Difference between #10 and #11 of
Background task with Ajax

Revision #11 has been created by Alexandre Rodichevski on Mar 19, 2016, 9:21:48 AM with the memo:

Minor corrections.
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Title unchanged

Background task with Ajax

Category unchanged

Tutorials

Yii version unchanged

Tags unchanged

background, asynchronous, AJAX

Content changed

[...]
// Returned from the form
if (isset($_POST['par'])) {
$par = $_POST['par']; // parameter specified
$fn = "rep_$par.txt"; // file name
$mime = 'text/plain'; // file type
$cont = $model->doTask($par); // generate reportlong report generation // Ajax button if (Yii::app()->request->isAjaxRequest) { $lt = new Longtask; $lt->cleanMy(); // deletes the previous task result
$lt->filename = $fn;
$lt->cont = $cont;
[...]
### runTask form

This form contains one text field, a submit button and an ajaxSubmitButton. The same form contains also thea link to download the result of the executed background task:
[...]
* The application administrator should have access to the `longtask` table in order to monitor all the background jobs.

* One can use also [`ajaxLink`](http://www.yiiframework.com/doc/api/1.1/CHtml#ajaxLink-detail) in case there are no input parameters requested from the user. * One can keep more records per task/user to preserve the history of tasks. In this case it is better for the user to have access to the `longtask` table via [`CGridView`](http://www.yiiframework.com/doc/api/1.1/CGridView).

* More information on the tasks can be specified in the `longtask` table. For example, it is possible to save the start time and the percentage of the execution. See for example the [BackJob extension](http://www.yiiframework.com/extension/backjob/).
[...]
* When the task's result is downloaded, it is reasonable to automatically delete the task's record from the `longtask` table. When the user has downloaded/deleted from the `runTask` form, a javascript should immediately hide the download link.

* When the task takes very long time to execute, it is a good idea to add in the beginning of the task code the `set_time_limit()` PHP instruction.
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Viewed: 25 553 times
Version: 1.1
Category: Tutorials
Tags: AJAX, asynchronous, background
Written by: Alexandre Rodichevski
Last updated by: Alexandre Rodichevski
Created on: Mar 17, 2016
Last updated: 8 years ago
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