I’m attempting to pass a file from an file input field’s file list through FileReader and get the Base64 string to pass to the server via axios. The FileReader’s onload function seems to get the string, but it evidently loses the string before it is returned. So, the value is undefined when I try to append it to the form
Tag: filereader
FileReader upload safety
Say I have <input type=”file”> without any forms, and obtain an image selected by this input via File’s Blob javascript API: And that’s all. Say, there is no php script in my server at all. User just uploads picture via the code below, and, for example, see how the picture is displaying in the web page. In this case, is
Chrome, FileReader API, event.target.result === “”
I have a web app which does some processing on big text-files (> 500mb) via the FileReader API’s readAsText() method. It has been working great for years but suddenly I got empty responses: event.target.result is an empty string. 369MB works but 589MB does not work. I have tested on multiple computers; same result, however it does work in Firefox. Chrome
Parse Uploaded CSV file using D3.js
I’m new to d3.js so I know this might seem as a silly question to some so please bear with me. I’m trying to parse a csv file which a user uploads and print it’s output in the console. I’m able to parse the CSV file when I provide the absolute path of the CSV file but when I try
Convert Blob to binary string synchronously
I’m trying to put image in clipboard when user copies canvas selection: So I thought the right way would be to convert canvas tu dataURL, dataURL to blob and blob to binary string. Theoretically it should be possible to skip the blob, but I don’t know why. So this is what I did: But when the DataTransfer object is used
How to parse Excel (XLS) file in Javascript/HTML5
I am able to read Excel file via FileReader but it outputs text as well as weird characters with it. I need to read xls file row-wise, read data in every column and convert it to JSON. How to read xls file row by row? Answer Below Function converts the Excel sheet (XLSX format) data to JSON. you can add