jad jad - 1 month ago 5
HTML Question

How to upload multiple files using one file input element

I'm trying to use one file input element to upload multiple files to Drive using html form. This seems to work only for one file, although the file picker allows selecting multiple files. Back in the script log viewer, I only see one file captured of the two I uploaded. Is this unsupported, or am I going the wrong way about it?

Code.gs:

function logForm(form) {
Logger.log(JSON.stringify(form));
return true;
}


index.html:

<html>
<form id="uploadTest" enctype="multipart/form-data">
<input type="file" multiple="multiple" name="fileUpload">
<input type="button" id="upload" value="upload"
onclick="google.script.run.logForm(document.getElementById('uploadTest'));">
</form>
</html>


Log view:

{"fileUpload":{"contents":"GIF87a\u0001\u0000\u0001\u0000�
\u0000\u0000��̖��,\u0000\u0000\u0000\u0000\u0001\u0000
\u0001\u0000\u0000\u0002\u0002D\u0001\u0000;",
"type":"image/gif","name":"1x1.gif","length":35}}

Answer

The multiple file select in the dialog when you click on the browse button of the file field happens only for the new browsers supporting HTML5. It wont allow multiple select for old browsers. For older browsers the only good solutions are flash or javascript plugins. Here is a good resource for jquery uploaders ( some support multiple files ): http://creativefan.com/10-ajax-jquery-file-uploaders/. Hence my suggestion is use some plugin so that its supported on old as well as the new browsers.