How to scroll through an array of pictures with PHP and Javascript
Question
I have a sql query that pulls an array that contains file paths to my images.
It is store in the variable $rows and I can access individual paths by indexing throught...
IE.
$rows[0]...$rows[n]
How can I utilize java script to step through this.
Final goal is for the picture to appear with a "Next" "Previous" button under it. Hitting next would show the next image (without a refresh)
echo $rows[0];
would print
images/a.png
3 answers
solution1
1 ACCPTED 2012-12-19 19:04:07
Maybe using PHP's json functions you can convert your PHP array to a js array... and then use javascript functions to control which picture to show
<script type="text/javascript">
var images = <?php echo json_encode($rows) ?>, counter = 0;
function prevImage() {
counter = (counter<=0)?images.length-1:counter-1;
var i = document.getElementById('myImage');
i.src = images[counter];
}
function nextImage() {
counter = (counter==images.length-1)?0:counter+1;
var i = document.getElementById('myImage');
i.src = images[counter];
}
</script>
and
<img src="img/0.jpg" id="myImage" />
<a href="#" onClick="prevImage(); return false;">Previous</a> - <a href="#" onClick="nextImage(); return false;">Next</a>
solution2
0 2012-12-19 18:35:28
Here is a little example to move your php array to a javascript array:
<?php
$row = array("image/image1","image/image2","image/image3");
?>
<html>
<head>
<title>Sample Array</title>
<script>
var jsArray = new Array();
<?php
for ($i=0; $i<3; $i++)
{
echo "jsArray[$i] = '$row[$i]';";
}
?>
for(i = 0; i < jsArray.length;i++)
{
alert(jsArray[i]);
}
</script>
</head>
<body>
<span>Sample Array</span>
</body>
</html>
Good luck!
solution3
0 2012-12-19 18:45:03
Get your PHP array (server-side) to Javascript (clientside)
There are quite a few ways to go about doing this, but I'd recommend JSON . It has numerous advantages, but the most obvious one is you can store arrays and javascript objects as a string. If you're not familiar with it, this would be an excellent time to start including it in your workflow, considering you have to deal with Javascript.
PHP
Turn Array to JSON:
$jsonResults = json_encode($arrayOfResults);Get JSON from PHP to Javascript:
<script> var myAppsData = {}; myAppsData.slideshowJSON = JSON.parse($jsonResults); </script>
Now your JSON object is accessible to Javascript at myAppsData.slideshowJSON .
The rest of the work is as simple as iterating through the object with a for loop (just like you would in PHP), grabbing the content and doing what you want with it.
Cheers!
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