Question

如何仅在第一个字符中不允许-（连字符）？

<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
    <title>Remove Special Characters from the Textbox - Coding cluster</title>
    <script language="javascript" type="text/javascript">
        function deleteSpecialChar(txtName) {
            if (txtName.value != '' && txtName.value.match(/^[\w ]+$/) == null) 
            {
                txtName.value = txtName.value.replace(/[\W]/g, '');
            }
        }
    </script>
</head>
<body>
    <form id="form1" >
    <div>
        <input id="txtName"  type="text" onkeyup="javascript:deleteSpecialChar(this)" />

    </div>
    </form>
</body>
</html>

Answer 1

应该是：

txtName.value = txtName.value.replace(/^[\W]/, '');
                                       ^    ^
                                       |    |
                    replace by first char   |
                                            |
                                      global flag removed

要在此行上方的代码后面的文本中替换--：

txtName.value = txtName.value.replace(/\-+/g, '-');
                                         ^
                                         |
                                    means 1 or more occurrences

已更新fiddle。

如何不允许 - （连字符）只在第一个字符？

1 个答案: