用javascript加载和读取本地文本文件的最简单方法？

Question

I have a .csv file that I wish to load that contains information that the .HTML page will format itself with. I'm not sure how to do this however,

Here's a simple image of the files: http://i.imgur.com/GHfrgff.png

I have looked into HTML5's FileReader and it seems like it will get the job done but it seems to require usage of input forms. I just want to load the file and be able to access the text inside and manipulate it as I see fit.

This post mentions AJAX, however the thing is that this webpage will only ever be deployed locally, so it's a bit iffy.

How is this usually done?

Answer 1

Since your web page and data file are in the same directory you can use AJAX to read the data file. However I note from the icons in your image that you are using Chrome. By default Chrome prevents just that feature and reports an access violation. To allow the data file to be read you must have invoked Chrome with a command line option --allow-file-access-from-files .

An alternative, which may work for you, is to use drag the file and drop into onto your web page. Refer to your preferred DOM reference for "drag and drop files".

Answer 2

You can totally make an ajax request to a local file, and get its content back.

If you are using jQuery, take a look at the $.get() function that will return the content of your file in a variable. You just to pass the path of your file in parameter, as you would do for querying a "normal" URL.

Answer 3

You cannot make cross domain ajax requests for security purposes. That's the whole point of having apis. However you can make an api out of the $.get request URL.

The solution is to use YQL (Yahoo Query Language) which is a pretty nifty tool for making api calls out of virtually any website. So then you can easily read the contents of the file and use it.

You might want to look at the official documentation and the YQL Console

I also wrote a blog post specifially for using YQL for cross domain ajax requests. Hope it helps

Answer 4

You can try AJAX (if you do not need asynchronous processing set "async" to false. This version below ran in any browser I tried when employed via a local web server (the address contains "localhost") and the text file was indeed in the UTF-8-format. If you want to start the page via the file system (the address starts with "file"), then Chrome (and likely Safari, too, but not Firefox) generates the "Origin null is not allowed by Access-Control-Allow-Origin."-error mentioned above. See the discussion here .

    $.ajax({
        async: false,
        type: "GET",
        url: "./testcsv.csv",
        dataType: "text",
           contentType: "application/x-www-form-urlencoded;charset=UTF-8",
        success: function (data) {
             //parse the file content here
           }
        });

The idea to use script-files which contain the settings as variables mentioned by Phrogz might be a viable option in your scenario, though. I was using files in the "Ini"-format to be changed by users.