JSFiddle - React, Tailwind, and code Playground

by amantur

HTML

<textarea>
An item with this x Id already exists.
 An item with this y id already exists.
 An item with this barcode already exists.
</textarea>
<br/>
<button text="check" id="chk"/>check</button>

JavaScript

function checkIt(msg) {
    alert("[" + msg + "]");
    var aLines = msg.split(/\r?\n+/);

    for (var i in aLines) {
        if (!aLines[i]) {
            alert("Error!\r\n["+aLines[i]+"]");
            continue;
        }
        alert(i + ": \"" + aLines[i] + "\"");
    }
}
$(function() {
    $("#chk").click(function() {
        var a="";
        if(!a){
            alert("!a");
        }
        checkIt($("textarea").val());
    });
});