Forgot Password ??

PHP , ASP , ASP.NET, VB.NET, C#, Java , jQuery , Android , iOS , Windows Phone

	Registered : 109,037

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

Sponsored Links / Related

JavaScript Submit & Button
Rating :

JavaScript alert & confirm
Rating :

JavaScript HTML Submit Form
Rating :

JavaScript Keyboard & Event
Rating :

JavaScript HTML Multiple Action Form
Rating :

JavaScript innerHTML & InnerText
Rating :

JavaScript HTML Check Input TextBox/Text Field
Rating :

JavaScript Check Password / Confirm Password
Rating :

JavaScript HTML Check Checkbox
Rating :

JavaScript HTML Check Radio Button
Rating :

JavaScript HTML Back/Next/Close/Print
Rating :

JavaScript HTML Disable & Enable Html Element
Rating :

JavaScript HTML Show/Hide Html Element
Rating :

JavaScript Auto Print Preview
Rating :

JavaScript Reload/Refresh Webpage
Rating :

JavaScript Auto Redirect
Rating :

JavaScript Timers Delay setTimeout
Rating :

HTML Redirect / Refresh Webpage
Rating :

JavaScript Click Check All and Un Check All
Rating :

JavaScript & AJAX
Rating :

JavaScript Cookies
Rating :

JavaScript Prompt
Rating :

JavaScript Disabled Element
Rating :

JavaScript Display Element
Rating :

JavaScript Visibility & Display
Rating :

JavaScript Check Validate Number only input
Rating :

JavaScript Check Event Key Codes / Keyboard
Rating :

JavaScript Disable Enter Submit Form
Rating :

JavaScript Disable IE (Internet Explorer) Close Button.
Rating :

JavaScript Print Webpage and Using CSS
Rating :

JavaScript Sum Total Value From Textbox
Rating :

JavaScript Change Display Image from JavaScript
Rating :

JavaScript/jQuery Display Preview Images Before Upload
Rating :

JavaScript Add/Remove Item in ListMenu/DropDownList
Rating :

JavaScript substring
Rating :

JavaScript split
Rating :

JavaScript trim
Rating :

JavaScript Count String Length
Rating :

JavaScript Change Textbox Stylesheet / CSS
Rating :

JavaScript Get/Read all element on Webpage
Rating :

JavaScript Popup Window
Rating :

JavaScript Display Full Screen WebPage
Rating :

Javascript Enter and AutoFocus Next Textbox (Up and Down Keyword)
Rating :

JavaScript Disable Right-Click
Rating :

JavaScript Disable Text Selection on Webpage When Drag-and-Drop
Rating :

JavaScript Auto Select Text When Click TextBox
Rating :

JavaScript Auto Clear Text When Click TextBox
Rating :

JavaScript Create Cookies , Read Cookies , Delete Cookies
Rating :

JavaScript createElement or element control
Rating :

JavaScript Get a Screen Resolution Detection
Rating :

JavaScript: Check File Extension Before Upload
Rating :

JavaScript createElement Without Array
Rating :

JavaScript createElement and Create DropDownList/ListMenu
Rating :

JavaScript createElement Select and Get item from MySql Database
Rating :

JavaScript Change Display Image When MouseOver
Rating :

JavaScript Dependency Dependant and MySQL Database
Rating :

JavaScript Click Checkbox and Highlight Background Color table
Rating :

JavaScript Mark all the Checkbox and Background Color the Table After Checked Checkbox
Rating :

JavaScript When Cell Click Highlight BackGround Color , BgColor in a Table
Rating :

Javascript Table Cell Highlight Background Colors Change on Mouseover
Rating :

JavaScript Get element with array
Rating :

JavaScript Dynamic Dependant DropDownList/ListMenu
Rating :

JavaScript Send Data from Popup to Main form
Rating :

JavaScript Send Checkbox Data from Popup to Main form
Rating :

JavaScript isNaN() Check Number
Rating :

JavaScript ParseFloat() Convert String to Number
Rating :

JavaScript ParseInt() Convert String to Integer
Rating :

JavaScript Ceil() Round fractions up
Rating :

JavaScript toFixed() Formatting numbers for currency
Rating :

JavaScript toExponential() Converts to exponential notation.
Rating :

JavaScript toPrecision() Formats Specified length
Rating :

JavaScript valueOf()
Rating :

JavaScript toUpperCase() Convert Uppercase String
Rating :

JavaScript toLowerCase() Convert Lower String
Rating :

JavaScript substr() Sub String
Rating :

JavaScript toString() Convert to String
Rating :

JavaScript Number Format and Comma
Rating :

JavaScript replace() Replace string
Rating :

JavaScript random() Random number
Rating :

JavaScript round() Round Nearest integer
Rating :

JavaScript DateAdd() AddDay , AddMonth , AddYear
Rating :

JavaScript DateDiff() Calculating the difference date time
Rating :

JavaScript TimeDiff() Calculating the difference time
Rating :

JavaScript MonthDiff() Calculating the difference month from two date time
Rating :

JavaScript Compare DateTime to compare difference
Rating :

JavaScript Date() Day , Month , Year , Second , Minutes , Hours
Rating :

JavaScript Get Selection Text from DropDownList/ListMenu
Rating :

JavaScript Check and Detection Web Browser
Rating :

Javascript Disable Enter Submit and Backspace on KeyPress
Rating :

JavaScript Creating Add to Favorites Button
Rating :

JavaScript Show and Hide Table Rows
Rating :

JavaScript Create/Remove/Delete Dynamic Table Rows
Rating :

JavaScript setTimeOut & Loop
Rating :

JavaScript Text Box Characters Counter
Rating :

JavaScript Fixed Size and Get Size in HTML Element
Rating :

JavaScript Redirect/Redirection Web Page
Rating :

JavaScript get offsetWidth and offsetHeight
Rating :

JavaScript Input type file: Changing browse button
Rating :

JavaScript Move Maximize Window From JavaScript
Rating :

JavaScript visibility hidden & visible
Rating :

CSS Page Break on Printing
Rating :

สอน Windows Phone การเขียนโปรแกรม Windows Phone 7 และ 8

สอน Java GUI การเขียนโปรแกรม ภาษา Java GUI

Free Tutorial

	สอน Google Maps Api
	สอน Windows Service
	สอน Entity Framework
	สอน Android
	สอน Java เขียน Java
	Java GUI Swing
	สอน JSP (Web App)
	iOS (iPhone,iPad)
	Windows Phone
	Windows Azure
	Windows Store
	Laravel Framework
	Yii PHP Framework
	สอน jQuery
	สอน jQuery กับ Ajax
	สอน PHP OOP (Vdo)
	Ajax Tutorials
	SQL Tutorials
	สอน SQL (Part 2)
	JavaScript Tutorial
	Javascript Tips
	VBScript Tutorial
	VBScript Validation
	Microsoft Access
	MySQL Tutorials
	-- Stored Procedure
	MariaDB Database
	SQL Server Tutorial
	SQL Server 2005
	SQL Server 2008
	SQL Server 2012
	-- Stored Procedure
	Oracle Database
	-- Stored Procedure
	SVN (Subversion)
	แนวทางการทำ SEO
	ปรับแต่งเว็บให้โหลดเร็ว