Blog Information: Javascript allow textbox accept numbers and 2 decimal points only

Sabtu, 11 Januari 2014

Javascript allow textbox accept numbers and 2 decimal points only

ylliX - Online Advertising Network

<script type="text/javascript">// price text-box allow numeric and allow 2 decimal points only function extractNumber(obj, decimalPlaces, allowNegative) { 	var temp = obj.value; 	 	// avoid changing things if already formatted correctly 	var reg0Str = [0-9]*; 	if (decimalPlaces > 0) { 		reg0Str += \.?[0-9]{0, + decimalPlaces + }; 	} else if (decimalPlaces < 0) { 		reg0Str += \.?[0-9]*; 	} 	reg0Str = allowNegative ? ^-? + reg0Str : ^ + reg0Str; 	reg0Str = reg0Str + $; 	var reg0 = new RegExp(reg0Str); 	if (reg0.test(temp)) return true;  	// first replace all non numbers 	var reg1Str = [^0-9 + (decimalPlaces != 0 ? . : ) + (allowNegative ? - : ) + ]; 	var reg1 = new RegExp(reg1Str, g); 	temp = temp.replace(reg1, );  	if (allowNegative) { 		// replace extra negative 		var hasNegative = temp.length > 0 && temp.charAt(0) == -; 		var reg2 = /-/g; 		temp = temp.replace(reg2, ); 		if (hasNegative) temp = - + temp; 	} 	 	if (decimalPlaces != 0) { 		var reg3 = /./g; 		var reg3Array = reg3.exec(temp); 		if (reg3Array != null) { 			// keep only first occurrence of . 			//  and the number of places specified by decimalPlaces or the entire string if decimalPlaces < 0 			var reg3Right = temp.substring(reg3Array.index + reg3Array[0].length); 			reg3Right = reg3Right.replace(reg3, ); 			reg3Right = decimalPlaces > 0 ? reg3Right.substring(0, decimalPlaces) : reg3Right; 			temp = temp.substring(0,reg3Array.index) + . + reg3Right; 		} 	} 	 	obj.value = temp; } function blockNonNumbers(obj, e, allowDecimal, allowNegative) { 	var key; 	var isCtrl = false; 	var keychar; 	var reg; 		 	if(window.event) { 		key = e.keyCode; 		isCtrl = window.event.ctrlKey 	} 	else if(e.which) { 		key = e.which; 		isCtrl = e.ctrlKey; 	} 	 	if (isNaN(key)) return true; 	 	keychar = String.fromCharCode(key); 	 	// check for backspace or delete, or if Ctrl was pressed 	if (key == 8 || isCtrl) 	{ 		return true; 	}  	reg = /d/; 	var isFirstN = allowNegative ? keychar == - && obj.value.indexOf(-) == -1 : false; 	var isFirstD = allowDecimal ? keychar == . && obj.value.indexOf(.) == -1 : false; 	 	return isFirstN || isFirstD || reg.test(keychar); } // end of price text-box allow numeric and allow 2 decimal points only </script>  <input type="text" name="price" value="" size="10" onblur="extractNumber(this,2,false);" onkeyup="extractNumber(this,2,false);" onkeypress="return blockNonNumbers(this, event, true, false);" />

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