The Lexdown content editor is widely used in Lambda Feedback. It accepts:
- standard markdown
- $\LaTeX$ (delimited by $ and limited to KaTeX functionality)
- images (paste or drag and drop)
- videos (paste a URL)
The Lexdown editor is an adapted version of lexical to use markdown-first, and incorporate features including drag-and-drop images, embedded videos and audio, and switch to raw markdown.
Here's a walkthrough to create some basic content:
Use the $ sign to delimited inline maths. For example type the following:
This is inline maths, $\alpha<0$, and it is useful
Start a blank line with $$ then press the space bar. This will introduce an equation editor. Type raw ctrl+enter (Mac: cmd+enter) to exit the equation editing box.
For example, type the following after typing $$ [space] into a fresh line:
f(x) = \int_{-\infty}^\infty \hat{f}(\xi)\,e^{2 \pi i \xi x} \,\mathrm{d}\xi
If you begin a fresh line with --- (three dashes) then a horizontal rule appears. Alternatively click the button on the toolbar to insert a horizontal rule.
If you are editing a worked solution, then Lambda Feedback will split the worked solution into steps according to the location of horizontal rules. You can delete and add the rules and the solution steps will update.
For example:
This is the first step of the solution - which is a good hint towards solving
---
This is a second step, which makes it more obvious
---
Finally we reach the solution
When viewing the worked solutions, this is how it looks:
This is the process to create the solution steps:
You can add images with drag-and-drop or copy-and-paste. Images can be resized with the mouse, or click on the image to configure, or edit the raw markdown.
Drag + drop an audio file into the editor, or record audio on the 'Insert v' drowpdown in Lexdown.
Use 'Enter' for a new paragraph, or 'shift-Enter' for a line break.