如何在JQuery $ .each循環中將鍵與字符串進行比較？

Question

我正在嘗試從自定義數據屬性JQuery非侵入式適配器中獲取錯誤消息，但似乎無法將錯誤消息提取到變量中。 我的驗證消息僅返回為：

警告：沒有為圖片定義消息

代碼如下：

$(document).ready(function () {
var errorMessage;
$.validator.unobtrusive.adapters.add(
    'filesize', ['maxsize'], function (options) {
        options.rules['filesize'] = options.params;

        if (options.message) {
            options.message['filesize'] = options.message;             

            $.each(options, function (key, val) {
                console.log("Key: " + key + " | Value: " + val);
                if (key === "message") {
                    errorMessage = val;
                }
            });

        }
    });

$.validator.addMethod('filesize', function (value, element, params) {
    if (element.files.length < 1) {
        // No files selected
        return true;
    }

    if (!element.files || !element.files[0].size) {
        // This browser doesn't support the HTML5 API
        return true;
    }

    return element.files[0].size < params.maxsize;
}, errorMessage); // This is where the variable errorMessage is used
});

另外，當我使用options.messages（復數）的正確JQuery語法並忽略整個$ .each塊時，當我打開Firebug時，Firefox崩潰了嗎？

Answer 1

通常，您需要在視圖模型上編寫的自定義驗證屬性中指定錯誤消息：

public class MyViewModel
{
    [Required]
    [MaxFileSize(8388608, ErrorMessage = "Maximum allowed file size is {0} bytes")]
    public HttpPostedFileBase File { get; set; }
}

然后具有自定義驗證屬性：

public class MaxFileSizeAttribute : ValidationAttribute, IClientValidatable
{
    private readonly int _maxFileSize;
    public MaxFileSizeAttribute(int maxFileSize)
    {
        _maxFileSize = maxFileSize;
    }

    public override bool IsValid(object value)
    {
        var file = value as HttpPostedFileBase;
        if (file == null)
        {
            return false;
        }
        return file.ContentLength <= _maxFileSize;
    }

    public override string FormatErrorMessage(string name)
    {
        return base.FormatErrorMessage(_maxFileSize.ToString());
    }

    public IEnumerable<ModelClientValidationRule> GetClientValidationRules(ModelMetadata metadata, ControllerContext context)
    {
        var rule = new ModelClientValidationRule
        {
            ErrorMessage = FormatErrorMessage(_maxFileSize.ToString()),
            ValidationType = "filesize"
        };
        rule.ValidationParameters["maxsize"] = _maxFileSize;
        yield return rule;
    }
}

和不打擾的適配器：

jQuery.validator.unobtrusive.adapters.add(
    'filesize', [ 'maxsize' ], function (options) {
        options.rules['filesize'] = options.params;
        if (options.message) {
            options.messages['filesize'] = options.message;
        }
    }
);

jQuery.validator.addMethod('filesize', function (value, element, params) {
    if (element.files.length < 1) {
        // No files selected
        return true;
    }

    if (!element.files || !element.files[0].size) {
        // This browser doesn't support the HTML5 API
        return true;
    }

    return element.files[0].size < params.maxsize;
}, '');

Answer 2

要將鍵與$。字符串進行比較，您只需執行以下操作

var myObj = {'message1' : 1, 'message2' : 2};
$.each(​myObj, function(key){
     if(key == 'message1'){
         alert('they match!');                     
     }                                
});​