Jquery验证规则取决于生成未捕获的TypeError

Question

当我尝试使用jQuery验证规则时，依赖如下：

<script>
$('#sign-up-form form').validate({
    rules: {
        state: "required",
        school: {
            depends: function(element) {
                return $("#id_school_id").val().length;
                }
            }
    }
});
</script>

每次依赖规则的部分运行我都会得到 Uncaught TypeError: Cannot read property 'call' of undefined

我正在检查的ID（#id_school_id）。 我使用的是jquery.validation.js v 1.11.1

Answer 1

我误解了取决于规则方法。您需要将其值应用于规则方法。所以，例如

$('#sign-up-form form').validate({
rules: {
    state: "required",
    school: {
        required: {
            depends: function(element) {
                return $("#id_school_id").val().length;
            }
        }
    }
},
messages: {
    school: "Please choose a valid school name from the choices presented"
}
});

</script>

该领域＆＃39;学校＆＃39;需要取决于字段＆＃39; school_id＆＃39;有一个长度。