Error onchange (function) is not defined at HTMLSelectElement.function

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I’m a beginner in programming and today I need your help!(please :'()

I want to create a survey,so I begin to code and a error appear and I search a lot in internet but no solution.

There are my html and js codes.

/*the code isn't finish, this error block me(code name is sur.js*/
let choi;
let choix1 = 1;
let choix2 = 1;
let choix3 = 1;
function submit(){
console.log(choi);
}
function changer(){
getElementById('survey');
choi= sel.options[sel.selectedIndex];
console.log(choi);
}
<!DOCTYPE html>
<html>
<head>
<title>Robotale v8 : surveys</title>
<link rel="icon" href="https://www.mediafire.com/convkey/a940/qp7vky5trrp8hmzzg.jpg"/>
</head>
<body style="background-color:#000000">
<br>
<a href="Index.html">
<img src="https://www.mediafire.com/convkey/6586/bb0x08ff0tvjhepzg.jpg" onclick="redirection()"/>
</a>
<br>
<font face= "Verdana" size="4" color="#3399ff">The Robotale Website is here for your Robotale time!!!</p>
<br>
<p>Surveys:</p>
<br>
<form>
<label for="survey">Your feedback about this website!!!How do you like it?</label>
<select id="survey" name="survey" type="datalist" onchange="changer();">
<datalist id="surveys">
<option value="No">Nope!!!</option>
<option value="Yes">Yes!!!</option>
<option value="liv">THIS WEBSITE IS MY LIFE IF YOU DELETE IT I WILL DIE!!!(calm down please)</option>
</datalist>
</form>
<a href="Index.html">link to principal page</a>
<br>
<br>
<input type="submit" value="Send your feedback" id="food" onclick="submit()">
<br>
<script src"sur.js"></script>

</html>

Answer

You did not specify an incomplete call to the selector – getElementById('survey');. The rule is to use the document, and you need to write like this – document.getElementById('survey');.

Next, you have an undefined variable sel, and I mean that this variable is filled with data from document.getElementById('survey');. It turned out like this – let sel = document.getElementById('survey');

Now run this code and try to select a value from the dropdown list. There are no errors.

That is how it should be?

/*the code isn't finish, this error block me(code name is sur.js*/
let choi;
let choix1 = 1;
let choix2 = 1;
let choix3 = 1;
function submit(){
console.log(choi);
}
function changer(){
let sel = document.getElementById('survey');
choi= sel.options[sel.selectedIndex];
console.log(choi);
}
<!DOCTYPE html>
<html>
<head>
<title>Robotale v8 : surveys</title>
<link rel="icon" href="https://www.mediafire.com/convkey/a940/qp7vky5trrp8hmzzg.jpg"/>
</head>
<body style="background-color:#000000">
<br>
<a href="Index.html">
<img src="https://www.mediafire.com/convkey/6586/bb0x08ff0tvjhepzg.jpg" onclick="redirection()"/>
</a>
<br>
<font face= "Verdana" size="4" color="#3399ff">The Robotale Website is here for your Robotale time!!!</p>
<br>
<p>Surveys:</p>
<br>
<form>
<label for="survey">Your feedback about this website!!!How do you like it?</label>
<select id="survey" name="survey" type="datalist" onchange="changer();">
<datalist id="surveys">
<option value="No">Nope!!!</option>
<option value="Yes">Yes!!!</option>
<option value="liv">THIS WEBSITE IS MY LIFE IF YOU DELETE IT I WILL DIE!!!(calm down please)</option>
</datalist>
</form>
<a href="Index.html">link to principal page</a>
<br>
<br>
<input type="submit" value="Send your feedback" id="food" onclick="submit()">
<br>
<script src"sur.js"></script>

</html>


Source: stackoverflow