Programming Forums > Application Development > C#

nez · Jul 1st, 2005, 9:50 AM

Hi all,
Im building my first small program in Visual C# 2005 express, you enter your name in a text box and press the ok button and it changes the value of a label so it shows "hello <name entered>", its all working fine, but i would like it to change the name of the labels when you press return in the text box but im not sure how to do it, any advise would be apreciated, thanks
Nez

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namespace WindowsApplication1
{
    public partial class Form1 : Form
    {
        string name;

        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            label2.Text = "Hello";
            label3.Text = name; 
        }

        private void textBox1_TextChanged(object sender, EventArgs e)
        {
            name = textBox1.Text;
        }
    }
}

n.b This is what i have so far, i tried using an if statement, but i couldnt quite get it right, im sure there must be some simple line or two i can put in the textbox1 section.

nnxion · Jul 1st, 2005, 10:53 AM

So do you want to put a focus on your button, so when you hit enter it presses the button?

nez · Jul 1st, 2005, 11:34 AM

i want it so that after typing in your name, if you press enter it preforms the same function as pressing the ok button.. example windows calculator, type '4','+' and '5' then press the enter key and it shows 6, rather than having to press the '=' button.

nez

hoffmandirt · Jul 1st, 2005, 2:58 PM

If you view the properties of your form, there is a property that is called "AcceptButton." Here you can select the button that you would like to be your accept button. This automatically ties the selected button event to the Enter key.

hoffmandirt · Jul 1st, 2005, 3:02 PM

Also for Asp.net you can use this JavaScript in your HTML source.

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<script language="JavaScript">
function onkey() 
{
	if (window.event.keyCode==13) 
	{
		Form1.BUTTON_ID_HERE.focus();
	}
}
</script>

Hope these help

Also do not for get to add the onKey() function to your body onkeydown event.
<body onkeydown="onkey();" ...

hoffmandirt · Jul 1st, 2005, 4:46 PM

Here is one more way to handle the enter key and any other key.

For this example I have one button on a form. The onclick event of the button is as follows:

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private void btnClickMe_Click(object sender, System.EventArgs e)
{
	MessageBox.Show("Hello World!");
}

This just displays a message box when the user clicks the button.

Now select the form and add this to the KeyUp event:

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private void Form1_KeyUp(object sender, System.Windows.Forms.KeyEventArgs e)
{
	if(e.KeyCode == Keys.Enter)
	{
		this.btnClickMe_Click(new System.Object(), System.EventArgs.Empty);
	}
}

Simple right? You can call any key that you would like here. Just replace Keys.Enter with whatever key you would like. Basically what happens is when the user presses the enter key, it calls btnClickMe's click event and passes a blank object and empty args. You can use this to fire an event from anywhere.

nez · Jul 1st, 2005, 6:06 PM

Thanks for your help Hoffmandirt, your first and third posts work perfectly for the form, but i want to have the return work in the text box, in the properties section the acceptbutton and kepup options are not there, i cannot find anything under the behaviour properties section that seems to give me that option.

nez

Dameon · Jul 1st, 2005, 6:21 PM

If you are using the form's events to capture keys there is a property that must be set to True so that the form catches keypresses even if a child control has focus. This property is KeyPreview.

http://msdn.microsoft.com/library/de...rtiesTopic.asp

nez · Jul 1st, 2005, 6:29 PM

Give that man a beer

THanks Dameon that has made my day

It works just like i wanted it to now

Cheers
nez

Jul 1st, 2005, 9:50 AM	#1
nez Programmer Join Date: May 2005 Location: Plymouth UK Posts: 34 Rep Power: 0	Simple c# question Hi all, Im building my first small program in Visual C# 2005 express, you enter your name in a text box and press the ok button and it changes the value of a label so it shows "hello <name entered>", its all working fine, but i would like it to change the name of the labels when you press return in the text box but im not sure how to do it, any advise would be apreciated, thanks Nez (Toggle Plain Text) namespace WindowsApplication1 { public partial class Form1 : Form { string name; public Form1() { InitializeComponent(); } private void button1_Click(object sender, EventArgs e) { label2.Text = "Hello"; label3.Text = name; } private void textBox1_TextChanged(object sender, EventArgs e) { name = textBox1.Text; } } } namespace WindowsApplication1 { public partial class Form1 : Form { string name; public Form1() { InitializeComponent(); } private void button1_Click(object sender, EventArgs e) { label2.Text = "Hello"; label3.Text = name; } private void textBox1_TextChanged(object sender, EventArgs e) { name = textBox1.Text; } } } n.b This is what i have so far, i tried using an if statement, but i couldnt quite get it right, im sure there must be some simple line or two i can put in the textbox1 section. __________________ atariboy.wordpress.com

Jul 1st, 2005, 10:53 AM	#2
nnxion Programming Guru Join Date: Jun 2005 Location: elemental plane Posts: 1,429 Rep Power: 5	So do you want to put a focus on your button, so when you hit enter it presses the button? __________________ "Employ your time in improving yourself by other men's writings, so that you shall gain easily what others have labored hard for." -- Socrates

Jul 1st, 2005, 11:34 AM	#3
nez Programmer Join Date: May 2005 Location: Plymouth UK Posts: 34 Rep Power: 0	i want it so that after typing in your name, if you press enter it preforms the same function as pressing the ok button.. example windows calculator, type '4','+' and '5' then press the enter key and it shows 6, rather than having to press the '=' button. nez __________________ atariboy.wordpress.com

Jul 1st, 2005, 3:02 PM	#5
hoffmandirt Hobbyist Programmer Join Date: Jul 2005 Location: PA Posts: 125 Rep Power: 4	Also for Asp.net you can use this JavaScript in your HTML source. (Toggle Plain Text) <script language="JavaScript"> function onkey() { if (window.event.keyCode==13) { Form1.BUTTON_ID_HERE.focus(); } } </script> <script language="JavaScript"> function onkey() { if (window.event.keyCode==13) { Form1.BUTTON_ID_HERE.focus(); } } </script> Hope these help Also do not for get to add the onKey() function to your body onkeydown event. <body onkeydown="onkey();" ...

Jul 1st, 2005, 4:46 PM	#6
hoffmandirt Hobbyist Programmer Join Date: Jul 2005 Location: PA Posts: 125 Rep Power: 4	One more way. Here is one more way to handle the enter key and any other key. For this example I have one button on a form. The onclick event of the button is as follows: (Toggle Plain Text) private void btnClickMe_Click(object sender, System.EventArgs e) { MessageBox.Show("Hello World!"); } private void btnClickMe_Click(object sender, System.EventArgs e) { MessageBox.Show("Hello World!"); } This just displays a message box when the user clicks the button. Now select the form and add this to the KeyUp event: (Toggle Plain Text) private void Form1_KeyUp(object sender, System.Windows.Forms.KeyEventArgs e) { if(e.KeyCode == Keys.Enter) { this.btnClickMe_Click(new System.Object(), System.EventArgs.Empty); } } private void Form1_KeyUp(object sender, System.Windows.Forms.KeyEventArgs e) { if(e.KeyCode == Keys.Enter) { this.btnClickMe_Click(new System.Object(), System.EventArgs.Empty); } } Simple right? You can call any key that you would like here. Just replace Keys.Enter with whatever key you would like. Basically what happens is when the user presses the enter key, it calls btnClickMe's click event and passes a blank object and empty args. You can use this to fire an event from anywhere.

Jul 1st, 2005, 2:58 PM	#4
hoffmandirt Hobbyist Programmer Join Date: Jul 2005 Location: PA Posts: 125 Rep Power: 4	If you view the properties of your form, there is a property that is called "AcceptButton." Here you can select the button that you would like to be your accept button. This automatically ties the selected button event to the Enter key.

Jul 1st, 2005, 6:06 PM	#7
nez Programmer Join Date: May 2005 Location: Plymouth UK Posts: 34 Rep Power: 0	Thanks for your help Hoffmandirt, your first and third posts work perfectly for the form, but i want to have the return work in the text box, in the properties section the acceptbutton and kepup options are not there, i cannot find anything under the behaviour properties section that seems to give me that option. nez __________________ atariboy.wordpress.com

Jul 1st, 2005, 6:21 PM	#8
Dameon Troll Join Date: Apr 2005 Location: Texas Posts: 732 Rep Power: 4	If you are using the form's events to capture keys there is a property that must be set to True so that the form catches keypresses even if a child control has focus. This property is KeyPreview. http://msdn.microsoft.com/library/de...rtiesTopic.asp __________________ MD5(sig) = bcef75433db02e9ad9bf81d6f7c5c270

Jul 1st, 2005, 6:29 PM	#9
nez Programmer Join Date: May 2005 Location: Plymouth UK Posts: 34 Rep Power: 0	Give that man a beer THanks Dameon that has made my day It works just like i wanted it to now Cheers nez __________________ atariboy.wordpress.com

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Programming Forums > Application Development > C#

Simple c# question