$(document).ready(function () {
$("#block_1").change((e) => {
console.log("block_1 select ", e.target.value);
$("#children_1")
// .find("[value!='" + e.target.value + "']")
.find("option")
.removeAttr("selected");
$("#children_1")
.find("[value='" + e.target.value + "']")
.attr("selected", true);
});
});<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<title>jQuery</title>
<script src="js/jquery-2.1.1.min.js"></script>
<script src="js/script.js"></script>
</head>
<body
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