jQuery Validate插件 - 如何创建简单的自定义规则？

Question

如何使用addMethod不使用正则表达式的jQuery Validate插件(使用)创建简单的自定义规则？

例如,只有在检查了一组复选框中的至少一个复选框时,哪个函数才会创建一个验证规则？

Answer 1

您可以通过执行以下操作来创建简单规则:

jQuery.validator.addMethod("greaterThanZero", function(value, element) {
    return this.optional(element) || (parseFloat(value) > 0);
}, "* Amount must be greater than zero");

然后像这样应用:

$('validatorElement').validate({
    rules : {
        amount : { greaterThanZero : true }
    }
});

只需更改'addMethod'的内容即可验证您的复选框.

Answer 2

$(document).ready(function(){
    var response;
    $.validator.addMethod(
        "uniqueUserName", 
        function(value, element) {
            $.ajax({
                type: "POST",
                url: "http://"+location.host+"/checkUser.php",
                data: "checkUsername="+value,
                dataType:"html",
                success: function(msg)
                {
                    //If username exists, set response to true
                    response = ( msg == 'true' ) ? true : false;
                }
             });
            return response;
        },
        "Username is Already Taken"
    );

    $("#regFormPart1").validate({
        username: {
            required: true,
            minlength: 8,
            uniqueUserName: true
        },
        messages: {
            username: {
                required: "Username is required",
                minlength: "Username must be at least 8 characters",
                uniqueUserName: "This Username is taken already"
            }
        }
    });
});

Answer 3

// add a method. calls one built-in method, too.
jQuery.validator.addMethod("optdate", function(value, element) {
        return jQuery.validator.methods['date'].call(
            this,value,element
        )||value==("0000/00/00");
    }, "Please enter a valid date."
);

// connect it to a css class
jQuery.validator.addClassRules({
    optdate : { optdate : true }    
});

Answer 4

自定义规则和数据属性

您可以data使用语法创建自定义规则并使用该属性将其附加到元素data-rule-rulename="true";

因此,要检查是否选中了一组复选框中的至少一个:

数据规则oneormorechecked

<input type="checkbox" name="colours[]" value="red" data-rule-oneormorechecked="true" />

addMethod

$.validator.addMethod("oneormorechecked", function(value, element) {
   return $('input[name="' + element.name + '"]:checked').length > 0;
}, "Atleast 1 must be selected");

您还可以使用语法 覆盖规则的消息(即:必须选择Atleast 1)data-msg-rulename="my new message".

注意

如果您使用该data-rule-rulename方法,则需要确保规则名称全部为小写.这是因为jQuery验证函数dataRules适用.toLowerCase()于比较,HTML5规范不允许使用大写.

工作实例

$.validator.addMethod("oneormorechecked", function(value, element) {
  return $('input[name="' + element.name + '"]:checked').length > 0;
}, "Atleast 1 must be selected");

$('.validate').validate();

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery-validate/1.14.0/jquery.validate.min.js"></script>

<form class="validate">
    red<input type="checkbox" name="colours[]" value="red" data-rule-oneormorechecked="true" data-msg-oneormorechecked="Check one or more!" /><br/>
    blue<input type="checkbox" name="colours[]" value="blue" /><br/>
    green<input type="checkbox" name="colours[]" value="green" /><br/>
    <input type="submit" value="submit"/>
</form>

Answer 5

谢谢,它有效!

这是最终的代码:

$.validator.addMethod("greaterThanZero", function(value, element) {
    var the_list_array = $("#some_form .super_item:checked");
    return the_list_array.length > 0;
}, "* Please check at least one check box");

Answer 6

您可以添加如下自定义规则:

$.validator.addMethod(
    'booleanRequired',
    function (value, element, requiredValue) {
        return value === requiredValue;
    },
    'Please check your input.'
);

并像这样使用它:

PhoneToggle: {
    booleanRequired: 'on'
}        

希望这可以帮助