Embed chart function in a webpage

New To Observable
1

Hi there, Sorry for the probably stupid question, but after a few hours of Googling, I could not find an answer and as the post suggest I am new to Observable.

So, I am an R user. In R, I can use Shiny App to publish an app that allows the user to upload data (in my case, an XML file of financial data extracted from a very well-known database) and do some charting, allowing some interactivity. R makes the whole process pretty easy.

In my understanding, since observable is written in Javascript, I could get my code and embed it on an external website. Is that correct?

For example, If I had to work directly in JavaScript, I could create a function to allow the user to upload the file and parse it (I could even ask ChatGPT to do it). However, I do not understand how I can use the observable charts I created, for example, in my notebook. I saw some examples using Plotly.

However, I wonder if it was possible to use the native charting function of observable embedding the code directly or with minimal work (I do not mind importing external libraries) in a website. I cannot embed an Iframe since I need the user to be able to import his/her own data. Sharing the notebook is not an option either since the user might not have the required skills to work with a notebook. So, I need to use a stand-alone website that I publish somewhere.

Is it possible? What libraries should I import? Is there any example that explains how to pass from a working notebook with a chart to a website embedding the existing code?

At the moment, even a very basic example to point me in the right direction could be very helpful.

Thanks in advance for any help.

Kind regards,

2

Hi there, have you come across the advanced embeds documentation? It might help in this scenario Advanced embedding and downloading / Observable | Observable .

1 Like
4

Dear thehogfather,
Thank you so much for your kind and prompt reply. I have been playing with the link you sent me for a while. I hope I found a solution that I am posting for you to check (I am not sure I used the async/await properly in: main.value(“bins”) … any help would be much appreciated) and for other newbies like me who could need it.
It is a very simple notebook (a bar chart of penguins that plots flipper_length_mm selecting the number of bins to show). I imported it into an HTML page. I used a button to change the number of bins from 12 to 3 and vice versa. In this case, I can read the value from the notebook, change it, read it again, and re-render the chart.

So, this is the notebook I am using:

This is the HTML and Javascript code I used:

<html>
<body>
    <div id="observablehq-chart-1c06e182"></div>
    <button id="logButton">Press Me to change the number of Bins</button>
</body>

<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/@observablehq/inspector@5/dist/inspector.css">
<script type="module">
    // imports the required libraries
    import { Runtime, Inspector } from "https://cdn.jsdelivr.net/npm/@observablehq/runtime@5/dist/runtime.js";
    import define from "https://api.observablehq.com/d/d1b505c4739f1024.js?v=3";

    // sets the main variable to read and write into notebook cells
    const main = new Runtime().module(define, name => {
        if (name === "chart") {
            return new Inspector(document.querySelector("#observablehq-chart-1c06e182"))
        } else if (name === "data") {
            return {
                pending() { console.log(`${name} is running…`); },
                fulfilled(value) { console.log(name, value); },
                rejected(error) { console.error(error); }
            }
        };
    });

    // sets an event listener for the click button
    const button = document.getElementById("logButton");
    button.addEventListener("click", changeBins);

    // function to change the number of bins in the notebook
    async function changeBins() {
        const oldValue = await main.value("bins");
        if (oldValue > 6) {
            main.redefine("bins", 3);
            const newValue = await main.value("bins");
            console.log(`clicked to change number of bins from: ${oldValue} to: ${newValue}`)
        } else {
            main.redefine("bins", 12);
            const newValue = await main.value("bins");
            console.log(`clicked to change number of bins from: ${oldValue} to: ${newValue}`)
        }
    }

</script>
</html>
1 Like