons while working with my code in WPF C# (using Visual Studio)
Is there any way I can do this
You can add the attribute d:IsHidden="true" on these elements.
See this post:
add if not already present xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
put d:IsHidden="true" on element you want to hide at design time only
Aspx page:
___________
Enter Name:
<asp:TextBox ID="txtName" runat="server" />
<br />
<asp:Button Text="Submit" runat="server" OnClick="Submit" /><br />
<br />
<asp:Label ID="lblMessage" ForeColor="Green" Font-Bold="true" Text="Form has been submitted successfully." runat="server" Visible="false" />
Below is the code to make the Label visible on button click.
_________________________________________________________
protected void Submit(object sender, EventArgs e)
{
lblMessage.Visible = true;
ClientScript.RegisterStartupScript(this.GetType(), "alert", "HideLabel();", true);
}
Automatically Hiding Label control after 5 seconds using JavaScript
___________________________________________________________________
Below is the JavaScript function that will hide the Label after 5 seconds. This function gets called using ClientScript RegisterStartupScript method when the Button is clicked.
A variable seconds holds the value which determines after how many seconds the Label will hide. You can set whatever value you need in seconds as per your requirement.
Finally within JavaScript setTimeout function, the Label is hidden by setting its CSS display property to none and the timeout is specified by multiplying the ‘seconds’ variable to 1000 as setTimeout function accepts value in Milliseconds.
<script type="text/javascript">
function HideLabel() {
var seconds = 5;
setTimeout(function () {
document.getElementById("<%=lblMessage.ClientID %>").style.display = "none";
}, seconds * 1000);
};
</script>
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.
I am trying to post back on a button click.But unable to get __EVENTTARGET and __EVENTARGUMENT. It is currently always null. Is there any other entries I have to do?
aspx
<asp:Button ID="btn" runat="server" OnClientClick="GetDet();" Text="Click"/>
<script type="text/jscript">
function GetDet() {
var obj = $('.output');
var sign = $('.name'); //hidden field
__doPostBack('btn', sign.val());
}
</script>
.cs
string tar = Convert.ToString(Request.Params.Get("__EVENTTARGET"));
string val = Convert.ToString(Request.Params.Get("__EVENTARGUMENT"));
Instead of doing such a hack. I'd actually recommend you to do things the proper way so you can guarantee scalability because you never know what's gonna happen on the next release of ASP.NET and the ASP.NET Team certainly does not endorse these types of hacks, in other words, your hacks might break with a future releases of ASP.NET...always strive to avoid them. So, if you want to do a full postback you definitely don't need javascript for this....
<asp:Button ID="btn" runat="server" Text="Click"/>
Then, if you want to post the value of the hidden field simply add the hidden field to the form...
<asp:HiddenField ID="hdfName" runat="server" Value="whatever" />
if you want to read the value of the hidden field during the postback...
public override void OnLoad(EventArgs args)
{
var name = hdfName.Value;
}
That's how you are supposed to work with ASP.NET the proper way rather than trying to hack its intrinsics
I was wondering if you guys could help me understand hidden fields, since I don't think I am getting them to work.
On the aspx page I have:
<asp:HiddenField ID="hidVal" value="" runat="server" />
On a button click I have a JavaScript function called
<button type="button" id="search" onclientclick="search_click()">Search</button>
With the function being
function search_click() {
document.getElementById('hidVal').Value = "1";
<% save(); %>
}
In aspx.cs I have a function that does this:
using (System.IO.StreamWriter file = new System.IO.StreamWriter(#"C:\Users\fgreene\Desktop\savedAdresses.txt", true))
{
file.WriteLine(hidVal.Value);
}
After clicking the button I look into the file and there is no change.
Is my approach correct or am I not understanding how this works?
Putting <% save(); %> in a JavaScript function in an aspx page causes save to be run when the page is built on the server, not when the surrounding JavaScript function is called on the client. At this point, the hidden field is empty, so your file gets a blank line written to it. When the user clicks the button, the hidden field is filled, but there's nothing to tell the server that this has happened.
What you need to do instead is something like:
// In your aspx, for the javascript function: remove the call to save,
// use the correct ID for the hidden field
function search_click() {
document.getElementById('<%= hidVal.ClientID %>').Value = "1";
}
// In your aspx in place of the button put
<asp:Button id="search" runat="server"
onclientclick="search_click(); return true;" onclick="search_click">
Search
</asp:Button>
// This results in a button that calls the javascript function on click, and
// then posts back to the server saying that the button has been clicked
// In your C#, this function gets called when the client posts back to
// say that the button has been clicked.
public protected void search_click(object sender, EventArgs e)
{
using (System.IO.StreamWriter file = new System.IO.StreamWriter(
#"C:\Users\fgreene\Desktop\savedAdresses.txt", true))
{
file.WriteLine(hidVal.Value);
}
}
You'll need to reference the client ID of the hidden field, which is probably not hidVal, as the actual client side ID generated in the HTML will be based on the parent control's naming container. There's two ways to fix this. First, you could make the client ID static on the control (which basically tells ASP.NET make the ID exactly what I said.):
<asp:HiddenField ID="hidVal" value="" ClientIDMode="Static" runat="server" />
Second, you can look up the ClientID property from the server when you generate your JavaScript:
document.getElementById('<%= hidVal.ClientID %>').Value = "1";
This would render out the actual client ID directly in the JavaScript code. Either approach is probably fine, but the second one would only work if the JavaScript is embedded directly in your ASPX file and not in a static .JS file.
Calling server side methods:
The second part of your question is about calling server side code when the button is pressed. You should do this by attaching an OnClick handler to your button:
<button runat="server" id="BtnSearch" onclientclick="search_click()" OnClick="btnSearch_Click">Search</button>
When the button is pressed, the page will be posted back and the btnSearch_Click event handler will be called. You'll then be able to handle any server side logic, as well as check the value of your hidden field. Hope this helps!
What you're trying to do is execute a server side function (save) via a client side call. This won't work as it is calling save() when the page first loads and then putting the return value (which is probably nothing) into the code where you put
<% save(); %>
Instead you need your button to fire the save function, but fire your javascript first. You do this by creating an asp:button (which renders as ) and then adding both an "OnClientClick" (for your javascript) and "OnClick" (for your server side function).
<asp:Button id="btnSearch" runat="server" OnClick="btnSearch_Click" OnClientClick="search_click()" text="Search" />
Then in your C# code you need the method to be named the same as the OnClick value:
protected void btnSearch_Click(object sender, EventArgs e)
{
using (System.IO.StreamWriter file = new System.IO.StreamWriter(#"C:\Users\fgreene\Desktop\savedAdresses.txt", true))
{
file.WriteLine(hidVal.Value);
}
}
The easiest way to create your server side function is to double click on the button in design view, as it will add the correct method call for you.
Hope this helps.
You can change hidden field value in both serverside and client side events.
Change value in client side
<script type="text/javascript">
function setvalue() {
document.getElementById('hidVal').value = "1";
}
</script>
<div>
<asp:HiddenField ID="hidVal" value="" runat="server" />
<br />
<asp:Button ID="Button1" runat="server" Text="Button" OnClientClick="setvalue();" />
</div>
Change value in serverside
<div>
<asp:HiddenField ID="hidVal" value="" runat="server" />
<br />
<asp:Button ID="Button1" runat="server" Text="Button" onclick="Button1_Click" />
</div>
protected void Button1_Click(object sender, EventArgs e)
{
hidVal.Value = "1";
}
I have a asp file upload for pictures and what I want to do is, when the file chosen has the same name as the previous file it should pop something up that says "This image name already exists, do you want to replace it? if yes then it would just override the current picture with the new one but if not then just leave it alone. How can I do this?. Right now I have this. Also if the solution is in javascript I could also use that (but i am not too good with javascript :) ) Thank you
<div class="style">
Choose an Image: <asp:FileUpload ID="getImage" runat="server" Width="150px" BorderStyle="Inset" EnableViewState="true" />
<asp:RegularExpressionValidator ID="RegularExpressionValidator"
runat="server" ControlToValidate="getImage" CssClass="Error" Display="dynamic" ValidationExpression=".*(\.[Jj][Pp][Gg]|\.[Gg][Ii][Ff]|\.[Jj][Pp][Ee][Gg]|\.[Pp][Nn][Gg])" ErrorMessage="Select a correct file format"></asp:RegularExpressionValidator>
</div>
Please be aware I am a total newbie with Javascript so if that is what's going to work please explain as if I was a 5 year old.
I really appreciate the help.
My solution will perform the check just before postback. I also use jquery a little bit.
The important piece of the puzzle here is retrieving the previous file name. I created a PageMethod to do this part. So in my aspx.cs file I have a function that looks like this:
using System.Web.Services;
.......
[WebMethod()]
public static string GetPreviousFileName()
{
//put logic here to get the filename to compare against.
return "somefilename.ext";
}
You'll need to implement your own logic for how to retrieve the file name. Another, simpler but less flexible, approach for handling the previous file name would be to add an asp:hiddenfield to your page and populate it with the name of the previous file on page load. Then you could compare by reading $('#<%= hiddenField.ClientID %>').val().
Next I used the following code for my file upload control and a submit buton:
<asp:ScriptManager ID="sm" runat="server" EnablePageMethods="true" />
<div>
<asp:FileUpload ID="fu" runat="server" />
<asp:Button ID="btnUpload" runat="server" OnClientClick="return checkDuplicateFile();" Text="Upload File" />
</div>
Two important things to note here: The ScriptManager has EnablePageMethods="true" and the asp:button has an OnClientClick attribute specified. Lastly, the javascript part of the solution which retrieves the value from the page method and and compares the file names:
<script src="Scripts/jquery-1.4.1.min.js" type="text/javascript"></script>
<script type="text/javascript">
var oFilename = "";
$(function () {
//get original file name on page load
PageMethods.GetPreviousFileName(function (result) {
oFilename = result;
});
});
function checkDuplicateFile() {
var newVal = $('#<%=fu.ClientID %>').val();
var newValFile = newVal.substr(newVal.lastIndexOf("\\") + 1);
//returning true causes postback, returning false stops postback.
if (newValFile == oFilename) { return confirm("This image name already exists, do you want to replace it?"); }
else return true;
}
</script>
Couple of things going on here. We use our pagemethod to pull in our old filename from the page method on page load (PageMethods.GetPreviousFileName). Next we setup the function which will be called by our buttons onClick event (client side). The <%=fu.ClientID %> snippet of code will output the client side id of the file upload control for use in our javascript. I do a substring on the file path and extract the file name by pulling back only the text after the last '\' and do the compare.
As my comment in the function says, returning true/false from a function called in the OnClientclick event determines whether a post back occurs. So if the user clicks yes in the confirmation box then a postback occurs, else if they click no then none occurs.
Hope that at least gets you going in the right direction.
Add the code below to your submit button
OnClientClick="return confirm('Are you sure you want to delete this file?')"
Edit as someone pointed out this will ask this question without taking in concern previous file and new one. It will do basic job.
My question is whether you doing this for edit mode or in new item mode. I mean are you editing item or adding new one on page you are interested to check?