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HOME > Javascript Tips & Tricks : การใช้งาน JavaScript ร่วมกับ Form > JavaScript isNaN() Check Number

JavaScript isNaN() Check Number

JavaScript isNaN() Check Number เป็นตัวอย่างการ JavaScript กับ isNaN() ในการตรวจสอบค่าตัวเลข Is Number

isNaN.html

<html>
<head>
<title>ThaiCreate.Com Tutorial</title>
</head>
<body>
<form name="frmMain" action="" method="post" OnSubmit="return chkSubmit();">
<script language="JavaScript">
	function chkSubmit()
	{
		 if(isNaN(document.frmMain.txtNumber.value))
		 {
			alert('Please input Number only.');
			return false;
		 }
	}
</script>
Input Number <input type="text" name="txtNumber" value="">
<input type="submit" name="btnSubmit" value="Submit">
</form>
</body>
</html>

Screenshot

JavaScript isNaN() Check Number

ช่วยกันสนับสนุนรักษาเว็บไซต์ความรู้แห่งนี้ไว้ด้วยการสนับสนุน Source Code 2.0 ของทีมงานไทยครีเอท

ลองใช้ค้นหาข้อมูล


	By :	ThaiCreate.Com Team (บทความเป็นลิขสิทธิ์ของเว็บไทยครีเอทห้ามนำเผยแพร่ ณ เว็บไซต์อื่น ๆ)
	Score Rating :
	Create/Update Date :	2011-06-19 09:17:09 / 2011-06-23 10:03:44
	Download :	No files

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