ruby on rails - How to show interactive character limits? -


How does the stack overflow show the interactive character limit? While editing comments, it shows how many characters you have left, as well as the warning is too low.

I want the exact functionality of my Ruby on the railway ... but not sure how to do this?

I use the following javascript function to restrict max length in textareas 

  Function Czech Lang (edit, max) {if (edit.value.length & gt; maxlen) edit.value = edit.value.substring (0, MaxLen); Document.getElementById ('left'). InnerHTML = edit.value.length; }

Link the onKeyDown and onKeyUp attributes of your textarea to: 

  onKeyDown = "checkLength (this, 100);"

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