After a user creates a design, they may want to edit that design at a later point in time. To enable this, Canva provides your website with the ID of the design. You can use this ID to re-open a design in the Canva editor.

This part of the tutorial series explains how to open an existing design in the Canva editor.

Step 1: Get the ID of the design

You can get the ID of a design in the following ways:

• Using an HTML input element.

• Using JavaScript callback functions.

You can use whatever option is most convenient.

Option 1: Using an HTML input element

On the same page as the Canva Button, create an input element with a unique name attribute:

<input name="designId" />

Add either (or both) of the following attributes to the Canva Button's button element:

• data-on-design-open-input-design-id

• data-on-design-publish-input-design-id

Then set these attributes to the value of the input element's name attribute:

<button
  data-design-type="Poster"
  data-on-design-open-input-design-id="designId"
  data-on-design-publish-input-design-id="designId"
  data-api-key="API KEY GOES HERE"
  class="canva-design-button"
  style="display: none;"
  >Design on Canva</button
>
<script>
  (function (c, a, n) {
    var w = c.createElement(a),
      s = c.getElementsByTagName(a)[0];
    w.src = n;
    s.parentNode.insertBefore(w, s);
  })(document, "script", "https://sdk.canva.com/designbutton/v2/api.js");
</script>

If the data-on-design-open-input-design-id attribute is defined, Canva inserts the ID of the design into the specified field when the user opens a design. This includes when creating a new design or editing an existing design.

If the data-on-design-publish-input-design-id attribute is defined, Canva inserts the ID of the design into the specified field when the user publishes their design.

When Canva inserts a value into the input element, save the ID for future use.

Option 2: Using JavaScript callback functions

On the same page as the Canva Button, create two JavaScript functions:

function onDesignOpen(opts) {
  console.log(opts);
}
​
function onDesignPublish(opts) {
  console.log(opts);
}

Each function should accept a single argument. These functions receive the same parameters as the JavaScript API's onDesignOpen and onDesignPublish functions.

Add either (or both) of the following attributes to the Canva Button's button element:

• data-on-design-open

• data-on-design-publish

Then set these attributes to the names of the JavaScript functions:

<button
  data-design-type="Poster"
  data-on-design-open="onDesignOpen"
  data-on-design-publish="onDesignPublish"
  data-api-key="API KEY GOES HERE"
  class="canva-design-button"
  style="display: none;"
  >Design on Canva</button
>
<script>
  (function (c, a, n) {
    var w = c.createElement(a),
      s = c.getElementsByTagName(a)[0];
    w.src = n;
    s.parentNode.insertBefore(w, s);
  })(document, "script", "https://sdk.canva.com/designbutton/v2/api.js");
</script>

When a user opens a design, Canva calls the function specified in the data-on-design-open attribute. This includes when creating a new design or editing an existing design.

When a user publishes a design, Canva calls the function specified in the data-on-design-publish attribute.

You can access the ID of the design via the opts.designId parameter:

function onDesignOpen(opts) {
  console.log(opts.designId);
}
​
function onDesignPublish(opts) {
  console.log(opts.designId);
}

When Canva calls these functions, save the ID for future use.

Step 2: Open an existing design in the Canva editor

To open an existing design in the Canva editor, create a Canva Button with a data-design-id attribute:

<button
  data-design-id="DESIGN ID GOES HERE"
  data-api-key="API KEY GOES HERE"
  class="canva-design-button"
  style="display: none;"
  >Edit design</button
>
<script>
  (function (c, a, n) {
    var w = c.createElement(a),
      s = c.getElementsByTagName(a)[0];
    w.src = n;
    s.parentNode.insertBefore(w, s);
  })(document, "script", "https://sdk.canva.com/designbutton/v2/api.js");
</script>

The presence of the data-design-id attribute on the button element tells the Canva Button SDK that clicking this button should open an existing design. The value of the data-design-id attribute must be the ID of a design.