JSFiddle - React, Tailwind, and code Playground

by wiltomap

HTML

<table>
    <tr>
        <td>nhydra</td>
        <td><input type="text" name="nhydra"/></td>
    </tr>
    
    <tr>
        <td>codhydra</td>
        <td><input type="text" name="codhydra"/></td>
    </tr>
    
    <tr>
        <td>next</td>
        <td><input type="text" name="next"/></td>
    </tr>
</table>

CSS

table td {
    border: solid 1px black;
}

JavaScript

//$('td:contains("nhydra")').parent().toggle();

$('input[name=codhydra]').change(function(){
    var numhydra = $('input[name=codhydra]').val();
    var numhydra = numhydra.substr(5,4);
    var numhydra = numhydra.replace(/^0+/, '');
    $('input[name=nhydra]').val(numhydra);
});