var height = document.body.clientHeight- 110; var editor = CodeMirror.fromTextArea(document.getElementById("codeInput"), { lineNumbers: true, lineWrapping: true, mode: "javascript" }); editor.setSize("100%", height); function run() { var option = editor.getValue(); axios.post("/", JSON.parse(option)).then(function(resp) { document.getElementById("svg").innerHTML = resp; }); }