Limiting the display to only a portion of the document in Monaco Editor

Is there a way to display only a specific portion of a document, or in the case of Monaco, a model, while still maintaining intellisense for the entire document?

I am looking to enable users to edit only certain sections of a document, yet still have access to relevant contextual intellisense.

Ideally, I would like to conceal the uneditable parts, but simply deactivating them could also work.

If this is not feasible, are there any embedded editors capable of achieving this, or can it be accomplished by customizing the language server?

Answer №1

Monaco editor has a unique way of loading each line by placing it in a container under the "view-lines" class section. After loading the editor content, you can hide specific lines by setting the corresponding container's display property to "none."

To see the implementation, visit https://jsfiddle.net/renatodc/s6fxedo2/

let value = `function capitalizeFirstLetter(string) {
\treturn string.charAt(0).toUpperCase() + string.slice(1);
}

$(function() {
\tlet word = "script";
\tlet result = capitalizeFirstLetter(word);
\tconsole.log(result);
});
`
let linesToDisable = [1,2,3];
let editor = monaco.editor.create(document.getElementById('container'), {
    value,
    language: 'javascript',
    theme: 'vs-dark',
    scrollbar: {
      vertical: "hidden",
      handleMouseWheel: false
    },
    scrollBeyondLastLine: false
});

// Triggered event for Monaco Editor load completion: https://github.com/Microsoft/monaco-editor/issues/115
let didScrollChangeDisposable = editor.onDidScrollChange(function() {
    didScrollChangeDisposable.dispose();
    setTimeout(function() {
      $(".monaco-editor .view-lines > div").each(function(i) {
        if(linesToDisable.includes(i+1)) {
          $(this).css("display","none");
          $(this).css("pointer-events","none");
        }
      });
    },1000);
 }); 

Continuous scrolling may cause the hidden lines to reappear and disrupt the functionality. To prevent this, disable scrolling in Monaco, set a fixed height for the editor container, and utilize the browser or a parent container for scrolling.

If navigating to hidden content using arrow keys causes cursor issues, consider handling this behavior using the onKeyDown event of the editor.

For a reliable implementation, consider loading Monaco editor with only the editable portion of the document and extending the completion provider (Intellisense) as demonstrated in this example: https://microsoft.github.io/monaco-editor/playground.html#extending-language-services-completion-provider-example

monaco.languages.registerCompletionItemProvider('javascript', {
    provideCompletionItems: function(model, position) {
        return {
            suggestions: [
                {
                    label: "capitalizeFirstLetter",
                    kind: monaco.languages.CompletionItemKind.Method,
                    documentation: "Capitalize the first letter of a word",
                    insertText: "capitalizeFirstLetter("
                }
            ]
        };
    }
});

monaco.editor.create(document.getElementById("container"), {
    value: `$(function() {
\tlet word = "script";
\tlet result = capitalizeFirstLetter(word);
\tconsole.log(result);
});
  `,
    language: "javascript"
});

For extracting identifiers from your source document, consider utilizing an AST parser like Esprima and incorporating them into the suggestions array.

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