Question

I am working with 3 divs at the moment – on pageLoad the default is viewed but when the user clicks on a button the div is hidden and the selected div appears in its place.

How would I write an if statement to identify the div currently selected by the user? For example:

if selected_div is 'dpara' then ....

else if selected_div is dtab then ....

Thanks in advance!

    <script type='text/javascript'>
        function arrange(div_id) {
            // First make all the divs hidden...
            divs = document.getElementsByTagName('div');
            for( var i = 0; i < divs.length; i++ ) {
                divs[i].style.display = 'none';
            }

            // Now make the one we want to be visible visible...
            document.getElementById(div_id).style.display = 'block';
        }
    </script>
    <form>
        <input type='button' value='dpara' onclick='arrange(this.value);' />
        <input type='button' value='dtab' onclick='arrange(this.value);' />
        <input type='button' value='ddl' onclick='arrange(this.value);' />
    </form>
    <div id='dpara'>
    </div>

    <div id='dtab' style='display: none'>
    </div>

    <div id='ddl' style='display: none'>
    </div>

Answer 1

As you’re already going through a function for each button click you could just keep the visible div in a variable, something like:

var visibleDiv;

function arrange(divId) {
    // Cache the passed in 'div' as the currently visible one
    visibleDiv = document.getElementById(divId);

    // First make all the divs hidden...
    var divs = document.getElementsByTagName('div'),
        i,
        len;

    for (i = 0, len = divs.length; i < len; i++) {
        divs[i].style.display = 'none';
    }

    // Now make the one we want to be visible visible...
    visibleDiv.style.display = 'block';
}