Develop Reference

Auto scroll a webpage with rss-feed, item by item

I'm making a wallboard (monitor with a newsfeed on it). I'm new to javascript but managed to find a few sources that helped me to put an RSS-feed on a PHP-page and format it with CSS.
So far so good!
To turn this page into a wallboard, I'd like to show one feed-item for a few seconds and then have to page automatically scroll to the next item. Each feed-item is in a <div class="post">.
Could someone please help me with some sample autoscroll code?
I've tried to scroll continuously through the page, but that is not the effect that I'm looking for.
This is the code of a <div> that shows a post:
<div class="post">
<div class="post-head">
<h2><a class="feed_title" href="<?php echo $link; ?>"><?php echo $title; ?></a></h2>
<span><?php echo $pubDate; ?></span>
</div>
<div class="post-content">
<?php echo implode(' ', array_slice(explode(' ', $description), 0, 20)) . "..."; ?> Read more
</div>
</div>
To scroll, I currently use a script from javascriptkit.com:
<script language="JavaScript1.2">
var currentpos=0,alt=1,curpos1=0,curpos2=-1
function initialize(){
startit()
}
function scrollwindow(){
if (document.all)
temp=document.body.scrollTop
else
temp=window.pageYOffset
if (alt==0)
alt=1
else
alt=0
if (alt==0)
curpos1=temp
else
curpos2=temp
if (curpos1!=curpos2){
if (document.all)
currentpos=document.body.scrollTop+1
else
currentpos=window.pageYOffset+1
window.scroll(0,currentpos)
}
else{
currentpos=0
window.scroll(0,currentpos)
}
}
function startit(){
setInterval("scrollwindow()",100)
}
window.onload=initialize
</script>
The page that I have now is available here:
https://app-storage.org/mrm/rsstest.php
The effect I'm looking for is:
1. Show the first news item
2. wait a few seconds
3. smoothly scroll to the second news item
4. at the end of the page, return to the first item
Any help is greatly appreciated!!!

PHP echo statement within getElementByID div tag

I've currently got a form which i use from Gravity forms, here is my html code
<div class="dropdown">
<button onclick="myFunction()" class="dropbtn">SPECIFY PRODUCT</button>
<div id="myDropdown_<?php echo get_the_ID(); ?>" class="dropdown-content">
<?php gravity_form( 1, false, false, false, '', true ); ?>
</div>
</div>
as you can see i'm echoing the product ID from woocommerce to give a different div id dependent on which product the user clicks on. This works fine.
Although, now when i create javascript function :
function myFunction() {
document.getElementById("myDropdown_<?php echo get_the_ID(); ?>").classList.toggle("show");
}
how can I pull through 'get_the_ID' like i have in the html code so it can dropdown my form in accordance to the product selected?
You can take a look at it here : http://www.ctagroup.com.au/cta-group-home/products/tactile-guidance/suresteel/suresteel-classic/
Any help would be greatly appreciated.
Regards

It is because the "myDropdown_<?php echo get_the_ID(); ?>" part is treated as string not PHP code.
Try this way:
<script>
var theId = "<?php echo get_the_ID(); ?>";
function myFunction() {
document.getElementById("myDropdown_" + theId).classList.toggle("show");
}
</script>

You always can try to generate JS code by PHP instead.
Of course in case, if the attempts to solve the problem have been unsuccessful.
Don't see any problems with this "technique".

Why is jQuery(document).ready not working? / How do I add CSS to an element in jQuery?

I'm new to jQuery and I'm having problem with a piece of code.
I'm trying to add Image Power Zoomer v1.2 to my website, which works on the main image, but not the rollover image! The rollover image changes, but power zoomer only shows the loading image.
This is an example URL: Example1
This is my code:
<script type="text/javascript">
var bufferImage = new Array();
function Buffer(filename) {
var i = bufferImage.length;
bufferImage[i] = new Image();
bufferImage[i].src = filename;
}
function showImage(filename) {
document.images[Image_Name].src = filename;
}
Image_Name = "image_pal";
Buffer("thumbnail.php?pic=<? echo $image_pal['media_url'];? >&w=600&sq=Y");
jQuery(document).ready(function($){ //fire on DOM ready
$('#myimage').addpowerzoom({
powerrange: [2,8],
largeimage: null,
magnifiersize: [200,200] //<--no comma following last option!
})
})
</script>
<? $sql_image_pal=$db->query("SELECT media_url FROM " . DB_PREFIX . "auction_media WHERE auction_id='" . $item_details['auction_id']."'AND media_type=1 ORDER BY media_id ASC ");
$image_pal=$db->fetch_array($sql_image_pal);
$sql_image=$db->query("SELECT media_url FROM " . DB_PREFIX . "auction_media WHERE auction_id='" . $item_details['auction_id']."'AND media_type=1 ORDER BY media_id ASC ");?>
<div align="center" class="image_pal">
<? if (empty($image_pal['media_url'])) {?>
<img src="themes/<?=$setts['default_theme'];?>/img/system/noimg.gif" name="image_pal" width="600" />
<? } else {?>
<img id="myimage" src="thumbnail.php?pic=<?=$image_pal['media_url'];?>&w=600&sq=N" border="0" alt="<?=$item_details['name'];?>" name="image_pal" />
<? }?>
</div>
<div class="list_carousel_img" align="center">
<ul id="small_img">
<? while($image=mysql_fetch_array($sql_image)){?>
<? $ad_img=$image['media_url'];?>
<li class="small_img">
<a href="thumbnail.php?pic=<? echo $ad_img;?>" onmouseover="showImage('thumbnail.php?pic=<?=$image['media_url'];?>&w=600&sq=Y')"class="lightbox" rel="thumbnail_images" ><img src="thumbnail.php?pic=<?=$image['media_url'];?>&w=60&sq=Y" border="0" alt="<?=$item_details['name'];?>"/></a>
</li>
<? } ?>
</ul>
<div class="clearfix"></div>
<a id="prev_img" class="prev_img" href="#"></a>
<a id="next_img" class="next_img" href="#"></a>
<? if ($setts['lfb_enabled'] && $setts['lfb_auction']) { ?>
<div><img src="themes/<?=$setts['default_theme'];?>/img/pixel.gif" width="1" height="5"></div>
<? include("scripts/scroller/show_rep_details.php"); ?>
<? } ?>
I'm having trouble with jQuery Selectors. I have looked all over the web, spent many hours, but with no joy.
This is the site i got the Image Power Zoomer v1.2 from:
dynamicdrive.com
Question #2
Like i said im a newbie but i think my problems here jQuery selector these are some examples but i do not know what i need to add from my code
<script type="text/javascript">
jQuery(document).ready(function($){ //fire on DOM ready
$('img.showcase').addpowerzoom() //add zoom effect to images with CSS class "showcase"
$('#gallerydiv img').addpowerzoom() //add zoom effect to all images inside DIV with ID "gallerydiv"
})
</script>
What do i need to add here
$('????????????').addpowerzoom()
Thanks For all your help

jQuery(document).ready(function($){ //fire on DOM ready
==>
$(document).ready(function(){ //fire on DOM ready
Unless you changed your jQuery selector, this is the default

Because you asked another question in the answers (and even got an upvote?)
What do i need to add here
$('????????????').addpowerzoom()
This is my answer to that question:
$("img").each(function(){
$(this).addpowerzoom();
});
like in this demo: http://jsfiddle.net/u7w0ppq9/ with adding class instead of powerzoom (I do not have that library so, but it's basically the same)

How to Combine the Condition of PHP and CSS with JavaScript

I made a page for the mobile version. I made a condition based on the title and the size of the screen. Here is the condition :
If the Title > 17 characters and screen size < 392px
then do:
.postContent img {
bottom: 65px;
}
else and screen size > 391px
.postContent img {
bottom: 50px;
}
Here is image preview : http://i.imgur.com/59IG7UG.png
(sorry, i need at least 10 reputation to post image)
The first article should position the picture as the image to the second article.
How to combine PHP and JavaScript to change CSS :
<?php if (strlen(trim($post->getTitle())) > 17): ?>
<script type="text/javascript">
//do something
</script>
<?php else: ?>
<script type="text/javascript">
//do something
</script>
<?php endif; ?>
I have read this : PHP conditions depending on window width (media queries?)
but don't know how to implemented it.

Maybe try to add class to your .postContent? By printing it into div with PHP.
<div class="postContent <?php
if (strlen(trim($post->getTitle())) > 17) print 'bot65';
else print 'bot50'; ?>
">
// content
</div>

Ajax WordPress post popup with SimpleModal and jQuery

I tried to implement this mode here http://wordpressthemescollection.com/ajax-wordpress-post-popup-with-simplemodal-and-jquery-488.html but nothing seems to work.
This is what I do.
1 / Include in header
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.9.1/jquery.min.js"></script>
<script type="text/javascript" src="<?php bloginfo("template_url"); ?>/js/jquery.simplemodal.js"></script>`
The links are goods cause I checked them both.
2 / Include in header this script
<script>
jQuery(document).ready(function() {
jQuery('a.postpopup').live('click', function(){
var id = jQuery(this).attr('rel');
jQuery('<div id="ajax-popup"></div>').hide().appendTo('body').load('<?php bloginfo('url')?>/ajax/?id='+id).modal({
opacity:90,
position: ["0%"],
overlayClose:true
});
return false;
});
});
</script>
3 / Make a custom template with this code
<?php
/*
Template Name: Ajax
*/
?>
<?php
$post = get_post($_GET['id']);
?>
<?php if ($post) : ?>
<?php setup_postdata($post); ?>
<div class="whatever">
<h2 class="entry-title"><?php the_title() ?></h2>
<div class="entry-content">
<?php the_content(); ?>
</div>
</div>
<?php endif; ?>
And after that made a page named Ajax and assign the template Ajax.
4 / Implement a link
this link
If i click on the link nothing happens.
What did I do wrong cause I did not have a clue about it?
Thanks.

jQuery .load() is ajax and so you need to do any subsequent things in a callback like this:
var $ajax-div = jQuery('<div id="ajax-popup"></div>').hide().appendTo('body');
var url = '<?php bloginfo('url')?>/ajax/?id=' + id;
$ajax-div.load(url), function() {
// the callback
jQuery('#ajax-popup').modal({
opacity: 90,
position: ["0%"],
overlayClose:true
});
});

when you create an new post or page content on wordpress admin, select the "Ajax" template for your page