JSFiddle - React, Tailwind, and code Playground

HTML

<input type="text" id="box1" />
<input type="text" id="box2" />

JavaScript

var mouseDownID;

$('#box1').blur(function () {
   console.log('box1 is being blurred, ' + mouseDownID + ' will gain focus'); 
});

$('#box2').mousedown(function () {
    mouseDownID = this.id;
    console.log('mousedown fired on ' + mouseDownID);
});