I want to call a PHP function passing an argument on clicking a hyperlink (text with <a> tag) on the same page, i.e. href='#' onclick='loadpic($id).
Where $id is the variable to be passed to PHP function.
You can do that by ajax easily. Create a loadpic function in javascript instead and then pass $id to the php file via ajax and do something when you get the result.
Your javascript file should look like this-
(make sure you've inserted a link for jquery in your index file)
function loadpic(id_param){
$.post("filename.php",
{
id: id_param
},
function(data){
alert("Data received:" + data);
});
};
The data parameter in function(data) would be the value that you've echoed in the php file.
If you want to use onclick() method in your HTML element then you have to write your method is javascript and make an AJAX call to PHP. THis is one simple way to do this using php and javascript. And for this please see javascript and ajax with PHP.
But if you dont want to use javascript then here is a simple way and very simple code.
<?php
if(isset($_GET['myMethod'])){
myMethod($_GET['id']);
}
function myMethod($id){
echo $id."<br>";
}
?>
<?php
$myId = 4;
?>
<a href="index.php?id=<?php echo $myId ?>&myMethod" >MyLink</a>
Note: Copy this code and paste into a file called index.php because notice the hyper link tag and its attribute href="index.php".
Also note that you can not directly call php method using js like onclick() from your HTML tag. You should use AJAX or something. But using above demo code you can easily call myMethod() which is a PHP method using the hyper link tag.
In your case:
<?php
if(isset($_GET['call_loadpic'])){
loadpic($_GET['id']);
}
function loadpic($id){
echo "My loadpic method has been called! and the id is".$id."<br />";
}
?>
<!-- your other codes -->
<?php
$id = 4;
?>
<a href="this-same-file-name.php?id=<?php echo $id ?>&call_loadpic" >MyLink</a>
This is because your php function is in the same page and you want to call that function using same file and hyperlink in the same file. (According to your question)
You still will have to make javascript handle the exception because php has no onclick.
onClick=\"loadpic("'.$id.'");"\
//this will only send a php variable javascript will still have to loadpic();
Related
So I have a piece of javascript code in an html document that responds to a button click. I want a new url to open, and if I specify the link in javascript as I've done below, everything works fine.
<input type="submit" id="submitbtn" value="Purchase Module"/>
<script type="text/javascript">
document.getElementById("submitbtn").addEventListener("click",handle_click);
function handle_click() {
var link;
link="http://www.google.com";
window.location.href=link;
}
</script>
Problem is I want to hide the real link on the server side as it includes a username:password. The php script below calls a function (not shown) that generates the link (a string). This also works fine.
<?php
$link=get_page_link();
?>
I want to pass the link string to the javascript and have tried various iterations of
link=<?php echo $link ;?> to no avail. As I understand it you can't pass strings this way and you need to use ajax. That's where I'm stuck. Seems like I need a $_POST on the php side and a $_GET on the java side, but not sure on the specifics. Any help would be appreciated. Thanks.
I am trying to insert html and javascript which is generated in php into a div in the page.
a.php file:
function get_preset() {
return (bunch of html, javascript);
}
b.php:
<div id="preset_preview">
//<?php echo get_preset(); ?> //this works well, but I need to execute this every time I click a button in jquery.
</div>
I can use ajax to communicate between my jquery and a.php successfully, but how do I place returned content from get_preset function call in php into preset_preview div?
Is there a way to do this without sending data with ajax from get_preset function call into jquery, then use jquery to put this into preset_preview div?
Can php somehow do it alone each time on request from jquery like this?
So I use jquery ajax to call php to execute this:
<div id="preset_preview">
<?php echo get_preset(); ?>
</div>
What is confusing to me is that php can do it successfully (as example above demonstrates) without sending data with ajax to jquery first.
a.php file
function get_preset() {
return (bunch of html, javascript);
}
echo get_preset();
b.php file
<button type="button" id="preview">Preview Preset</button>
<div id="preset_preview">
<?php include "a.php"; ?>
</div>
<script>
$('#preview').on('click', function(e) {
e.preventDefault();
$("#preset_preview").load('a.php');
});
</script>
There are several methods of jQuery AJAX which you can actually use. Example above is using load() which wraps your request with get method (you can override its request method by calling ajaxSetup(), anyways) to relative URL of a.php.
You can see a.php echoing (string of?) get_preset() function which will then placed inside <div id="preset_preview"> in b.php file.
To expand the needs of AJAX in this case is because PHP only does something like
Getting a request, no matter what the method is (get, post, put, etc)
Returns a response. Usually after you do some logic related to request value.
It dies whenever your expected response rendered to client side. You can't do anything magic behind the wall right after response is returned. In the other word, a page load is needed.
And then AJAX comes to help you create another request to corresponding PHP file. It revives a PHP file to do (another) request -> do some logic -> then do returning it. Silently, without a page load.
And in respond of comment -- Can this be done with function calls somehow without including the actual php file in preset_preview?
It's all yes. As long as you serve whatever the caller needs.
a.php file
function get_preset() {
return (bunch of html, javascript);
}
echo get_preset();
The a.php is simply echoing get_preset().
b.php
<button type="button" id="preview">Preview Preset</button>
<div id="preset_preview"></div>
<script>
$('#preview').on('click', function(e) {
e.preventDefault();
$("#preset_preview").load('a.php');
});
</script>
The b.php file is simply doing a request to a.php file. Whenever the button with selector id #preview is clicked it will load whatever a.php content to #preset_preview.
You can also render the content of a.php just after the page ready. This is similar approach like my first snippet as written on above.
<script>
$(document).ready(function() {
$('#preset_preview').load('a.php');
});
$('#preview').on('click', function(e) {
e.preventDefault();
$("#preset_preview").load('a.php');
});
</script>
It simply tells you that you should load a.php right after the b.php page is ready and "reload" it once the button clicked.
In a php file I have tags with dynamic id's.
Example:
<ul id="<?php echo 'ul_'.$xx; ?>">
<li id="test_li">...</li>
</ul>
In a separate JavaScript file I am wanting to use the load function and target that div.
$('<?php echo 'ul_'.$xx; ?>').load('../includes/myphpfile.inc.php #test_li');
My question is, how could I load that php within a JavaScript file?
Notes:- The reason I have it set up this way is due to looping multiple ul's. I just want my ajax file to refresh the li's within the specific ul I am inside of.
Edit: If I use classes instead of Id's it adds my newly inserted rows into all of the ul's with the same class. If I use a plain Id it only works on the first ul. Further explaining why I need to target the way I am.
Unable to find a solution using the path I was on, I looked for alternate methods. Worked out I could add the event in the php file on the submit form button click.
The reason I wasn't using this method at first was because the code was running before it submitted to the DB and therefore was always behind in relation to the new data being submitted.
To my surprise I fixed this by just duplicating the line of code.
<script>
$("<?php echo '#enter_submit_button'.$linkid ?>").click(function(){
/*1*/
$('#<?php echo 'ul__'.$linkid; ?>').load('../includes/pursuit.inc.php <?php echo '#li__'.$linkid; ?>');
$("<?php echo '#insert_new'.$linkid; ?>").fadeOut();
/*2 with delay*/
$('#<?php echo 'ul__'.$linkid; ?>').delay( 800 ).load('../includes/pursuit.inc.php <?php echo '#li__'.$linkid; ?>');
});
</script>
I honestly couldn't say exactly why this works but the logic behind trying the method came from hoping that the double load would pick up the latest submission.
The simplest answer would be to put your JavaScript code into the PHP file inside
<script></script> tags, i.e, just before closing your <body> tag, do this:
<script type="text/javascript">
$('<?php echo 'ul_'.$xx; ?>').load('../includes/myphpfile.inc.php #test_li');
</script>
But if you must use an external js file, then you could do this:
Create a (.php) file and write:
<?php
header("Content-type: application/javascript");
?>
// your js code with php inside (as you would do in HTML)
var othervar='<?php echo $phpVar; ?>';
//<?php //some php ;?>
Then, in your main (html/php) file, put in:
<script src='myjs.php' type='application/javascript'></script>
Hope that solves it.
Thanks for all the answers, seems like AJAX is the solution, I'll give it a try. But what about JSON? Isn't JSON an even better solution? If it is, why is AJAX more preferable?
I'm looking for a way to update this part of php code every 5 seconds, which would regenerate this bootstrap list group. what would be a good way to do it? I figure I couldn't just wrap it in window.setInterval, and refreshing the entire page is not an option. Thanks in advance.
<?php
$i=0;
// Display all room
foreach ($rooms as $room) {
$room_num = $room['room_num'];
$room_type = $room['room_type'];
$note = $room['note'];
echo '
<a class="list-group-item" >
<h4 class="list-group-item-heading" id="room_num' .$i. '" ><p>'.$room_num." - " .$room_type.'</p></h4>
<p class="list-group-item-text" id="note' .$i. '" ><p>'.$note.'</p></p>
</a>
';
$i++;
}
$rooms = "";
getList();
?>
All on the same 'page.php'
php part:
<?
if ($_POST["whatever"])
{
echo 'your shizzle here'
exit;
}
?>
Javascript part: (with jquery)
<script>
setInterval(function()
{
$.post( "page.php", { whatever: 1}, function( data ) {
document.getElementById('someid').innerHTML = data;
});
},5000);
</script>
html part
<div id = "someid"></div>
Another way to do it could be using an iframe :) But iframes won't be used in the future I think.
Basically when you write php code inside javascript, it always run once, when the page is loaded. After this you just writing php code to the browser which is simply do not understand (Php is processed on the server, and the output is Html, Css, and Javascript, which the browser can interpret)
So, if you need to update data from the server without reloading the page, the only way to do this is with Ajax Requests, that basically connect to the server within the page and get data from it.
In your case, Save the PHP code which ever you want to execute in a file say php_temp.php
Now just do
setInterval(function(){
$.get("php_temp.php", function(data){
console.log(data) // data stores whatever php_temp.php echoes
});
},5000);
more on Ajax: Ajax Basics
This IS a duplicate from Calling a php function by onclick event, but I have a question on it. The answer I had a question on is by timpanix, and basically it won't work.
He said to execute some PHP code in a On Click event do this:
onclick="document.write('<?php //call a PHP function here ?>');"
and call the PHP function. Yet whenever I try it:
<button id="profileinformationbutton" input type="submit" value="Login" onclick="document.write('<?php profileupdated() ?>');"> Update Profile </button>
it prints out ');" > Update Profile, yet I have no clue why. It is inside of a form, and the PHP function looks like this:
<?php
function profileupdated() {
?>
<div id="profileupdated"> Profile Updated </div>
<?php
}
?>
Why would the code be displaying this? Please help! :) Thank You.
EDIT
The code does not seem to be writing Profile Updated to the page, any idea why?
function profileupdated() {
echo "<div id='profileupdated'> Profile Updated </div>";
}
Also if you only want to print this value to your tag why you're using function? Assign it to a variable.
like
$myVar = '<div id="profileupdated"> Profile Updated </div>';
Then use this variable where you want?
you should echo or return your function body. Carefull! I changed quotes!
Your PHP function is writing to the page already, rendering the document.write (javascript) useless. Try this:
<?php
function profileupdated() {
return "<div id='profileupdated'>Profile updated</div>";
}
?>
I do want to note though that you might want to consider a cleaner way of doing this: If you just want to display a fixed text ("Profile updated"), stick to pure client-side Javascript.
Otherwise (if there's logic to be done server-side), you might want to decouple server and client and use an AJAX call and JSON to transfer your data.
PHP is a server side programming language, you are executing the JavaScript on the client side.
If you want to call a PHP script from your JavaScript you need Ajax, f.e. jQuery.