Jump to content
  • Announcements

    • boen_robot

      Guidelines and Netiquette   03/28/2017

      Posting Problems:   Having problems posting your topic? Read through this: To join, you agree to our terms and conditions and fill out and submit a registration form. An activation email will be sent to your email adress, so you'll need to verify your account. After that the account has to be validated by one of the moderators. This will mean that it can take up to a day to be activated. A couple of things to remember to ensure approval: Don't use an email address in one of those $2 four character .com domains eg. xyds.com. These will be deleted and the domain added to the banned list. Don't use an email address that is within a domain with a bad reputation for spam. A Google search is run on every email address and email domain. Don't sign up with an email address that doesn't exist, doesn't work or requires the sender to answer a quiz before their email can get to you. Put your country and or state and city in the signup form. Blank forms will go to the botton of the "to do" list. And make sure that your email address and your country match, saying you're from Alabama and using a .ru email address is not going to get you activated. After a membership is activated the first few posts will be monitored. Posting spam or unapproved topics described in the agreement results in an immediate ban. The email provider and the IP addresses associated with the account will be banned and all posts will be deleted. These strict measures have been deemed necessary to hinder spam. Sorry for any inconvenience this causes, but it's not liable to change. If, after reading this, you still can't post and don't understand why, contact one of the Moderators listed here.   Topic Guidelines   Including the following information can expedite an accurate response from board members: Must be a Specific Problem or Question related to web design and development Include Code in Question (wrap with   for small blocks of code and for longer blocks   ) Include Code Author Include Extra Notes/Modifications/Attempts Include web link to page/file when possible Content Guidelines   You may not post, upload, link to, or email any Content that contains, promotes, gives instruction about, or provides prohibited Content. Prohibited Content includes any Content that breaks any local, state, county, national or international law. Prohibited Content also includes: No direct or indirect advertising or websites, forums, products, services No hijacking of posts (do not post your question in someone elses) Content that infringes upon any rights [ex. MP3s and ROMs] (including, but not limited to, copyrights and trademarks) Abusive, threatening, defamatory, racist, or obscene Viruses or any other harmful computer software False Information or libel Spam, chain letters, or Pyramid schemes Gambling or Illicit drugs Terrorism Hacking or cheating for internet/online games Warez, Roms, CD-Keys, Cracks, Passwords, or Serial Numbers Pornography, nudity, or sexual material of any kind Excessive profanity Invasive of privacy or impersonation of any person/entity Hacking materials or information Posting Tips   There are more BBcodes than there are buttons for on the reply menu. To get the full list, click "BB Code Help" underneath the clickable smilie face menu. Use   for small snippets of code Use   for lengthy snippets of code Use   if your snippet is HTML (optional) Use   if your snippet is SQL (optional) Rules of Conduct   Be nice. There's no need for calling someone stupid if they ask an 'easy' question. Keep your avatars and signatures absolutely child friendly. We have a younger audience on this forum. Keep your language appropriate for the same reason above. Do not PM moderators for help on the forum. Post on the topic, or create a new one.   Spam:   Recently, as you have all without doubt noticed, we have had lots of spam and advertisement on the forum. Therefore, we'd like to alert you as to what to do when you have found any of the aforementioned annoying messages: it. Immediately. Give a clear reason, please, if the advertising is not evident. DO NOT POST! Report, let the post stay as is, and we will get to it, meanwhile if you continue to post as normal in the other threads, it won't be on the top so long. Refrain from PMing the member. This won't help at all, as they are most likely spambots anyway. Thank you.       Images in signatures:   After thinking of users on dial-up, we have decided to enforce the following rules regarding signatures. Please pay heed to them. Respecting these rules is respecting the members on this forum with dial-up. Signature rules: No animated images AT ALL. No matter the amount of animation. Maximum image widthxheight: 300x150 Maximum image (file) size: 15kb Use calm colors. Do not use highly contrasting images in your signature, as this can get really annoying when seeing several posts from one member in the same thread. The same prohibited content goes for images as for posts. Lastly, use common sense. No lengthy signatures please. Save us some scrolling. Thank you.       Links in signatures:   Please understand that w3schools.com only exists because of voluntary work and is barely supported by the advertising littered throughout the tutorials and the forum. So, please, stop advertising other sites. DO not post links that drive traffic away from the w3schools domain - especially to a site that offers similar if not identical information. Please help support the site by keeping individuals on it. Thank you. Here are some guidelines as to what you can put in your signature: w3schools links --> allowed w3.org links --> allowed browser links --> allowed html editor links --> allowed personal sites --> allowed tutorial sites competing with w3schools --> NOT allowed sites completely irrelevant to webprogramming and this forum --> NOT allowed   Thanks for understanding, and for taking the time to read this. ~W3Schools Modstaff~
raldje

refresh image each 10 secondes

Recommended Posts

raldje    0

Hi,

first sorry for my english, i'm french

i got a table in my database to announced events with this fields: id, event_date, announce, image.

I want to make a header with images changing each 10 secondes, but i don't want to refresh all the page.

 

This is what i use actually:

$rst = $bdd->query('SELECT image from matable order by Rand() LIMIT 0, 1');
while($donnees = $rst->fetch())
{
$image = nl2br($donnees['image']);
if (empty($image)) {
echo '<img src="imagedefaut.jpg" />';
}
else {
echo '<img src="image/'.$donnees['image'].'" alt="image"/>';
}         
}
$rst->closeCursor();

I know i have to use some javascript with setInterval but i don't know how to do.

Can i have some help, please.

Share this post


Link to post
Share on other sites
john_jack    7

here is an eg :

<img src="./01.png" id='img1'/>
<img src="./02.png" id='img2'/>
<script>

var x=1;
        var myVar = setInterval(myTimer, 1000);

function myTimer() {
   if(x%2==0){
	document.getElementById("img1").style.display = "none";
	document.getElementById("img2").style.display = "block";
        x=1;
		}
	else{
	     document.getElementById("img2").style.display = "none";
	document.getElementById("img1").style.display = "block";
	x=2;
	}	
}
</script>

all you have to do is get some images and set the SRC path to the right location .

Share this post


Link to post
Share on other sites
dsonesuk    701

You can use ajax to call the same php code, but replace the current with new targeting its parent container element, that way if javascript is disabled the original php code will run.

Share this post


Link to post
Share on other sites
raldje    0
$rst = $bdd->query('SELECT image from matable order by Rand() LIMIT 0, 1');
while($donnees = $rst->fetch())
{
$image = nl2br($donnees['image']);
echo '<img src="defaultimg.jpg" alt="image_by_default" id="img1"/>';
echo '<img src="image/'.$donnees['image'].'" alt="image" id="img2"/>';
}
$rst->closeCursor();

<script>

var x=1;
        var myVar = setInterval(myTimer, 1000);

function myTimer() {
   if(x%2==0){
	document.getElementById("img1").style.display = "none";
	document.getElementById("img2").style.display = "block";
        x=1;
		}
	else{
	     document.getElementById("img2").style.display = "none";
	document.getElementById("img1").style.display = "block";
	x=2;
	}	
}
</script>

When i load the page i see 2 images and after 1 second, it's working.

But it's only switch beetween default_img and first event image, i got several events with image in my table.

 

 

You can use ajax to call the same php code

I realy don't know how to do this.

Edited by raldje

Share this post


Link to post
Share on other sites
raldje    0
$rst = $bdd->query('SELECT image from matable order by Rand() LIMIT 0, 1');
while($donnees = $rst->fetch())
{
$image = nl2br($donnees['image']);
echo '<img src="defaultimg.jpg" alt="image_by_default" id="img1"/>';
echo '<img src="image/'.$donnees['image'].'" alt="image" id="img2"/>';
}
$rst->closeCursor();

<script>

var x=1;
        var myVar = setInterval(myTimer, 1000);

function myTimer() {
   if(x%2==0){
	document.getElementById("img1").style.display = "none";
	document.getElementById("img2").style.display = "block";
        x=1;
		}
	else{
	     document.getElementById("img2").style.display = "none";
	document.getElementById("img1").style.display = "block";
	x=2;
	}	
}
</script>

When i load the page i see 2 images and after 1 second, it's working.

But it's only switch beetween default_img and first event image, i got several events with image in my table.

 

 

You can use ajax to call the same php code

I realy don't know how to do this.

Share this post


Link to post
Share on other sites
dsonesuk    701

Place all required code to produce random image using html img tag in a php file.

 

Look at this http://www.w3schools.com/ajax/tryit.asp?filename=tryajax_first you are basically replacing the paragraphs from the text file with your random img tag produced with your php file.

 

But instead running ajax code on button click you run it using setInterval.

Share this post


Link to post
Share on other sites
raldje    0

I'l try to explain with more precision.

In my table i have several entries of event, some with image, some without

I also have an image by default .

I try to make a header with all the present images in my table switching every 10 seconds, or my image by default if no event or only events without image.

Edited by raldje

Share this post


Link to post
Share on other sites
sandeepm    0

this code is help full to you check once

 

Initially you can save all images in one variable then,

 

$(document).ready(function()
{
window.setInterval(function(){
countdown();
}, 1000);// every one second
});

 

function countdown() {

// build your logic to get random images from that variable

}

Share this post


Link to post
Share on other sites
dsonesuk    701

create php file that holds random image php script from database

 

random_image.php (note i created a quick connection to database images which is probably not setup as yours).

<?php

$db_host = 'host';
$db_user = 'user';
$db_pwd = 'password';

$database = 'whatever';


$bdd = new mysqli($db_host, $db_user, $db_pwd, $database);
// Check connection
if ($bdd->connect_error) {
    die("Connection failed: " . $bdd->connect_error);
}
$rst = $bdd->query('SELECT image from matable order by Rand() LIMIT 0, 1');

   while ($donnees = $rst->fetch()) {
    $image = nl2br($donnees['image']);
    if (empty($image)) {
        echo '<img src="imagedefaut.jpg" />';
    } else {
      
        echo '<img src="image/'.$donnees['image'].'" alt="image"/>';
    }
}
$rst->closeCursor();

Now we include this file in the page that uses this random image script to produce your current setup, this will always produce a random image on loading of page whether js disabled or not.

<!DOCTYPE html>
<html>
    <head>
        <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
        <meta name="viewport" id="viewport" content="target-densitydpi=high-dpi,initial-scale=1.0,user-scalable=no" />
        <title>Ajax random image</title>
        <script type="text/javascript">

            window.onload = function() {

                window.setInterval(function() {
                    show_random_Image();
                }, 10000);
            }

            function show_random_Image() {
                var xhttp = new XMLHttpRequest();
                xhttp.onreadystatechange = function() {
                    if (xhttp.readyState == 4 && xhttp.status == 200) {
                        document.getElementById("random_image_wrap").innerHTML = xhttp.responseText;
                    }
                };
                xhttp.open("GET", "random_image.php", true); //note path to script may need amending
                xhttp.send();
            }
        </script>


        <style type="text/css">

        </style>
    </head>
    <body>
        <div id="random_image_wrap">
            <?php
            include ('/random_image.php'); // include random image script to you produce current random image effect note path to script may need amending
            ?>
        </div>

    </body>
</html>

Now the JavaScript ajax script will run at 10 sec interval on loading of page a connection to random_image.php it will retrieve the content produced by that php script and insert it into the element with id reference of 'random_image_wrap' overwriting the current image that is in there, without reloading of the page.

Edited by dsonesuk

Share this post


Link to post
Share on other sites
dsonesuk    701

With php you could create a JavaScript array of all your images, then use JavaScript to select a random number between 0 and total number of images in array minus one (array index start at 0) then use this random number as a index ref of the image to use.

Share this post


Link to post
Share on other sites
dsonesuk    701

Learn how to create a js array to store images, learn how to create a random number within a given range, then learn how to create JavaScript array using php to echo img files names into the js array.

Share this post


Link to post
Share on other sites
raldje    0
<?php
$stmt = $bdd->query('SELECT image FROM matable');
$donnees = $stmt->fetchAll();
var_dump($donnees);
$images = $donnees['image'];
echo '<img src="image/'.$images.'" id="my-image" />';
?>
  
<script type="text/javascript">
    var imgs = new Array(
        <?php
        for ($i = 0; $i < count($images); $i++) {
            echo '"'. htmlspecialchars($images[$i]) .'"';
            if ($i < count($images) -1) {
                echo ',';
            }
        }
        ?>
    );
    var position = 0;
    var taille = imgs.length;
    var image = document.getElementById('my-image');
    changeImage = function() {
        position = (position+1 >= taille) ? 0 : position+1;
        image.src = imgs[position];
        setTimeout(changeImage, 1000);
    }
    changeImage();
</script>

I think it's something like that but it don't work.

Share this post


Link to post
Share on other sites
dsonesuk    701

Unless the image array img src contains the path also as in 'image/' it will replace img src with 'myimage.jpg' instead of 'image/myimage.jpg;

 

and shouldn't this

 

$donnees = $stmt->fetchAll();

 

be

 

$donnees = $stmt->fetch_all();

 

 

Also with the way you are accessing the img src it should be more like $images[$i][0] ?

Share this post


Link to post
Share on other sites
john_jack    7

you can also use the image directory to lest images from

<div id="mypic"></div>
	 <script>
	   var myVar = setInterval(myTimer, 1000);
	  var images = [];
      <?php 
	  
	  // set $dir to your image directory
	  $dir = "./res/images/";

// Open a directory, and read its contents
if (is_dir($dir)){
  if ($dh = opendir($dir)){
    while (($file = readdir($dh)) !== false){
	 if (!is_dir($file))
	 {
	  ?>
	  //fill up the JS array with php values
	  images.push("<?php echo  $file; ?>");
	  
	 
	   <?php
	   }    
	}
    closedir($dh);
  }
}

  
?>

function myTimer() {
   var tt=Math.floor((Math.random() * images.length) + 1) - 1;
	document.getElementById("mypic").innerHTML  = "<img src='./res/images/" + images[tt] + "'>";
	
	
}
 
	 </script>
	 

Share this post


Link to post
Share on other sites
Ingolme    794

MySQLi uses fetch_all() while PDO uses fetchAll(). Personally, I prefer PDO.

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now

×