JSFiddle - React, Tailwind, and code Playground

by Vinay Pratap Singh Bhadauria

HTML

<form action="http://www.google.co.uk" target="_blank">
    <textarea name="first" placeholder="hello world"></textarea>
<input type="text" name="second" placeholder="another one" />
<input type="password" name="third" placeholder="my password" class="mypassword" />
    <input type="submit" />
    
</form>

CSS

.mypassword { background-color: lightgreen; }

input[type="text"]:focus {
    color: red;
}

JavaScript

var _debug = false;
var _placeholderSupport = function() {
    var t = document.createElement("input");
    t.type = "text";
    return (typeof t.placeholder !== "undefined");
}();

window.onload = function() {
    var arrInputs = document.getElementsByTagName("input");
    var arrTextareas = document.getElementsByTagName("textarea");
    var combinedArray = [];
    for (var i = 0; i < arrInputs.length; i++)
        combinedArray.push(arrInputs[i]);
    for (var i = 0; i < arrTextareas.length; i++)
        combinedArray.push(arrTextareas[i]);
    for (var i = 0; i < combinedArray.length; i++) {
        var curInput = combinedArray[i];
        if (!curInput.type || curInput.type == "" || curInput.type == "text" || curInput.type == "textarea")
            HandlePlaceholder(curInput);
        else if (curInput.type == "password")
            ReplaceWithText(curInput);
    }

    if (!_placeholderSupport) {
        for (var i = 0; i < document.forms.length; i++) {
            var oForm = document.forms[i];
            if (oForm.attachEvent) {
                oForm.attachEvent("onsubmit", function() {
                    PlaceholderFormSubmit(oForm);
                });
            }
            else if (oForm.addEventListener)
                oForm.addEventListener("submit", function() {
                    PlaceholderFormSubmit(oForm);
                }, false);
        }
    }
};

function PlaceholderFormSubmit(oForm) {    
    for (var i = 0; i < oForm.elements.length; i++) {
        var curElement = oForm.elements[i];
        HandlePlaceholderItemSubmit(curElement);
    }
}

function HandlePlaceholderItemSubmit(element) {
    if (element.name) {
        var curPlaceholder = element.getAttribute("placeholder");
        if (curPlaceholder && curPlaceholder.length > 0 && element.value === curPlaceholder) {
            element.value = "";
            window.setTimeout(function() {
                element.value = curPlaceholder;
            }, 100);
        }
   ...