jQuery-Validation-Engine - 验证文件MIME类型

Question

我想使用jQuery-Validation-Engine来验证文件输入的MIME类型.我怎么能这样做？

我的方法是这样的:

function checkMIME(field, rules, i, options){
    var file = $("#userfile")[0].files[0];
    var MimeFilter = /^(image\/bmp|image\/gif|image\/jpeg|image\/png|image\/tiff)$/i;
    if (! MimeFilter.test(file.type)) {
     return options.allrules.validate2fields.alertText;
  }
}

Thanx Kashuda

Answer 1

好的,通过将这些行添加到以下内容找到了解决方案query.validationEngine-LANG.js:

"validateMIME":  {
    "func": function(field, rules, i, options){
   //add to input tag: data-validation-engine="validate[required, custom[validateMIME[image/jpeg|image/png]]]"

    var fileInput = field[0].files[0];
    var MimeFilter = new RegExp(rules[3],'i');

    if (fileInput) {
        return MimeFilter.test(fileInput.type);
    } else { return true;}
  },
"alertText": "* Wrong Mime Type."

},

Answer 2

通过修改代码,我实现了另一种验证文件MIME类型的方法:

首先将以下代码附加到jquery.validationEngine.js文件的'_validateField'方法中

case "checkFileType":
errorMsg = methods._checkFileType(field, rules, i, options);
break;

然后将以下代码附加到同一文件中

_checkFileType: function (field, rules, i, options) {
        var uploadedFile = $(field);
        if (uploadedFile) {
            var extensions = rules[i + 1];               
            var mimeFilter = new RegExp(extensions);
            if (!mimeFilter.test($(uploadedFile).val().split('.').reverse()[0])) {
                return options.allrules.checkFileType.alertText;
            }
        }
        else {
            return true;
        }            
    },

最后,将以下行附加到jquery.validationEngine-en.js文件

"checkFileType": {
                    "regex": "none",
                    "alertText": "* Wrong file Type."                    
                },

用法:

<input type="file" name="file" id="myfile" class="validate[checkFileType[jpg|jpeg|gif|JPG|png|PNG]]"/>