Preview the users's artwork

When a user finishes their design, they click the Publish button to begin the proofing process. This lets the user verify that their design will be printed as expected.

When a user finishes proofing their design, the integration is responsible for defining the next step and sending them there. Typically though, users want to:

Look at a preview of their finished artwork.
Add the printed version of the artwork to a shopping cart.

This part of the tutorial explains how to access a preview of the user's artwork and set up a (very basic) shopping cart.

Step 1: Detect when a user has finished proofing their design

After the initialize method, create an onArtworkCreate function:

const onArtworkCreate = (opts) => {
  // code goes here
};

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This function receives an opts objects that contains information about the user's artwork, including its ID, title, and a URL for previewing the artwork.

Then pass this function into the createDesign method:

const onProductSelect = (opts) => {
  api.createDesign({
    ...opts,
    onBackClick,
    onArtworkCreate,
  });
};

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Step 2: Create a shopping cart

When a user has finished proofing their design, partners typically:

Add the design to a shopping cart.
Show the user a preview of their design.

Then, if the users purchases the design, the partner sends it off for printing.

To create a (very basic) shopping cart, create a cart.ejs file in the src/views directory:

<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta
      name="viewport"
      content="width=device-width, initial-scale=1, minimum-scale=1, maximum-scale=1, user-scalable=no, viewport-fit=cover"
    />
    <title>Shopping cart</title>
  </head>
  <body>
    <h1>Shopping cart</h1>
    <table>
      <thead>
        <tr>
          <td>Artwork ID</td>
          <td>Artwork title</td>
          <td>Preview</td>
        </tr>
      </thead>
      <tbody>
        <tr>
          <td><%= artworkId %></td>
          <td><%= artworkTitle %></td>
          <td><a href="<%= previewImageSrc %>">Click here</a></td>
        </tr>
      </tbody>
    </table>
  </body>
</html>

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Then, in the server.js file, set up a route that renders this view:

app.get("/cart", async (request, response) => {
  response.render("cart");
});

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But while the page renders, it doesn't have the data it needs—the artworkId, artworkTitle, or previewImageSrc—to render correctly.

Step 3: Redirect users to the shopping cart

From the onArtworkCreate function, redirect users to the shopping cart and append the properties from the opts object to the URL as a query string:

const onArtworkCreate = (opts) => {
  // Create a query string
  const params = new URLSearchParams();

  // Add opts (artworkId, etc) to query string
  Object.keys(opts).forEach((key) => {
    params.append(key, opts[key]);
  });

  // Redirect the user to shopping cart
  window.location.href = `/cart?${params.toString()}`;
};

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Based on this change, you can pass the data from the opts object into the "cart" view:

app.get("/cart", async (request, response) => {
  response.render("cart", {
    artworkId: request.query.artworkId,
    artworkTitle: request.query.artworkTitle,
    previewImageSrc: request.query.previewImageSrc,
  });
});

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If you navigate through the proofing process, you're taken to the shopping cart page and shown a link to preview the artwork.

Example

src/views/cart.ejs

<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta
      name="viewport"
      content="width=device-width, initial-scale=1, minimum-scale=1, maximum-scale=1, user-scalable=no, viewport-fit=cover"
    />
    <title>Shopping cart</title>
  </head>
  <body>
    <h1>Shopping cart</h1>
    <table>
      <thead>
        <tr>
          <td>Artwork ID</td>
          <td>Artwork title</td>
          <td>Preview</td>
        </tr>
      </thead>
      <tbody>
        <tr>
          <td><%= artworkId %></td>
          <td><%= artworkTitle %></td>
          <td><a href="<%= previewImageSrc %>">Click here</a></td>
        </tr>
      </tbody>
    </table>
  </body>
</html>

html

src/views/index.ejs

<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta
      name="viewport"
      content="width=device-width, initial-scale=1, minimum-scale=1, maximum-scale=1, user-scalable=no, viewport-fit=cover"
    />
    <title>Print Partnership Example</title>
    <script src="https://sdk.canva.com/partnership.js"></script>
    <style type="text/css">
      body,
      html {
        margin: 0;
      }

      #container {
        height: 100vh;
      }
    </style>
  </head>
  <body>
    <div id="container"></div>
    <script type="text/javascript">
      (async () => {
        const api = await Canva.Partnership.initialize({
          apiKey: "<%= partnerApiKey %>",
          container: document.getElementById("container"),
          autoAuthToken: "<%= autoAuthToken %>",
        });

        const onBackClick = () => {
          console.log(
            "You clicked the 'Back' button in the Canva editor's header."
          );
        };

        const onArtworkCreate = (opts) => {
          // Create a query string
          const params = new URLSearchParams();

          // Add opts (artworkId, etc) to query string
          Object.keys(opts).forEach((key) => {
            params.append(key, opts[key]);
          });

          // Redirect the user to shopping cart
          window.location.href = `/cart?${params.toString()}`;
        };

        const onProductSelect = (opts) => {
          api.createDesign({
            ...opts,
            onBackClick,
            onArtworkCreate,
          });
        };

        api.showCatalog({
          onProductSelect,
        });
      })();
    </script>
  </body>
</html>

html

src/server.js

require("dotenv").config();
const express = require("express");
const jwt = require("jwt-simple");

const app = express();

app.set("views", "./src/views");
app.set("view engine", "ejs");

app.use(express.json());
app.use(express.urlencoded({ extended: true }));

app.get("/", async (request, response) => {
  // Get the current time
  const now = Math.floor(new Date().getTime() / 1000);

  // Create a payload
  const payload = {
    iss: process.env.PARTNER_API_KEY,
    sub: "12345",
    iat: now,
    exp: now + 60 * 30,
  };

  // Calculate the autoAuthToken
  const autoAuthToken = jwt.encode(payload, process.env.PARTNER_API_SECRET);

  response.render("index", {
    autoAuthToken,
    partnerApiKey: process.env.PARTNER_API_KEY,
  });
});

app.get("/cart", async (request, response) => {
  response.render("cart", {
    artworkId: request.query.artworkId,
    artworkTitle: request.query.artworkTitle,
    previewImageSrc: request.query.previewImageSrc,
  });
});

app.listen(process.env.PORT || 3000);

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