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HOME > Javascript Tips & Tricks : การใช้งาน JavaScript ร่วมกับ Form > JavaScript Text Box Characters Counter

JavaScript Text Box Characters Counter

JavaScript Text Box Characters Counter เป็นตัวอย่างการ JavaScript กับ Characters Counter ในการนับตัวอักษร ที่ได้ทำการ Key เข้าไปใน Textbox หรือ Textarea

characters_count1.html

<html>
<head>
<title>ThaiCreate.Com Tutorial</title>
</head>
<body>
<form name="frmMain" action="" method="post">
<script language="JavaScript">
	var myMsg="Welcome to ThaiCreate.Com";
	myMsg = myMsg.replace("ThaiCreate.Com","www.ThaiCreate.Com");
	document.write(myMsg);
	alert(myMsg);
</script>
</form>
</body>
</html>

Screenshot

JavaScript Text Box Characters Counter

ตัวอย่างที่ 2 สามารถ Limit จำนวนตัวอักษร

characters_count2.html

<html>
<head>
<title>ThaiCreate.Com Tutorial</title>
</head>
<body>
<script language="JavaScript"> 
 	 function CheckCount()
		 {
		 	var maxChar = 50;
			if(document.frmMain.txtDetail.value.length > maxChar)
			{
				return false;
			}
			else
			{
				document.frmMain.txtCount.value = document.frmMain.txtDetail.value.length;
			}
		 }
</script>
<body>
	<form name="frmMain" method="post">
			<textarea name="txtDetail" cols="40" rows="5" id="txtDetail" onKeyDown="return CheckCount()"></textarea>
			<br>
			<input name="txtCount" type="text" id="txtCount" value=""> 
	</form>
</body>
</html>

Screenshot

JavaScript Text Box Characters Counter

ช่วยกันสนับสนุนรักษาเว็บไซต์ความรู้แห่งนี้ไว้ด้วยการสนับสนุน Source Code 2.0 ของทีมงานไทยครีเอท

ลองใช้ค้นหาข้อมูล


	By :	ThaiCreate.Com Team (บทความเป็นลิขสิทธิ์ของเว็บไทยครีเอทห้ามนำเผยแพร่ ณ เว็บไซต์อื่น ๆ)
	Score Rating :
	Create/Update Date :	2011-06-19 11:54:26 / 2011-06-19 11:58:05
	Download :	No files

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