JSFiddle - React, Tailwind, and code Playground

HTML

<div id="search1">          
    <div class="forminput">              
        Label 1<br />              
        <input type="text" name="Field1" value="" size="20" />          
    </div>          
    <div class="forminput">              
        Label 2<br />              
        <input type="text" name="Field2" value="" size="20" />         
    </div>  
</div>

JavaScript

$(function() {
    $(".forminput input[type='text']").val("Hello world!");
});