javascript 如何使用 jquery 验证器来确定一个字段的值大于另一个字段?

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时间:2020-10-28 10:33:42  来源:igfitidea点击:

how to use jquery validator to determine value of one field is greater than another field?

javascriptjquery

提问by rrgirish

I have two fields in a form and I want to add a rule for them saying that id2 cannot have value less than id1

我在一个表单中有两个字段,我想为他们添加一条规则,说明 id2 的值不能小于 id1

 <input type="text" id="id1">
 <input type="text" id="id2">


id1 : {
                number: true,
                min: 0
            }, 
id2 : {
                number: true,
                min: 0
            } 

Is there a way to set the rule for the jquery validator?

有没有办法为 jquery 验证器设置规则?

回答by denat

Add a custom method:

添加自定义方法:

$.validator.addMethod("greaterThan",
    function (value, element, param) {
          var $otherElement = $(param);
          return parseInt(value, 10) > parseInt($otherElement.val(), 10);
    });
);

The above code assumes you are using integers. If not, replace parseIntwith parseFloat.

上面的代码假设您使用的是整数。如果没有,请替换parseIntparseFloat

Then use it this way in your configuration:

然后在您的配置中以这种方式使用它:

id2: {
    number: true,
    min: 0,
    greaterThan: "#id1"
}

回答by callback

You can have the desired behavior with jQuery using the following :

您可以使用以下 jQuery 获得所需的行为:

HTML

HTML

 <input type="text" id="id1">
 <input type="text" id="id2">
 <input type="submit" id="submit">
 <div class="error" style="display:none">id2 cannot have value less than id1<div>

jQuery

jQuery

$("#id2").focusout(function(){

    if(parseFloat($("#id1").val()) > parseFloat($("#id2").val()))
    {
        $(".error").css("display","block").css("color","red");
        $("#submit").prop('disabled',true);
    }
    else {
        $(".error").css("display","none");
        $("#submit").prop('disabled',false);        
    }

});

See the jfiddle : http://jsfiddle.net/fyrgazfg/

请参阅 jfiddle:http: //jsfiddle.net/fyrgazfg/