JSFiddle - React, Tailwind, and code Playground

HTML

<h2>Before jQuery:</h2>
<div id="htmlBefore"></div>
<form action="#" method="post">
        <select onchange="change_option('SELECT___100E___7',this.options[this.selectedIndex].value)" name="SELECT___100E___7">
            <option value="0">dummy option 1</option>
            <option value="1">dummy option 2</option>
            <option value="2">dummy option 3</option>
            <option value="3">dummy option 4</option>
        </select>
        <select onchange="change_option('SELECT___123___6',this.options[this.selectedIndex].value)" name="SELECT___123___6">
            <option value="0">dummy option 1</option>
            <option value="1">dummy option 2</option>
            <option value="2">dummy option 3</option>
            <option value="3">dummy option 4</option>
        </select>
        <select onchange="change_option('SELECT___584E___52',this.options[this.selectedIndex].value)" name="SELECT___584E___52">
            <option value="0">dummy option 1</option>
            <option value="1">dummy option 2</option>
            <option value="2">dummy option 3</option>
            <option value="3">dummy option 4</option>
    </select>
</form>
<h2>After jQuery:</h2>
<div id="htmlAfter"></div>

CSS

#htmlBefore,
#htmlAfter {
    white-space: pre;
    background-color: #000;
    color: #0c0;
    display: block;
}

form {
    margin: 1em 0;
    border: 2px solid #ccc;
    padding: 0.5em;
}

JavaScript

$(document).ready(
    function(){
        $('#htmlBefore').text($('form').html());
        $('select').each(
            function(){
                if ($(this).attr('onChange')) {
                    var onChangeString = $(this).attr('onChange').replace('change_option','changeoption');
                    $(this).attr('onChange',onChangeString);
                }
            }
        );
        $('#htmlAfter').text($('form').html());
    }
);