嗨,以下是我的登录表单,因为我想限制用户在用户名字段中输入 8 个字符,但它不起作用以下是我的代码:
<div data-role="content">
<form id="loginForm">
<div data-role="fieldcontain" class="ui-field-contain ui-body ui-br">
<label for="username">Username:</label> <input type="text"
name="username" id="username" value="" maxlength="8" /> <label for="password">Password:</label>
<input type="password" name="password" id="password" value="" /> <label
for="dob">Date of birth:</label> <input type="password"
type="password" name="dob" id="dob" value="" />
</div>
<div >
<fieldset class="ui-grid-a" >
<div class="ui-block-a" >
<input type="submit" data-role="button" value="Login"
id="submitButton">
</div>
<div class="ui-block-b">
<input type="reset" data-role="button" value="Cancel"
id="cancelButton">
</div>
</fieldset>
</div>
</form>
</div>
<script type="text/javascript">
</script>
<script type="text/javascript">
$("#username").live('keydown', function (event)
{
if ((event.keyCode.length>8))
{
event.preventDefault();
}
});
</script>
但用户仍然可以在 UserName 字段中输入任意数量的字符。这段代码有什么问题?任何建议将不胜感激。提前致谢