viewof image = imageInput({
crossOrigin: "anonymous",
initialUrl: await FileAttachment("beastie-boys.jpg").url()
})
image
viewof data = fileInput({
initialUrl: await FileAttachment("points.json").url()
})
data
function fileInput({
initialUrl, // e.g., "https://example.com/file.txt"
accept, // e.g., ".txt,.md"
load = value => value // A function to specify which value is exposed.
}) {
let file = null;
const form = html`<form>
${Object.assign(html`<input name=url>`, {value: initialUrl})}
<button>Submit</button>
${Object.assign(html`<input data-type=file name=file type=file multiple=true>`, {accept})}
`;
form.onsubmit = event => {
form.value = load(form.url.value);
form.dispatchEvent(new CustomEvent("input"));
event.preventDefault();
};
form.url.oninput = event => {
event.stopPropagation();
};
form.file.oninput = () => {
if (file !== null) URL.revokeObjectURL(file);
console.log('files', form.file.files)
form.value =[];
const len = form.file.files.length
for(let i=0; i<len; i++){
file = URL.createObjectURL(form.file.files[i]);
console.log(file);
form.value.push({file:load(form.url.value = file)
, filename:form.file.files[i].name
});
};
};
if (initialUrl !== undefined) {
form.value = load(initialUrl);
}
return form;
}
function imageInput({initialUrl, width, height, crossOrigin, accept = ".png,.jpg,.gif,.webp"}) {
return fileInput({
initialUrl,
accept,
load(url) {
return new Promise((resolve, reject) => {
const image = new Image;
image.style.display = "block";
if (width !== undefined) image.width = width;
if (height !== undefined) image.height = height;
if (crossOrigin !== undefined) image.crossOrigin = crossOrigin;
image.onload = () => resolve(image);
image.onerror = reject;
image.src = url;
});
}
});
}
function jsonInput({initialUrl, init, accept = ".json"}) {
return fileInput({
initialUrl,
accept,
load(url) {
return fetch(url, init).then(response => {
if (!response.ok) throw new Error(response.status + " " + response.statusText);
return response.json();
});
}
});
}
One platform to build and deploy the best data apps
Experiment and prototype by building visualizations in live JavaScript notebooks. Collaborate with your team and decide which concepts to build out.
Use Observable Framework to build data apps locally. Use data loaders to build in any language or library, including Python, SQL, and R.
Seamlessly deploy to Observable. Test before you ship, use automatic deploy-on-commit, and ensure your projects are always up-to-date.