JavaScript do while statement : Example-1

javascript within php loop

Is it possible to run javascript code within a php loop? the javascript works perfect the problem is that it is currently not executing more than once.

while(. ) < $l=$l+1; $linha="#x".$l; $linha2="x".$l; ?>  > 

First, you can’t «run» javascript code within a PHP loop because PHP is server side and javascript is client side. You can generate JS from PHP — is this what you mean? Secondly, please show what you are expecting as output, and what you are getting. Also, please show us what the continue condition of the while loop is in PHP.

OK, please show us the table, what you want to do with it, and what you are getting at the moment. Please edit the question with the HTML that is being generated at the moment, and what you would like it to be.

what i am getting is the additional information from the first guy for every one. I’m sorry but what is the difference between javascript and JS? I would like to try with JS

2 Answers 2

Yes you can output javascript within a PHP loop, to be executed by the browser, when the page loads.

The problem here is that you’ve got tons of variables colliding. You need to encapsulate each output of that script tag in order to keep that from happening. Here’s one suggestion:

  (function($) < var mensagem = "", , nextMsgOptions = < msg: mensagem, side: "bottomMiddle", CSSClass: "nextMsg-LightTheme" >; $(document).ready(function() < $(id).click(function()< $(id).nextMsg(nextMsgOptions); >); >); >)(jQuery); 

This keeps each $linha and $mensagem variable scoped away from each other for each iteration of the loop. What I think is/was happening is in your old code, you’d set $linha to some variable, and output id = however many times your loop executed. When $(document).ready() executed for each output, $linha had already been interpreted to be the last value that you loop output. This caused document.ready to attach an event N times (N = number of iterations of your while loop) to the same DOM element (whichever the last iteration of your while loop output $linha to be). With the above snippet, it keeps each id and $linha variable scoped away and private from each other, so you shouldn’t have to worry about collisions.

I realize that explanation is kind of convoluted and might be hard to grok; but javascript interpretation/execution/scoping has special rules that aren’t incredibly simple to convey without examples.

Источник

Pass PHP variable from while loop to javascript function

Before anyone says «try searching», I have — I realize this is probably a simple solution, but I just can’t get it to work. This is my first venture into AJAX — and my knowledge of javascript is slightly above a 1st grader. I know I need to get up to speed on it. I’m trying to build a nested task manager, using AJAX. I’m getting jammed up on the AJAX implementation. the list works well otherwise. The basic concept should output like this:

Goal: Create a nested task list Milestone: Build the basic setup — completed 2/11/12 Task: Design the database — completed 2/11/12
Task: Design the php stuff — completed 2/11/12

As you click on the link, it runs my MySQL update to show the item being completed. I have three nested while loops (one for goals, one for milestones and one for tasks). They are near identical. Here’s the most deeply nested loop:

$query_tasks = mysql_query("SELECT * FROM task WHERE task_gid = '$task_gid' AND task_mid = '$task_mid' AND task_tid IS NOT NULL"); $t_numrows = mysql_num_rows($query_tasks); if($t_numrows > 0) < while( $get_task = mysql_fetch_array($query_tasks))< $task_id = $get_task['task_id']; $task_goal = $get_task['task_goal']; $task_due = $task_task['task_due']; $task_due = date("m/d/Y", $task_due); $task_complete = $get_task['task_complete']; $task_complete_date = $get_task['task_complete_date']; ?>

I’ve got it to work for one link (if I click on the last rendered link, it works as desired — but no other links do). I’ve tried calling the javascript in the head (my preferred method) as well as calling it each time the loop passes (not sure that’s a good idea, but whatever). My thought is to use the variable from the while loop for each task in the javascript function. I’ve tried placing the ajax script into a javascript function and calling it on the onClick behavior for the link, but no luck. Thoughts?

Источник

Here is how it can be done (we are using a element so that the menu easily can be styled with CSS later): Example

Welcome to my home page!

Some text.

Some more text.

Run example » Example 3 Assume we have a file called «vars.php», with some variables defined: Then, if we include the «vars.php» file, the variables can be used in the calling file: Example

Welcome to my home page!

Run example » PHP include vs. require The statement is also used to include a file into the PHP code. However, there is one big difference between include and require; when a file is included with the statement and PHP cannot find it, the script will continue to execute: Example

Welcome to my home page!

Run example » If we do the same example using the statement, the echo statement will not be executed because the script execution dies after the statement returned a fatal error: Example

Welcome to my home page!

Run example » Use when the file is required by the application.

In JavaScript do while loop executes a statement block once and then repeats the execution until a specified condition evaluates to false.

In while loop, the given condition is tested at the beginning, i.e. before executing any of the statements within the while loop. In case of do while loop the condition is tested after execution of the statements within the while loop. This means that do-while would execute it’s statements at least once, even if the condition fails for the first time itself.

Pictorial Presentation:

The following web document calculates the sum of even numbers between 0 to 10. The do while loop starts with x = 0 and runs until it equals to 10. If the remainder of x/2 is equals to 0 we add x with y and after completion of the loop, y returns the sum of even numbers.

 
    
JavaScript : do while statement
 
The do while loop calculate the sum of even numbers between 0 to 10.
 
   

var x = 1; var y = 0; var z = 0; document.getElementById("result").innerHTML = "List of numbers : "; do < z = x % 2; if (z === 0) < var newParagraph1 = document.createElement("p"); var newText1 = document.createTextNode(x); newParagraph1.appendChild(newText1); document.body.appendChild(newParagraph1); y=y+x; >x++; > while (x  

while ($row = mysql_fetch_array($result))

while ($row = mysql_fetch_assoc($result)) < // print $row; >

while ($row = mysql_fetch_array($result))