验证多行文本框 [英] validation for multiline textbox
本文介绍了验证多行文本框的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
多行文本框仅接受数字值.例如，多行文本框中不允许使用char.
解决方案
<html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <title>Untitled Document</title> <script type="text/javascript"> 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); } </script> </head> <body> <input type="text" onkeypress="return blockNonNumbers(this, event, true, false);" /> </body> </html>
multiline text box accept numeric values only.eg.char not allowed in multiline textbox.
解决方案
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Untitled Document</title>
<script type="text/javascript">
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);
}
</script>
</head>
<body>
<input type="text" onkeypress="return blockNonNumbers(this, event, true, false);" />
</body>
</html>这篇关于验证多行文本框的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
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