172 lines
5.7 KiB
Plaintext
172 lines
5.7 KiB
Plaintext
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---
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title: Dropbox
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pagination_prev: demos/ml
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pagination_next: solutions/input
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---
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<head>
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<script type="text/javascript" src="https://www.dropbox.com/static/api/2/dropins.js" id="dropboxjs" data-app-key="4ysmnhy8wtm6k3w"></script>
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</head>
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Dropbox is a file hosting service that offers APIs for programmatic file access.
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"Dropbox Apps" are the standard way to interact with the service. The
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["Dropbox App"](#dropbox-app) section describes how this demo was configured.
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:::note
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The Dropbox API script is loaded in this page with
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```html
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<script type="text/javascript" src="https://www.dropbox.com/static/api/2/dropins.js" id="dropboxjs" data-app-key="4ysmnhy8wtm6k3w"></script>
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```
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The `data-app-key` used in this demo is a "Development" key associated with the
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`localhost` and `docs.sheetjs.com` domains. Dropbox API does not require
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"Production" approval for the Chooser or Saver.
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:::
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The live demos require a Dropbox account.
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## Reading Files
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"Chooser" is a small library that lets users select a file from their account.
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### Live Demo
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The button must have the following options:
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- `multiselect: false` ensures only one file can be selected
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- `folderselect: false` limits selection to real files
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- `linkType: "direct"` ensures the link points to a raw file
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When a file is selected, the `success` callback will receive an array of files
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(even if `multiselect` is disabled). Each file object has a `link` file which
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corresponds to a temporary URL that can be fetched.
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If the live demo shows a message about `Dropbox` being undefined, please reload
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this demo page.
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```jsx live
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function SheetJSChoisissez() {
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const [msg, setMsg] = React.useState("Press the button to show a Chooser");
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const btn = useRef(), tbl = useRef();
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React.useEffect(() => {
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/* create button */
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var button = Dropbox.createChooseButton({
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/* required settings */
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multiselect: false,
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folderselect: false,
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linkType: "direct",
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/* optional settings */
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extensions: ['.xlsx', '.xls', '.numbers'], // list of extensions
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/* event handlers */
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cancel: () => setMsg("User Canceled Selection!"),
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success: async(files) => {
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/* get file entry -- note that dropbox API always passes an array */
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var file = files[0];
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setMsg(`Selected ${file.name} ID=${file.id}`);
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/* fetch file and parse */
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var wb = XLSX.read(await (await fetch(file.link)).arrayBuffer());
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/* convert first sheet to HTML table and add to page */
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tbl.current.innerHTML = XLSX.utils.sheet_to_html(wb.Sheets[wb.SheetNames[0]]);
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}
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});
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/* add button to page */
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btn.current.appendChild(button);
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}, []);
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return ( <><b>{msg}</b><br/><div ref={btn}/><div ref={tbl}/></> );
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}
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```
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## Writing Files
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:::caution
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The Dropbox API was not designed for writing files that are created in the web
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browser. The Data URI approach is a neat workaround but should not be used in
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production for larger files. It is better to create the files in the server
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using NodeJS and generate a proper URL for Dropbox to fetch.
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:::
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"Saver" is a small library that lets users save files to their account.
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### Live Demo
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The file must be written before the Save button is created. Unfortunately the
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API does not accept data in the POST body, so the workaround is to create a data
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URI by writing with the `base64` type and prepending the URI metadata.
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This demo seeds data by fetching a file and writing to HTML table. The generated
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table is scraped to create a new workbook that is written to XLS.
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If the live demo shows a message about `Dropbox` being undefined, please reload
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this demo page.
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```jsx live
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function SheetJSEnregistrez() {
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const [msg, setMsg] = React.useState("Press the button to write XLS file");
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const btn = useRef(), tbl = useRef();
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React.useEffect(async() => {
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/* fetch data and write table (sample data) */
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const f = await(await fetch("https://sheetjs.com/pres.xlsx")).arrayBuffer();
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const wb = XLSX.read(f);
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tbl.current.innerHTML = XLSX.utils.sheet_to_html(wb.Sheets[wb.SheetNames[0]]);
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/* create workbook from table */
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const table = tbl.current.getElementsByTagName("TABLE")[0];
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const new_wb = XLSX.utils.table_to_book(table);
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/* write XLS workbook (Base64 string) */
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const b64 = XLSX.write(new_wb, { type: "base64", bookType: "xls" });
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/* create data URI */
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const url = "data:application/vnd.ms-excel;base64," + b64;
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/* create save button using the concise function call */
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var button = Dropbox.createSaveButton( url, "SheetJSDropbox.xls", {
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success: () => setMsg("File saved successfully!"),
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cancel: () => setMsg("User Canceled Selection!"),
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});
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/* add button to page */
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btn.current.appendChild(button);
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}, []);
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return ( <><b>{msg}</b><br/><div ref={btn}/><div ref={tbl}/></> );
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}
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```
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## Dropbox App
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This demo requires a "Dropbox app":
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0) Create a Dropbox app through the Developer tools. For this demo:
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- "Choose an APU": "Scoped access"
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- "Choose the type of access you need": "Full Dropbox"
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- "Name": (enter any name) "SheetJS Docs"
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:::caution
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The Dropbox API Terms and Conditions should be reviewed before acceptance.
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:::
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1) Configure the Dropbox app in the Developer tools.
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The following permissions should be selected in the "Permissions" tab
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- `files.metadata.write` (View and edit information about your Dropbox files and folders)
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- `files.metadata.read` (View information about your Dropbox files and folders)
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- `files.content.write` (Edit content of your Dropbox files and folders)
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- `files.content.read` (View content of your Dropbox files and folders)
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In the settings tab, under "Chooser / Saver / Embedder domains", the desired
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public domains should be added. `localhost` must also be added for development
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use (it is not automatically enabled).
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