javascript - jQuery 验证依赖表达式

Question

我正在尝试设置 jQuery Validate依赖表达式，以便用户需要使用文本字段或上传文件，但此代码不起作用：这两个字段始终是必需的。我猜<input type="file">不支持#id:empty，但我可以用什么代替它？

这是一个jsFiddle。

Javascript：

jQuery(document).ready(function() {
    jQuery("#form1iienom").validate({
        errorClass:"errorlabels",
        rules: {
            form1apptext: {
                required: "#form1upload:empty"
            },
            form1upload: {
                required: "#form1apptext:empty",
                extension: "jpg|jpeg|pdf|png|doc|docx"
            },
        },
        messages: {
            form1apptext: "You must either enter a reason for your nomination or upload a file.",
            form1upload: {
                required: "You must either enter a reason for your nomination or upload a file.",
            },
        }
    });
});

HTML：

<form name="form1iienom" id="form1iienom" method="post" action="/applications/iie/review" enctype="multipart/form-data">
<textarea name="form1apptext" id="form1apptext"></textarea><br />
<br />
<em>(allowed file types are jpg, jpeg, pdf, png, doc, and docx; maximum file size is 3 MB)</em>
<input type="hidden" name="MAX_FILE_SIZE" value="3145728" />
<input type="file" name="form1upload" id="form1upload" /><br />
<input type="submit" value="Submit" />
</form>

Answer 1

根据文档，正确的选择器是:blank，不是:empty。

另请参阅示例，根据文档，使用depends子规则...

rules: {
    contact: {
        required: true,
        email: {
            depends: function(element) {
                return $("#contactform_email:checked")
            }
        }
    }
}