jQuery验证大于和小于

Question

如何确保用户无法输入小于或大于特定值的值？

问题在于验证字段的值小于或大于另一字段。

Answer 1

$(document).ready 
(
    function() 
    { 
     $.validator.addMethod(
     "greaterThan", 
     function (value, element, param) 
     { 
      // bind to the blur event of the target in order to revalidate whenever the target field is updated    
      var target = $(param) 
      .unbind(".validate-greaterThan") 
      .bind 
      (
       "blur.validate-greaterThan", 
       function() 
       { 
        $(element).valid(); 
       } 
      ); 
      return parseFloat(value) >= parseFloat(target.val()); 
     }, 
     "Pretul trebuie sa fie mai mare decat valoarea initiala" 
     ); 
    } 
); 



$('#gvProduseList input[name$=Pret]').each 
    (
     function (index, domEle) 
     { 
      $(this).rules 
      (
       "add" 
       , { 

        required: true, 
        minlength: 1, 
        range: [0.1, Number.MAX_VALUE], 
        greaterThan: '#Produse_' + index + '__PretIntrare', 
        messages: 
        { 
         required: "Pretul este necesar!", 
         minlength: "Pretul este necesar!", 
         range: "Pretul este necesar!", 
         greaterThan: "Pretul trebuie sa fie mai mare decat " + $('#Produse_' + index + '__PretIntrare').val() 
        } 
       } 
      ); 
     } 
    ); 




$(document).ready 
(
    function() 
    { 
     $.validator.addMethod(
     "lessThan", 
     function (value, element, param) 
     { 
      // bind to the blur event of the target in order to revalidate whenever the target field is updated    
      var target = $(param) 
      .unbind(".validate-lessThan") 
      .bind 
      (
       "blur.validate-lessThan", 
       function() 
       { 
        $(element).valid(); 
       } 
      ); 
      return parseFloat(value) <= parseFloat(target.val()); 
     }, 
     "Valoarea trebuie sa fie mai mica sau egala decat valoarea initiala" 
     ); 
    } 
); 


$('#gvListDetaliiElemTranAdaugare input[name$=Valoare]').each 
    (
     function (index, domEle) 
     { 
      $(this).rules 
      (
       "add" 
       , { 

        required: true, 
        minlength: 1, 
        range: [0.1, Number.MAX_VALUE], 
        lessThan: '#ListaDetaliiElemTranModelAdaugare_' + index + '__ValoareRamasa', 
        messages: 
        { 
         required: "Valoarea este necesara!", 
         minlength: "Valoarea este necesara!", 
         range: "Valoarea este necesara!", 
         lessThan: "Valoarea trebuie sa fie mai mica sau egala cu " + $('#ListaDetaliiElemTranModelAdaugare_' + index + '__ValoareRamasa').val() 


        } 
       } 
      ); 
     } 
    ); 

Answer 2

如果您正在使用jquery.validation插件这里的GREATERTHAN方法

$.validator.addMethod(
"greaterThan", 
function(value, element, params) { 
    var target = $(params[0]).val(); 
    var isValueNumeric = !isNaN(parseFloat(value)) && isFinite(value); 
    var isTargetNumeric = !isNaN(parseFloat(target)) && isFinite(target); 
    if (isValueNumeric && isTargetNumeric) { 
     return Number(value) > Number(target); 
    } 

    if (!/Invalid|NaN/.test(new Date(value))) { 
     return new Date(value) > new Date(target); 
    } 

    return false; 
}, 
'Must be greater than {1}.');