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HOME > Javascript Tips & Tricks : การใช้งาน JavaScript ร่วมกับ Form > Javascript Disable Backspace on KeyPress

Javascript Disable Backspace on KeyPress

Javascript Disable Backspace on KeyPress เป็นตัวอย่างการ JavaScript ป้องกันกดปุ่ม Backspace บน Keyboard

disable_backspace1.html

<html>
<head>
<title>ThaiCreate.Com Tutorial</title>
</head>
<body>
<form name="frmMain" action="" method="post">
<script language="JavaScript">
document.onkeydown = chkEvent 
var formInUse = false;
function chkEvent(e) {
	var keycode;
	if (window.event) keycode = window.event.keyCode; //*** for IE ***//
	else if (e) keycode = e.which; //*** for Firefox ***//
	if(keycode==8)
	{
		return false;
	}
}
</script>
Textbox 1 <input type="text" name="txt1" value=""> <br>
Textbox 2 <input type="text" name="txt2" value=""> <br>
Textbox 3 <input type="text" name="txt3" value=""><br>
<input type="submit" name="btnSubmit" value="Submit">
</form>
</body>
</html>

Screenshot

Javascript Disable Backspace on KeyPress

จากตัวอย่างที่ 1 จะเห็นว่ากรณีที่กดปุ่ม Backspace เพื่อลบข้อความใน Textbox จะไม่สามารถทำได้ แต่ตัวอย่างที่ 2 จะมีการเพิ่มเงื่อนไขให้สามารถลบข้อความใน Textbox ได้

disable_backspace2.html

<html>
<head>
<title>ThaiCreate.Com Tutorial</title>
</head>
<body>
<form name="frmMain" action="" method="post">
<script language="JavaScript">
document.onkeydown = chkEvent 
var formInUse = false;
function chkEvent(e) {
	var keycode;
	if (window.event) keycode = window.event.keyCode; //*** for IE ***//
	else if (e) keycode = e.which; //*** for Firefox ***//
	if(keycode==8 && formInUse==false)
	{
		return false;
	}
}
</script>
Textbox 1 <input type="text" name="txt1" onfocus="formInUse = true;" onblur="formInUse = false;" value=""> <br>
Textbox 2 <input type="text" name="txt2" onfocus="formInUse = true;" onblur="formInUse = false;" value=""> <br>
Textbox 3 <input type="text" name="txt3" onfocus="formInUse = true;" onblur="formInUse = false;" value=""><br>
<input type="submit" name="btnSubmit" value="Submit">
</form>
</body>
</html>

Screenshot

Javascript Disable Backspace on KeyPress

ช่วยกันสนับสนุนรักษาเว็บไซต์ความรู้แห่งนี้ไว้ด้วยการสนับสนุน Source Code 2.0 ของทีมงานไทยครีเอท

ลองใช้ค้นหาข้อมูล


	By :	ThaiCreate.Com Team (บทความเป็นลิขสิทธิ์ของเว็บไทยครีเอทห้ามนำเผยแพร่ ณ เว็บไซต์อื่น ๆ)
	Score Rating :
	Create/Update Date :	2011-06-19 10:49:33 / 2011-06-19 10:56:00
	Download :	No files

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