I renamed the custom Contentstack widget that I had previously developed to render the JSON of an entry to include links to Developer and added links to edit the content type and preview the page. I did not have to change any HTML or JavaScript to get this to work in the new (2021) Contentstack Venus user interface.
I pass configuration to the extension to specify the server root for previewing.
{
"preview": {
"baseurl": "https://localhost:5001"
}
}
As someone who doesn’t know HTML or JavaScript, I think that the code is relatively straightforward.
<!doctype html>
<html lang="en">
<head>
<meta charset="UTF-8"/>
<title>Ace Editor Extension</title>
<style>
body { margin: 0; }
</style>
<link href="https://assets.contentstack.io/v3/assets/blt30b41f7b9a5d7467/bltb6bb4f7db098181f/5b39e605fda2af4e7866b92c/jsoneditor.min.css" rel="stylesheet" type="text/css">
https://www.contentstack.com/sdks/contentstack-ui-extensions/dist/latest/ui-extension-sdk.js
https://cdn.jsdelivr.net/npm/lodash@4.17.4/lodash.min.js
https://assets.contentstack.io/v3/assets/blt30b41f7b9a5d7467/blte7fe106cc93cf2bf/5b33888fcfc846f95726af6f/jsoneditor.min.js
</head>
<body>
<pre>Edit Content Type: <a id="ctlink" href="" target="_blank">Edit Content Type</a>
Visit: <a id="visit" href="" target="_blank"></a></pre>
<div id="jsoneditor"></div>
<script>
window.extensionField = {};
var jsoneditorElement = document.getElementById("jsoneditor");
var jsonEditor = {};
ContentstackUIExtension.init().then(function(extension) {
extensionField = extension;
var value = extensionField.entry._data;
var options = {
modes: ['text', 'code', 'tree', 'form', 'view'],
mode: 'code',
ace: ace,
};
jsonEditor = new JSONEditor(jsoneditorElement, options);
jsonEditor.set(value);
document.getElementById("ctlink").href = "/#!/stack/"
+ extensionField.stack["_data"]["api_key"]
+ "/content-type/" + extensionField.entry.content_type["uid"]
+ "/content-type-builder";
document.getElementById("ctlink").target = "ctedit"
+ extensionField.entry.content_type["uid"];
document.getElementById("ctlink").innerHTML =
extensionField.entry.content_type["uid"];
var url = extensionField.entry._data["url"];
if (!(typeof url === 'undefined'))
{
var baseurl = extensionField.config["preview"]["baseurl"];
if (!(typeof baseurl === 'undefined'))
{
url = baseurl + url;
}
document.getElementById("visit").href = url;
document.getElementById("visit").target = "visit"
+ extensionField.entry.uid;
document.getElementById("visit").innerHTML = url;
}
});
</script>
</body>
</html>
Update 30.April.2021: Updated code with the following enhancement and the missing CSS file.
Deliverystack.net 
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