我试图通过构造函数传递表单节点来验证表单。我知道使用 OO 有点过分,但这是一个请求。我有下面的代码,但是当我尝试提醒函数(表单)中文本框的值时,它们会以未定义的形式出现。
<SCRIPT LANGUAGE="JavaScript">
function Validator(fields) {
this.fields = fields;
}
Validator.prototype.validate = function (form) {
for (var i = 0, l = this.fields.length; i < l; i++) {
alert(this.fields[i].value);
if (this.fields[i].value == 0) {
alert("The field is empty");
return false;
}
}
}
var validator = new Validator(["username", "password"]);
function runValidate(form) {
validator.validate(form);
}
</SCRIPT>
</head>
<body>
<form NAME="AbbeyRoad">
<fieldset>
<legend>Please login</legend>
<div class="form-element">
<label for="username"><span class="shortkey">U</span>sername:</label>
<input type="text" name="username" id="username" accesskey="u">
</div>
<div class="form-element">
<label for="password"><span class="shortkey">P</span>assword:</label>
<input type="password" name="password" id="password" accesskey="p">
</div>
<input type="button" name="login" value="Login" id="login" onClick="runValidate(this.form)">
</fieldset>
</form>