<?php
//stuff
?>
<html>
<head>...header stuff...</head>
<body onLoad="start_my_script ();">
.
.
. //get values from php.
.
.
</body>
</html>
My php is getting a little like 3 to 4 secs. to load stuff.
So, its not getting passed in html.
is there any way I can put wait in onload till my php gets loaded.
PHP runs when you request the page, not when the page is in the browser. Thus, PHP will process everything, make the final page, and send it to the browser. There is no chance for the browser to wait for the page to load before calling PHP.
i'd load it asynchronous (jQuery) to address those issues. However, it would help if you specify what are you doing in your php script and how those results are used in the html document.
Related
Let us consider the following html :
<!doctype html>
<html>
<body>
<form method="POST" action="submit.php">
<input name="name" placeholder="Enter your name">
<button type="submit">Submit</button>
</form>
</body>
Now to my understanding this code passes a list of arguments to a the php file which is mentioned in the action attribute of the method .
I understand that the code file is in the server system .
Now let us consider the code for submit.php as follow :
<?php
$name = $_REQUEST['name'];
?>
<!doctype html>
<html>
<body>
Hello <?php echo $name;?>
</body>
</html>
These codes are taken from an answer to my last question .
Now after the submit button is clicked . The client requests for a new page from the server .
I wanted to know what exactly is happening here . Does the server sends this code file to the browser and the php code is executed in the browser or submit.php , generates an html file according to the php code in it and that html file is sent to the client ?
Where is the code getting executed in the browser or in the server . With what I have read till now gives a feel that the code is being executed in the server but to be just sure .
Further , if the case is like the latter , i.e., the inputs are sent to server and the server based on the php code generates an html file that is sent back to the browser , then isn't it a bit inefficient in sending requests the server even for smaller changes ?
So what exactly is happening and where is the code getting executed ?
The PHP source is on the server and remains there. It is executed there, and the result (which is typically HTML, but can be anything else too), is sent as a response to the browser, so you got that right.
The advantage is that the PHP code itself is hidden to to user, and it can do advanced stuff like accessing files and databases which are hidden, and usually unaccessible directly for your website visitor.
The PHP code may be accidentally exposed when PHP is not set up properly. In that case, the code won't run but may be returned as plain text by accident. If you ever see PHP code in your browser, it's almost certainly due to an incorrect server set-up.
Even a small change should usually be done by the server. Theoretically it's inefficient to do those requests all the time, but in reality a request is not a big deal. If you only want to update the page itself, without doing anything special to the server, you could use JavaScript which can run in the browser as part of your page, and which can manipulate the loaded HTML document.
The whole process or execution life cycle can be explained in the following two steps:
Step-1:
Server-side PHP blocks enclosed in <?php ?> tags are executed and removed from the code base on the server on every request.
Step-2:
Client-side script and HTML tags left in step-1 are send for execution and display in the browser.
I hope the explanation is easily understandable now.
Im tring to get php to load a webpage, wait for a minute, and load another page..
Problem is, php does not output the first page before sleeping and outputting the second page to the screen...
Here is my code:
<?php
header("Location: http://www.paylesstitleloans.com/");
sleep(60);
header("Location: http://www.paylesstitleloans.com/faq.html");
?>
Would using function like these help me at all:
ob_start();
ob_flush();
I need the first page to display on the browser before sleeping.. Any help would be great! Thank you. Jason
You need to use something on the client side (Javascript, meta refresh, iFrames) to accomplish this.
Relevant topics:
jquery function that load html code into a div and then load other content into div inside html loaded
You cannot user headers from php after the page has already loaded. But, you can use a meta tag to redirect after a certain amount of time. Please refer to the meta example below.
<meta http-equiv="refresh" content="60;url=http://www.paylesstitleloans.com/faq.html/" />
You can't do that with location in http headers because you only can send it once.
You'll have to use javascript for that with a timeout function.
including this script in first page would do the trick :
<script type="text/JavaScript">
<!--
redirectTime = "60";
redirectURL = "http://www.paylesstitleloans.com/faq.html";
function timedRedirect() {
setTimeout("location.href = redirectURL;",redirectTime);
}
// -->
</script>
I have a web application in php, I don't know which one will be ever called an processed first,
In my php file, I also have a javascript code
<script>
$(document).ready(function(){});
</script>
In my php code, I will send an array object into that javascript. So I wonder why the php code is executed first instead of the javascript ? Does it mean that all server code will always be executed before the client script runs during the browser view is shown.
The server side code is executed first and the output generated by server side is sent back to client where client side code is executed.
Yes, normally, the whole server processing finished before the page is delivered to the browser. At this moment, JavaScript execution starts.
You can add late execution of PHP code using AJAX.
Of course, the server code (be it PHP,ASP,JSP,etc) runs first in the server, it generates an html page which contains your javascript code, your computer receives this page, renders it in the browser and runs the javascript in it.
if you have html,php,js in a single file you should know these two things only:
1)your file extension must be .php (because php execution required .php extension)
2)you will see the output exactly in the same order as you typed in your file.
<html>
<body>
<?php
echo "i m php upper"."</br>";
?>
<p id="pg">i am html upper</br></p>
<script type="text/javascript">
document.write(" i am javascript upper</br>");
</script>
<?php
echo "i m php bottem"."</br>";
?>
<script type="text/javascript">
document.write(" i am javascript bottom</br>");
</script>
<p id="pg">i am html bottem</br></p>
</body>
</html>
...output looks like this...
i m php upper
i am html upper
i am javascript upper
i m php bottem
i am javascript bottom
i am html bottem
Here is what I'm trying to do...
$("div").prepend("<div id='comment-number'><?php the_comment_number(); ?></div>");
Is there some way to get this to work?
<div class="gallery-item">
<div class="comment-number"><!--?php echo htmlspecialchars(the_comment_number()); ?--></div>
</span>
<span class="gallery-icon">
<img src="http://mysite.com/test/wp-content/uploads/2011/06/fff-150x150.gif">
</span>
</div>
PHP is executed on the server, but JavaScript code (jQuery) is executed later, in the web browser. For that reason, PHP can produce JavaScript code, but JavaScript can't produce PHP code.
The <!--? in your posted output shows that something is filtering our your PHP code. So the problem isn't your PHP code, it's that you're not actually executing PHP code. If it's a .js file, PHP almost certainly can't be included.
If PHP were being evaluated (ex. if this were in a <script> tag in a .php file), this should produce valid JavaScript code that will do what you want:
$("div").prepend("<div id='comment-number'><?php echo htmlspecialchars(the_comment_number()); ?></div>");
1) php is SERVER side scripting
2) javascript is CLIENT side scripting (generally)
so this is what happens:
1) User opens up your page http://example/
2) Your CLIENT sends GET request to http://example/ server
3) Apache (given you run on it) captures the request, based on the server config approaches index.php (index.html, etc). If php is installed, your index.php will be parsed by mod_php module
<<<< this is where SERVER side scripting is activated
4) outcome of the parsing of index.php will be then transferred back to CLIENT
5) CLIENT will digest the outcome received by SERVER
6) If there are javascript calls, those are executed either immediately OR when document is loaded (based on approach)
That's it. Here normal request life ends.
NOW if you want your page to dynamically update some parts of it, here is how you do that:
1) Usually to update your page dynamically, you would use AJAX approach. When AJAX request is created, 2-7 happens again, but this time the caller is your ajax process and information which is received is sent back to that process to decided what to do with it.
Okay, some coding:
1) index.php
<!-- include jquery, etc //-->
<div id="comments"></div>
<script>
function fetch_comments(){
$.get("ajax.php", null, function(data)){
// this is called, when response from SERVER is received
$("#comments").prepend(data);
setTimeout("fetch_comments", 5000); // fetch again in 5 seconds
}
}
$(document).ready({
fetch_comments();
});
</script>
2) ajax.php
<?php
//fetch comments, return them for CLIENT
echo "<p>Comment on " . date("Y-m-d H:i:s") . "<br />Lorem Ipsum</p>";
This should help you understand the whole process. Did not test the code, but should be quite ok.
do a .ajax() query to PHP script that will provide you value of the_comment_number(); and put result to comment-number by $("#comment-number").prepend(result); on success event in ajax query.
Remebmer that PHP script have to have connection to database and pass to it all variables you need (like entity id, article id, page etc.). You can do it by GET or POST.
Request is sended by browser so session/cookies will be the same unless you changed it in current request.
PHP is executed on the server side so you cannot call it from javascript
You can try something like this which will render once the page loads
$("div").prepend("<div id='comment-number'>"+ <?php the_comment_number(); ?> +"</div>");
Couldn't you just add the value directly to the template instead of using javascriot? eg:
<div class="gallery-item">
<div class="comment-number"><?php echo (the_comment_number());?></div>
...
</div>
Also you have a </span> tag with out matching <span> tag in your example.
As already told, you can't produce or call php code from javascript directly(you need to make an ajax call or form submit). You need to make ajax call using jquery to fetch the comment number and then update it into div.
However, you may want to look at this library - http://www.phplivex.com/ .It may help you in doing things your way. It allows you to call user defined php functions in javascript using AJAX internally.
Reading through this disccussion and from what i understand you want to acheive.. You gotta figure how your page is served. If it is an .php file that is serving the content, then you wont need Javascript at all and could get your function call to work by adding the function between the div as so..
<div class="comment-number"><?php echo htmlspecialchars(the_comment_number()); ?></div>
Assuming you don't have access to the .php or if its a .html/htm page that serves the content then your only bet would be to use ajax. That is make an ajax call to a php file(on the same domain) that makes your function call and echos the comment no. The Ajax will retrieve the echo'd comment no. which you can append/prepend to the desired
I have a php script that is a bit of a mess and after a form entry, I need to get an address, and display it on a google map. The html and php is crammed into the same script so I essentially need to call the JavaScript as the PHP is happening. Is there a way to do this?
Thanks,
Alex
You can POST your from to a different frame (or iframe), so your page would not reload. The response of your PHP file which comes back to that frame can contain JavaScript code, which will be executed. Something like:
echo('<script type="text/javascript"> alert("Executed on client side"); </script>');
No, PHP executed by the server and returns the full response to the browser. JavaScript in the page is then executed by the client.
You can't call Javascript functions from PHP. You can set the Javascript to run when the page loads instead.
What you want is something like this:
<script type="text/javascript"></script>
var userAddress = "<?php echo $_POST['address']; ?>";
doSomethingWithAddress(userAddress);
</script>
If that code is on the page which you are POSTing the address to, it would take the address from the user, and write it into a javascript tag. The PHP will get executed first on the server, before building the HTML document. This new document has the variable available to the javascript.
I don't know how you would go about doing that, but this seems like a good place to start looking:
http://code.google.com/intl/en/