JSFiddle - React, Tailwind, and code Playground

HTML

<form>
    <input type="text" value="" /><br/>
    <input type="text" value="" /><br/>
    <input type="text" value="" /><br/>
    <input type="text" value="" /><br/>
    <input type="submit" value="submit"> type a space and press Submit
</form>

CSS

.warning{
    background-color:#fff5f5;
}

JavaScript

$('form').submit(function(){
    return ($(':input[value*=" "]').addClass('warning').length > 0) ? false : true;
});