In this article I will explain with an example, how to dynamically change HTML INPUT Type using JavaScript.
This article will illustrate how to dynamically change the Type attribute of HTML TextBox from Text to Password using JavaScript.
HTML does not allow the Type attribute to be modified with JavaScript at runtime and hence the same can be achieved by creating a dynamic TextBox next to the Password TextBox and hiding the Password TextBox.
HTML Markup
The HTML Markup consists of an HTML Password TextBox and a CheckBox. The CheckBox has been assigned a JavaScript OnClick event handler.
<table border="0" cellpadding="0" cellspacing="0">
        <td><input type="password" id="txtPassword" /></td>
        <td><label for="chkShowPassword">
                <input id="chkShowPassword" type="checkbox" onclick="ShowPassword(this)" />
                Show password</label>
Dynamically changing HTML INPUT Type using JavaScript
Inside the ShowPassword JavaScript function, the reference of the CheckBox is received as parameter.
Then the Password TextBox is referenced and if the CheckBox is checked, a dynamic TextBox element is created and appended next to it and the Password TextBox is hidden.
If the CheckBox is unchecked, the dynamic TextBox element is removed and the Password TextBox is shown again.
<script type="text/javascript">
    function ShowPassword(chkShowPassword) {
        //Reference the TextBox.
        var txtPassword = document.getElementById("txtPassword");
        var txtTemp;
        //If CheckBox is Checked i.e. Password needs to be shown.
        if (chkShowPassword.checked) {
            //Remove if any TextBox present next to the Password TextBox.
            if (txtPassword.nextSibling != null) {
            //Create a TextBox element and set the value of Password TextBox to it.
            txtTemp = document.createElement('INPUT');
            txtTemp.setAttribute('TYPE', 'TEXT');
            txtTemp.setAttribute('VALUE', txtPassword.value);
            //Set the value of TextBox back to Password TextBox on OnChange event.
            txtTemp.onchange = function () {
                txtPassword.value = this.value;
            //Insert the TextBox next to the Password TextBox.
            txtPassword.parentNode.insertBefore(txtTemp, txtPassword.nextSibling);
            //Hide the Password TextBox.
   = "none";
        } else {
           txtTemp = txtPassword.nextSibling;
            //Set the value of the TextBox to the Password TextBox.
            txtPassword.value = txtTemp.value;
            //Remove the TextBox.
            //Show the Password TextBox.
   = "block";
Dynamically change HTML INPUT Type using JavaScript
Browser Compatibility

The above code has been tested in the following browsers.

Internet Explorer  FireFox  Chrome  Safari  Opera 

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