对“标签输入”插件进行Jquery验证

HTML：

<form id="someForm" name="someForm" method="post">
    <input type="text" id="txt1" name="txt1"/>
    <input id="tagsx" name="tagsx" type="text" />
    <input id="dummy" name="dummy" type="text" /><!-- dummy text field -->
    <input type="submit" value="submit"/>
</form>

CSS：

/*To hide dummy text field*/
#dummy{
    visibility: hidden!Important;
    height:1px;
    width:1px;
}

JavaScript的：

$(document).ready(function () {

    $.validator.addMethod("checkTags",function(value) { //add custom method
        //Tags input plugin converts input into div having id #YOURINPUTID_tagsinput
        //Now you can count no of tags
        return ($("#tagsx_tagsinput").find(".tag").length > 0);
    });

    $("#someForm").validate( {
        rules: {
            txt1:"required",dummy:"checkTags"
        },messages: {
            txt1: "required",dummy: "required"
        }
    });

    $('#tagsx').tagsInput({
        width: 'auto',autocomplete_url: 'http://xoxco.com/projects/code/tagsinput/test/fake_json_endpoint.html' 
    });
});