Data Validation via an onChange event Handler : TextField « Form Control « JavaScript DHTML






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Data Validation via an onChange event Handler

 <HTML> <HEAD> <TITLE>Text Object Select/Focus</TITLE> <SCRIPT LANGUAGE="JavaScript"> function isNumber(inputStr) { for (var i = 0; i < inputStr.length; i++) { var oneChar = inputStr.substring(i, i + 1) if (oneChar < "0" || oneChar > "9") { alert("Please make sure entries are numbers only.") return false } } return true } function checkIt(form) { inputStr = form.numeric.value if (isNumber(inputStr)) { // statements if true  } else { form.numeric.focus() form.numeric.select() } } </SCRIPT> </HEAD> <BODY onSubmit="checkIt(this); return false"> <FORM> Enter any positive integer: <INPUT TYPE="text" NAME="numeric" onChange="checkIt(this.form)"><P> </FORM> </BODY> </HTML>








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