JavaScript is a very powerful language; so powerful that some concepts inJavaScript can’t be shown using blocks. When PXT encounters a piece of codethat can’t be converted into blocks, it instead creates a grey JavaScript blockto preserve it. These blocks get converted right back into the originalJavaScript when you switch back to the text editor.

In the search box, search for javascript.enabled; Toggle the 'javascript.enabled' preference (right-click and select 'Toggle' or double-click the preference) to change the value from 'false' to 'true'. Click on the 'Reload current page' button of the web browser to refresh the page.

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The code in JavaScript blocks cannot be edited, but the blocksthemselves can be moved, copied, pasted, and deleted just like anyother block.

How do I get my JavaScript code to convert without any grey blocks?

The easiest way to write code that will convert cleanly back to blocksis to write the code using blocks and convert it to JavaScript. Many blockshave a very specific structure to their JavaScript that must befollowed in order to have them convert properly. If you have apiece of your code that does not convert, try looking at the blockyou were expecting and the JavaScript it produces.

For example, a for-loop must have this structure to convert to a block:

The following examples can’t be represented by the blocks:

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Try to match the JavaScript of the desired block as closely aspossible.

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