File Upload and Display

work

input [type=file] 获取上传文件的内容

Modify:

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_addFileContent: function (fileTag) {
    fileTag.addEventHandler("click", function () {
        $("#fileUpload").change(function () {
            var file = document.getElementById("fileUpload");

            if (file.files.length > 0) {
                var trueFile = file.files[0];
                console.log(document.getElementById("fileContent").value);
                var reader = new FileReader();

                reader.readAsText(trueFile, 'UTF-8');

                reader.onload = function () {
                    if (reader.error) {
                        console.log(reader.error);
                    } else {
                        var urlData = this.result;
                        document.getElementById("fileContent").value = urlData;
                    }
                };
            } else {
                console.log("Failed to upload file!");
            }
        });
    });          
}

Other ref:
Change event | MDN