文件上传-在IE8 / IE9上处理

Question

I am using the JQuery validation plugin. As I have found out, I can't use FileData on IE8/IE9. The problem is, due to some reasons beyond my control, I also can't use something like IFrame of Flash to handle my files.

At the moment, my submitHandler is like the following

submitHandler: function (form) {
    if( window.FormData === undefined ) {
        alert("UNDEFINED");
    } else {
        formData   = new FormData(),
            params     = $(form).serializeArray(),
            fileOne    = $(form).find('[name="fileOne"]')[0].files,
            fileTwo    = $(form).find('[name="fileTwo"]')[0].files;

        if(fileOne.length != 0) {
            $.each(fileOne, function(i, file) {
                formData.append('fileOne-' + i, file);
            });
        }

        if(fileTwo.length != 0) {
            $.each(fileTwo, function(i, file) {
                formData.append('fileTwo-' + i, file);
            });
        }

        $.each(params, function(i, val) {
            formData.append(val.name, val.value);
        });

        $.ajax({
            type: "POST",
            url: "php/process.php",
            dataType: "json",
            data: formData,
            mimeType: "multipart/form-data",
            contentType: false,
            processData: false
        }).done(function (response) {

            });
        return false;
    }
},

So, it works as normal, but if it does not support FormData, at the moment I have it alerting Undefined. What I need it to do however is keep the validation on the other form fields because this seems to work on IE8, but to ignore anything to do with the uploaded files. So how would I get it calling my php script for IE8/IE9?

Any advice appreciated.

Thanks

Answer 1

Exclude file validation if FormData object doesn't exist

if (typeof formData == "undefined") {
   //don't do file validation
}