Ace editor - It doesn´t change the error window dynamically - ace-editor

Question

I have the next code:
var exeWindow = document.getElementById("exeWindow");
var errorWindow = document.getElementById("errorWindow");
var annot = editor.getSession().getAnnotations();
editor.getSession().on("changeAnnotation", execute);
function execute(){
exeWindow.innerHTML = eval(editor.getValue());
errorWindow.innerHTML = "";
annot = editor.getSession().getAnnotations();
for (var key in annot){
if (annot.hasOwnProperty(key))
console.log(annot[key].text + "on line " + " " + (parseInt(annot[key].row)+1));
errorWindow.innerHTML = annot[key].text + " Line " + " " + (parseInt(annot[key].row)+1);
exeWindow.innerHTML = "";
}
if (TogetherJS.running) {
TogetherJS.send({type: "execute"});
}
};
Im trying to capture the error logs, and before execute a valid code works, but once I introduce for example 2+2, despite of exeWindow changes correctly, if a rewrite it to 2+a for example, searching a new error, the exeWindow doesn´t changes and the error does not appears in errorWindow.
EDIT: Sorry, the problem is that is not getting the correct errors, only the errors like 'missing semicolon'.

Answer 1

If someone is interested, the solution I found is the next one:
function execute(){
try {
exeWindow.innerHTML = eval(editor.getValue());
errorWindow.innerHTML = "";
} catch(err){
var annot = editor.getSession().getAnnotations();
for (var key in annot){
if (annot.hasOwnProperty(key)){
errorWindow.innerHTML = annot[key].text + " Line " + " " + (parseInt(annot[key].row)+1);
exeWindow.innerHTML = "";
}
}
}
if (TogetherJS.running) {
TogetherJS.send({type: "execute"});
}
};
Simple as that :)