Question

如果#category字段为空，我正在尝试下拉列表。

谢谢！

JQUERY ATTEMPT＃1：

$("#uploadDocsForm").validate({
    rules: {
        name: {
            required: true,
            minlength: 2,
            maxlength: 255  
        },
        cat_id: {
            required: function(element) {
                return $("#category").val() == '';
            }
        }
    },
    messages: {
        name: 'Please enter a <b>Document Name</b>.',
        cat_id: 'Please select a <b>Category</b>.'
    }
});

JQUERY ATTEMPT＃2：

$("#uploadDocsForm").validate({
    rules: {
        name: {
            required: true,
            minlength: 2,
            maxlength: 255  
        },
        cat_id: {
            required: {
                depends: function(element) {
                    return $("#category").val() == '';
                }
            }
        }
    },
    messages: {
        name: 'Please enter a <b>Document Name</b>.',
        cat_id: 'Please select a <b>Category</b>.'
    }
});

HTML：

<form name="uploadDocsForm" id="uploadDocsForm">   
    <label for="name">Document Name</label>
    <input name="name" id="name" type="text" class="textbox"/>
    <label for="cat_id">Category</label>
    <select name="cat_id" id="cat_id" class="dropdown">
    <option selected>Please Select Category</option>
    <option>------------------------</option>
    <option value="1">test cat</option>
    </select>
    <label for="category">New Category</label>
    <input name="category" id="category" type="text" class="textbox"/>
    </form>

Answer 1

$("#uploadDocsForm").validate({
    rules: {
        name: {
            required: true,
            minlength: 2,
            maxlength: 255  
        },
        cat_id: {
            required: {
                depends: function(element) {
                    return $("#category").val() == '';
                }
            }
        }
    },
    messages: {
        name: 'Please enter a <b>Document Name</b>.',
        cat_id: 'Please select a <b>Category</b>.'
    }
});

depends函数现在检查是否填充了category元素，如果是，则需要第二个元素。否则它是可选的（意思是可以填充）。

用例：

类别已填充，cat_id为空：无效
类别已填写，cat_id已填写：有效
类别为空，cat_id为空：有效
类别为空，cat_id已填充：有效

Answer 2

我似乎不再支持'依赖'了。

我使用了以下内容并且有效：

<form name="uploadDocsForm" id="uploadDocsForm">   
    <label for="name">Document Name</label>
    <input name="name" id="name" type="text" class="textbox"/>
    <label for="cat_id">Category</label>
    <select name="cat_id" id="cat_id" class="dropdown">
    <option value="" selected>Please Select Category</option>
    <option>------------------------</option>
    <option value="1">test cat</option>
    </select>
    <label for="category">New Category</label>
    <input name="category" id="category" type="text" class="textbox"/>
    </form>

注意选项值=“”会导致验证失败，因为val为空

$("#uploadDocsForm").validate({
    rules: {
        name: {
            required: true,
            minlength: 2,
            maxlength: 255  
        },
        cat_id: {
            required: true
            }
        }
    },
    messages: {
        name: 'Please enter a <b>Document Name</b>.',
        cat_id: 'Please select a <b>Category</b>.'
    }
});

如果字段为空，则需要Jquery验证下拉列表

2 个答案: