javascript显示和隐藏div元素

Question

I am new to Javascript, and I currently have an article that is being fetched from database, the article has two rows. title & content there are about 100 of these in my database. Now the objective is to list all the titles first, and when a user clicks on a title, to make the the relevant content appear underneath it. I can do this however this way.

<?php
//mysql query here...
foreach($result as $row) { ?>
<div id='title'> <?= $row['title'] ?> </div>
<div id='<?= $row['id'] ?>' style='display:none' 
             onclick=showContent(<?= $row['id'] ?>) > <?= $row['content'] ?> 
</div>
<?php } ?>

The javascript to hide the show the content is this:

<script type='text/javascript'>
function showContent(id){
    document.getElementById(id).style.display='inline';
}
</script>

The showContent() function hides the div based on the id passed through the paramenter. But, the only problem is that, I need other previously displayed divs to truntate when a new one opens.

Meaning, the content should be visible only once, then when you click on another title, the previously opened content should disappear and only the new content should appear.

I hope that made sense. as I am lacking the grammar to explain it all. I tried to give small example here, which for some reason does not seem to work at all, but does in my localhost http://jsfiddle.net/YL6aH/

---

EDITED:

My full PHP loop, together will all the js/html

    <?php 
            $articlesForPreview = $createQuery
                ->query("SELECT * FROM timeline");              
                $fetchAll = $articlesForPreview->fetchAll(PDO::FETCH_ASSOC);    
                foreach($fetchAll as $row) {?>
                <div id='timeline_container'>
                <span class='timeline_date'> <?= $row['time'] ?></span>
                <span class='timeline_title'> <a href='#' onclick=timeline(<?= $row['id'] ?>)><?= $row['title'] ?></a></span>
                <p id='<?= $row['id'] ?>' style='display:none;'> <?= $row['event'] ?></a></span>
            </div>

            <?php }?>



    </aside>
</section>

<script type='text/javascript'>
function timeline(id){
    document.getElementById(id).style.display='inline';
}
</script>

<footer id='footer_container'> 

Answer 1

You should try this :

function showContent(id){
    $('.active').hide().removeClass('active');
    $('#'+id).show().addClass('active');
}

I see also that you will have multiple elements with id=title , you must change it to make every elem unique.

Answer 2

You can simply remember the last item that is visible:

var active;
function showContent(id){
    if (active) active.style.display = 'none'; // hide previously visible element
    active = document.getElementById(id);    // keep track of the element you are about to show
    active.style.display='inline'; // show the new element
}

Keep in mind that this solution starts with no items visible and after that only allows one item to be visible at a time.

Answer 3

You can go through all elements with an onclick of "showContent", hide them all, afterwards you can just show the one you want.

function showContent(id){
    var allElements = document.getElementsByTagName('*');
    for ( var i = 0; i<allElements.length; i++ ) {    
        if ( (allElements[i].onclick + "").indexOf("showContent") >= 0) {
            allElements[i].style.display = "none";       
        }
    }
    document.getElementById(id).style.display='inline';
}

Answer 4

I'm pretty new to javascript and jquery myself, but one of the things we just did in the class I'm taking was the accordion display, where you attach event handlers in the document.ready for the click events for the header objects, and their div children elements, and it was done by swapping the css classes on the click events... are you using css? in our version, anytime we clicked on a plus, it would expand the display to display the divs below, and clicking the minus pic it would close them... ours did it for all of them, but you should be able to code that even to "close" all of those displays, and then open/display only the divs that are children for the item clicked... is that what you're looking for?