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HOME > Javascript Tips & Tricks : การใช้งาน JavaScript ร่วมกับ Form > JavaScript Sum Total Value From Textbox

JavaScript Sum Total Value From Textbox

JavaScript Sum Total Value From Textbox ตัวอย่างนี้จะเป็นการใช้ JavaScript กับ Sum Textbox คือการรวมค่า หรือ Sum ค่าตัวเลขระหว่าง Textbox

sumvalue_textbox1.html หลังจาก Input ทั้ง 2 ช่องแล้วค่อยทำการกดปุ่ม Sum

<html>
<head>
<title>ThaiCreate.Com Tutorial</title>
</head>
<body>
<form name="frmMain" action="" method="post">
<script language="JavaScript">
	function fncSum()
	{
		 if(isNaN(document.frmMain.txtNumberA.value) || document.frmMain.txtNumberA.value == "")
		 {
			alert('(Number A)Please input Number only.');
			document.frmMain.txtNumberA.focus();
			return;
		 }

		 if(isNaN(document.frmMain.txtNumberB.value) || document.frmMain.txtNumberB.value == "")
		 {
			alert('(Number B)Please input Number only.');
			document.frmMain.txtNumberB.focus();
			return;
		 }

		 document.frmMain.txtNumberC.value = parseFloat(document.frmMain.txtNumberA.value) + parseFloat(document.frmMain.txtNumberB.value);
	}
</script>
Number A <input type="text" name="txtNumberA" value=""> <br>
Number B <input type="text" name="txtNumberB" value=""> <br>
A + B  = <input type="text" name="txtNumberC" value=""><br>
<input type="button" name="btnSum" value="Sum" OnClick="fncSum();">
</form>
</body>
</html>

Screenshot

JavaScript Sum Total Value From Textbox

sumvalue_textbox2.html หลังจากที่ input ลงใน textbox จะทำการ sum ทันที

<html>
<head>
<title>ThaiCreate.Com Tutorial</title>
</head>
<body>
<form name="frmMain" action="" method="post">
<script language="JavaScript">
	function fncSum()
	{
		 if(isNaN(document.frmMain.txtNumberA.value) || document.frmMain.txtNumberA.value == "")
		 {
			alert('(Number A)Please input Number only.');
			document.frmMain.txtNumberA.focus();
			return;
		 }

		 if(isNaN(document.frmMain.txtNumberB.value) || document.frmMain.txtNumberB.value == "")
		 {
			alert('(Number B)Please input Number only.');
			document.frmMain.txtNumberB.focus();
			return;
		 }

		 document.frmMain.txtNumberC.value = parseFloat(document.frmMain.txtNumberA.value) + parseFloat(document.frmMain.txtNumberB.value);
	}
</script>
Number A <input type="text" name="txtNumberA" value="" OnChange="fncSum();"> <br>
Number B <input type="text" name="txtNumberB" value="" OnChange="fncSum();"> <br>
A + B  = <input type="text" name="txtNumberC" value=""><br>
</form>
</body>
</html>

Screenshot

JavaScript Sum Total Value From Textbox

ช่วยกันสนับสนุนรักษาเว็บไซต์ความรู้แห่งนี้ไว้ด้วยการสนับสนุน Source Code 2.0 ของทีมงานไทยครีเอท

ลองใช้ค้นหาข้อมูล


	By :	ThaiCreate.Com Team (บทความเป็นลิขสิทธิ์ของเว็บไทยครีเอทห้ามนำเผยแพร่ ณ เว็บไซต์อื่น ๆ)
	Score Rating :
	Create/Update Date :	2011-06-18 17:09:12 / 2011-06-18 17:14:04
	Download :	No files

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