overleaf/services/web/public/coffee/directives/expandableTextArea.coffee

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CoffeeScript
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define [
"base"
], (App) ->
App.directive "expandableTextArea", () ->
restrict: "A"
link: (scope, el) ->
resetHeight = () ->
curHeight = el.outerHeight()
fitHeight = el.prop("scrollHeight")
if fitHeight > curHeight and el.val() != ""
scope.$emit "expandable-text-area:resize"
el.css("height", fitHeight)
scope.$watch (() -> el.val()), resetHeight