JSFiddle - React, Tailwind, and code Playground

HTML

<input id="Travellerpaymentinfo_cc_number" class="disabled" readonly="true"/>

CSS

.disabled {
    background:lightgrey;
}

JavaScript

$("#Travellerpaymentinfo_cc_number").click(function () {
    if (this.readOnly) {
        alert("The textbox is clicked.");
    }
});