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POMVC custom validation: compare two dates
 

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  1. POMVC custom validation: compare two dates
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    <p>I've created a custom ValidationAttribute that compares 2 dates and makes sure that the second date is greater than the first:</p> <pre><code>public sealed class IsDateAfter : ValidationAttribute, IClientValidatable { private readonly string testedPropertyName; private readonly bool allowEqualDates; public IsDateAfter(string testedPropertyName, bool allowEqualDates = false) { this.testedPropertyName = testedPropertyName; this.allowEqualDates = allowEqualDates; } protected override ValidationResult IsValid(object value, ValidationContext validationContext) { var propertyTestedInfo = validationContext.ObjectType.GetProperty(this.testedPropertyName); if (propertyTestedInfo == null) { return new ValidationResult(string.Format("unknown property {0}", this.testedPropertyName)); } var propertyTestedValue = propertyTestedInfo.GetValue(validationContext.ObjectInstance, null); if (value == null || !(value is DateTime)) { return ValidationResult.Success; } if (propertyTestedValue == null || !(propertyTestedValue is DateTime)) { return ValidationResult.Success; } // Compare values if ((DateTime)value &gt;= (DateTime)propertyTestedValue) { if (this.allowEqualDates) { return ValidationResult.Success; } if ((DateTime)value &gt; (DateTime)propertyTestedValue) { return ValidationResult.Success; } } return new ValidationResult(FormatErrorMessage(validationContext.DisplayName)); } public IEnumerable&lt;ModelClientValidationRule&gt; GetClientValidationRules(ModelMetadata metadata, ControllerContext context) { var rule = new ModelClientValidationRule { ErrorMessage = this.ErrorMessageString, ValidationType = "isdateafter" }; rule.ValidationParameters["propertytested"] = this.testedPropertyName; rule.ValidationParameters["allowequaldates"] = this.allowEqualDates; yield return rule; } </code></pre> <p>CalendarEntry class: ...</p> <pre><code>public virtual DateTime StartDate { get; set; } [IsDateAfter("StartDate", true, ErrorMessage="End date needs to be after start date")] public virtual DateTime EndDate { get; set; } </code></pre> <p>VIEW:</p> <pre><code>$.validator.unobtrusive.adapters.add( 'isdateafter', ['propertytested', 'allowequaldates'], function (options) { options.rules['isdateafter'] = options.params; options.messages['isdateafter'] = options.message; }); $.validator.addMethod("isdateafter", function(value, element, params) { alert(params.propertytested); var startdatevalue = $('input[name="' + params.propertytested + '"]').val(); if (!value || !startdatevalue) return true; return (params.allowequaldates) ? Date.parse(startdatevalue) &lt;= Date.parse(value) : Date.parse(startdatevalue) &lt; Date.parse(value); }, ''); </code></pre> <p>This works fine when the <strong>CalendarEntry</strong> is not wrapped inside another class. HOWEVER, when I use a view model like so:</p> <pre><code> public class TrainingDateEditViewModel { #region Properties /// &lt;summary&gt; /// Gets or sets CalendarEntry. /// &lt;/summary&gt; public CalendarEntry CalendarEntry { get; set; } .... </code></pre> <p>The client validation no longer works because the html output produced is this:</p> <pre><code>&lt;input type="text" value="" name="CalendarEntry.EndDate" id="CalendarEntry_EndDate" data-val-isdateafter-propertytested="StartDate" data-val-isdateafter-allowequaldates="True" data-val-isdateafter="End date needs to be after start date" data-val="true"&gt; </code></pre> <p>And the </p> <pre><code>data-val-isdateafter-propertytested="StartDate" and IT SHOULD BE: "CalendarEntry.StartDate". </code></pre> <p>How would I make it so that it would know to bind to "CalendarEntry.StartDate" rule.ValidationParameters["propertytested"] = this.testedPropertyName; // HERE IT SHOULD BE FULL NAME??? HOW??</p> <p>thanks</p>
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    1. COthank you for this code, I've successfully implemented it in my validation
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      1. USSam
    2. COThank you as well, for this, and @counsellorben for the update.
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      1. USAndrew Backer
    3. COMight be a good idea to Suffix your class with `Attribute`
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      1. USLiam
 

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