I am having a problem with updating the text of my label. Not sure how do I go about doing this.
I have a label (lable1) and a text box (secondTextBox)and I have a tree view that the user needs to select items from. The process goes like this:
User selects an element in the tree view, label1 displays default text and secondTextBox appears. When the user changes the default text inside secondTextBox the text inside label1 should automatically update itself without the user pressing anything (bear in mind that I have about 45 nodes that needs this to be active, is there a quick way to do this or do I have to edit the code for the 45 nodes?).
So far I was able to do the first change, however whenever the user enters anything, the label doesn't update automatically, the user has to select something else from the tree view and goes back to the original selection for the text to update.
Here is my code so far:
namespace WindowsFormsApplication1
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
private void treeView1_AfterSelect(object sender, TreeViewEventArgs e)
{
if (treeView1.SelectedNode.FullPath == #"Node0/Node1")
{
label1.Text = String.Format("Whatever default text there is {0}"
textBox1.Text);
}
}
}
}
Here is the screen shot for when it is in default mode.
http://i.stack.imgur.com/0NOlP.jpg
Here is the screen shot for when I have entered text, but there is no change in the label box:
http://i.stack.imgur.com/3uX53.jpg
Thank you very much in advance.
It looks like you just need to add a TextChanged event handler to your textbox1 control. Try putting this in your Form1 constructor:
textBox1.TextChanged += new System.EventHandler(this.textBox1_TextChanged);
Next, add this method:
private void textBox1_TextChanged(object sender, EventArgs e)
{
label1.Text = String.Format("Whatever default text there is {0}", textBox1.Text)
}
If you want to update your label when the textbox change you should wire the TextChanged events of the textbox:
private void textBox1_TextChanged(object sender, EventArgs e)
{
label1.Text = String.Format("Whatever default text there is {0}", textBox1.Text);
}
Set the event using the Form Designer or dinamically when you load your form.
Related
Well, I'm making a chess game that's based on labels. I need to listen for label click, so when user clicks on an label, I get the name of label he clicked. I know I can do it for each label, but is there an universal event that would help me do the same thing for all of them in one event / loop?
Suppose you have taken 64 labels.
In windows form, on click event of Label1 you will write following code:
private void Label1_Click(object sender, EventArgs e)
{
var label = sender as Label;
MessageBox.Show(label.Name);
}
For remaining 63 Lables, In Design view, select all 63 lables by using Ctrl key --> Go to Property window --> Under Event option select Click option --> From dropdownlist select 'Label1_Click' option.
Just finish & run the application.
You can use a Panel
structure to group your labels and then call the desired event on that Panel, so it will trigger whenever you click one of it's elements.
Another solution would be to identify your label with the coordinates of the mouse click (the amount of code that requires depends how you placed them of course).
Like mentioned in the comments you can assign one event to all...
List<Label> lbls = this.Controls.OfType<Label>().ToList();
foreach (var lbl in lbls)
{
lbl.Click += lbl_Click;
}
void lbl_Click(object sender, EventArgs e)
{
Label lbl = sender as Label;
MessageBox.Show(lbl.Name);
}
You can assign these methods to every label you need to manage in the VS form designer (you go to events of controls, at the click line and select the method in the list instead of double click on it):
private void Label_Click(object sender, EventArgs e)
{
var nameLabel = ( sender as Label )?.Name ?? "Error";
// ...
}
private void Label_Enter(object sender, EventArgs e)
{
( sender as Label ).Cursor = Cursors.Hand;
}
private void Label_Leave(object sender, EventArgs e)
{
( sender as Label ).Cursor = Cursors.Default;
}
Cursor change added for convenience if you want.
If you want to dynamically assign events, you can use the #caner answer, and you can group all in a panel to parse Panel.Controls and assign event.
You can create a custom label class that inherits from Label. You can then subscribe to the Click event of the base class and do your thing.
public class MyLabel : Label
{
public MyLabel()
: base()
{
Click += ProcessClickEvent;
}
private void ProcessClickEvent(object sender, System.EventArgs e)
{
// Do what you want to do
}
}
I am relatively new to c# but I am currently creating a Windows Form that has an editor window. I'm struggling with the Paste button though as I have 2 textbox fields, one for the title of the note and one for the note itself. I'm wanting to be able to paste from the clipboard into either textbox.
I have tried using if statements based on noteText.Focused and titleText.Focused but obviously this doesn't work as the Paste button becomes focused as soon as you click it.
Any suggestions would be of great help.
Create a local variable and save last focused textBox in it.
//subscribe both textBoxes with same GotFocus event handler
textBox1.GotFocus += textBox_GotFocus;
textBox2.GotFocus += textBox_GotFocus;
//local variable
TextBox lastSelected;
//GotFocus
private void textBox_GotFocus(object sender, EventArgs e)
{
//save last Selected textBox
lastSelected = sender as TextBox;
}
private void button1_Click_1(object sender, EventArgs e)
{
//on click get value from clipboard
if(lastSelected != null)
lastSelected.Text = Clipboard.GetText();
}
I'm not sure what's going wrong but I can't select the Text of my TextBox in a dialog.
I added a FirstTimeLoadedHandler to Loaded in my view where I select the text:
public ParticipantView()
{
InitializeComponent();
Loaded += FirstTimeLoadedHandler;
}
private void FirstTimeLoadedHandler(object sender, RoutedEventArgs e)
{
SurnameBox.Focus();
Keyboard.Focus(SurnameBox);
SurnameBox.SelectAll();
}
However my textbox is in Keyboard-Focus, but not selected at all. I'm not sure why it's not working.
I thought it has something to do with my databinding but the data should be received before Loaded fires or am I wrong?
Your code would work fine with two small changes. The first is that obviously, selecting all on a TextBox that has no text in it will have no effect. Secondly, if you focus it after calling SelectAll, you'll have more luck. Try this:
private void FirstTimeLoadedHandler(object sender, RoutedEventArgs e)
{
SurnameBox.Text = "This text is selected";
SurnameBox.SelectAll();
Keyboard.Focus(SurnameBox);
}
I am trying to make the save button visible when text is entered into the text box by using the following code:
if (tbName.TextModified == true)
{
btnCTimetablesOk.Visible = true;
}
else
{
btnCTimetablesOk.Visible = false;
}
but it gives error at tbname.textmodified
is there any other way to visible the button when we enter the text in text box
this is error i am getting "the event textbox.textmodified can only appear on the left hand side of += or -="
Try using the textbox's Enter and Leave events to show/hide your button:
private void textBox1_Enter(object sender, System.EventArgs e)
{
btnCTimetablesOk.Visible = true;
}
private void textBox1_Leave(object sender, System.EventArgs e)
{
btnCTimetablesOk.Visible = false;
}
Then modify your textbox to use these new methods.
If I'm reading your text correctly, you want the save button to be visible when the textbox has text in it and invisible when the text box is blank. If that's the case, you can use the Leave event (which occurs when the textbox loses focus) and a simple if statement:
private void textBox1_Leave(object sender, System.EventArgs e)
{
if(textBox1.Text != "")
btnCTimetablesOk.Visible = true;
else
btnCTimetablesOk.Visible = false;
}
You can also put this conditional block in any other methods kicked off by events that change the text of the box.
Also, you might want to consider using Enabled instead of Visible, it'll leave the button on the form but will gray out the text and clicking will do nothing.
I'm going to take a stab in the dark here and assume that the button is related to the textbox and you probably want someone to be able to type something in the textbox then click the button. You probably don't want the user to have to type something, then tab out or click somewhere else to make the button visible then click the button.
tbName_TextChanged(object sender, EventArgs e)
{
btnCTimetablesOk.Visible = !String.IsNullOrEmpty(tbName.Text)
}
Btw you're getting that error because TextModified isn't a boolean property, it's an event, like TextChanged or Leave or Enter. You can assign an event handler to it but you can't just check it like that.
As an aside I personally hate systems hungarian for winforms controls. I'd much rather have a timetablesOkButton than a btnCTimeablesOK button. That way if you also have a timetablesNameTextBox you can see at a glance that the button and the textbox match. Of course it may not be up to you.
I have a combo box. It must display its content, when focused and its value changed as well.
I wrote this code in its Value Change event:
if(combo1.Focused)
combo1.DroppedDown=true;
But it doesn't work!
what's your solution?
What Event handler are you putting that code in? Assuming that you want to show the drop down when the user types in the edit box part of the combo just handle the TextChanged event and put that code inside there and it should work.
If I understand your requirement correctly, when the combobox gets focus you want the drop down list to show. That can be achieved as follows
private void Form1_Load(object sender, EventArgs e)
{
comboBox1.GotFocus += new EventHandler(comboBox1_GotFocus);
}
void comboBox1_GotFocus(object sender, EventArgs e)
{
comboBox1.DroppedDown = true;
}