Javascript – Why can not the content of a page displayed on a client be updated when the application data changes on the server?

Distributed Systems of Coulouris says

AJAX (Asynchronous Javascript and
XML)
is an extension of the world-wide client-server interaction style
Wide Web. AJAX meets the need for fine-grained communication between a Javascript
Front-end program running in a web browser and a server-based back-end program
Data describing the status of the application.

To summarize it, in the standard web
Type of interaction
A browser sends an HTTP request to a server for a page, picture or
another resource with a specific URL. The server responds by sending a full page
Depending on the type, it is either read from a file on the server or generated by a program
the resource is specified in the URL. When the resulting content is received on the client,
The browser displays it according to the display method relevant to its MIME type
(Text / HTML, image / JPG etc.). A website can consist of several elements
Contents of different kind is compiled and presented the whole side by the browser
the manner specified in the HTML page definition.
This default interaction style limits the development of web applications
in several ways:

  • Once the browser has issued an HTTP request for a new web page, the user can first interact with the page with the new HTML code
    Content is received and presented by the browser. This time
    Interval is indefinite because it is the network and subject
    Server delays.

  • To update even a small part of the current page with additional data from the server, a new page must be requested
    and displayed. This leads to a delayed response to the user.
    additional processing both on the client and on the server and redundant
    Network traffic.

  • The content of a page displayed on a client can not be updated if the application data stored on the server has changed.

The introduction of Javascript, a cross-platform and cross-browser programming language that is downloaded and executed
in the browser, a first step towards removing them
Limitations. Javascript is a general purpose language that enables both
User interface and application logic in which to program and execute
the context of a browser window.

ajax This is the second innovative step required to enable the development and delivery of key interactive web applications. It
allows Javascript front-end programs to request new data directly
of server programs. Any data can be queried and the current
Page refreshed selectively to display the new values. In fact the front
end can react to the new data in a way that makes sense for the Internet
Application.

Why can not the content of a page displayed on a client be updated in the default Web interaction style if the application data stored on the server changes? Can not the client update the content of a page by making another explicit request to retrieve all the data that is obviously up to date?

What does it mean to "update the contents of a page displayed on a client", "if the application data stored on the server changes"? If the update is automatic, d. H. Implicitly, or does the client need to explicitly make another request to find out if there are any "changes to the application data stored on the server"?

How does Javascript or AJAX solve the problem?

Migration – problem importing source CSV content with HTML

I use migrate_source_csv to import node body fields. The header for my CSV file is "nid, title, body". The body fields contain HTML. My problem is that when importing the HTML code is coded in entity references. See the screenshot below. Here is my migration YML file:

id: news_article_nodes
label: News article data we want.
migration_group: gdg_group
source: 
  plugin: csv
  path: 'modules/custom/gdg_migration/import/news_article/news_articles.csv' 
  ids: [nid]
  header_row_count: 1
process:
  nid: nid
  title: title
  'body/0/value': body
  'body/0/format':
    plugin: default_value
    default_value: full_html
destination: 
   plugin: entity:node
   overwrite_properties:
     - body
   default_bundle: news_article

I have to miss something. Is there a plugin that imports the data as plain text?

Screenshot of the node body with coded HTML

Other sell – SEO Content Machine + forever updated

Embed

HTML:

BBCode:

Link image:

views – Fatal error when using some filters or sort options in admin / content

Using Drupal 8.8.0, multilingual, on localhost (Windows 10, PHP 7.3.12).

I have a serious mistake in the admin/content Page, but only if I use certain options to sort or filter the results.

Available filters:

  • Title: works fine
  • Content Type: fatal error
  • Release Status: works fine
  • Language: works fine

Available sort options:

  • Title: fatal error
  • Content Type: fatal error
  • Author: fatal error
  • Status (published / not): works fine
  • updated: works fine
  • created: works fine

However, if a filter is used (and did not cause a crash), all sort options work as far as I can tell.

When checking the server log, I notice the following error:

Error: Call to a member function getId() on null in C:\htdocs\myproject\www\core\lib\Drupal\Core\Entity\Entity\EntityViewDisplay.php on line 258 #0 C:\htdocs\myproject\www\core\modules\views\src\Entity\Render\EntityFieldRenderer.php(276): Drupal\Core\Entity\Entity\EntityViewDisplay->buildMultiple(Array), referer: http://localhost/myproject/www/fr/admin/content
#1 C:\htdocs\myproject\www\core\modules\views\src\Entity\Render\EntityFieldRenderer.php(163): Drupal\views\Entity\Render\EntityFieldRenderer->buildFields(Array), referer: http://localhost/myproject/www/fr/admin/content
#2 C:\htdocs\myproject\www\core\modules\views\src\Plugin\views\field\EntityField.php(846): Drupal\views\Entity\Render\EntityFieldRenderer->render(Object(Drupal\views\ResultRow), Object(Drupal\views\Plugin\views\field\EntityField)), referer: http://localhost/myproject/www/fr/admin/content
#3 C:\htdocs\myproject\www\core\modules\views\src\Plugin\views\field\FieldPluginBase.php(1148): Drupal\views\Plugin\views\field\EntityField->getItems(Object(Drupal\views\ResultRow)), referer: http://localhost/myproject/www/fr/admin/content
#4 C:\htdocs\myproject\www\core\modules\views\views.theme.inc(236): Drupal\views\Plugin\views\field\FieldPluginBase->advancedRender(Object(Drupal\views\ResultRow)), referer: http://localhost/myproject/www/fr/admin/content
#5 C:\htdocs\myproject\www\core\lib\Drupal\Core\Theme\ThemeManager.php(287): template_preprocess_views_view_field(Array, 'views_view_fiel...', Array), referer: http://localhost/myproject/www/fr/admin/content
#6 C:\htdocs\myproject\www\core\lib\Drupal\Core\Render\Renderer.php(431): Drupal\Core\Theme\ThemeManager->render('views_view_fiel...', Array), referer: http://localhost/myproject/www/fr/admin/content
#7 C:\htdocs\myproject\www\core\lib\Drupal\Core\Render\Renderer.php(200): Drupal\Core\Render\Renderer->doRender(Array, false), referer: http://localhost/myproject/www/fr/admin/content
#8 C:\htdocs\myproject\www\core\modules\views\src\Plugin\views\field\FieldPluginBase.php(1747): Drupal\Core\Render\Renderer->render(Array), referer: http://localhost/myproject/www/fr/admin/content
#9 C:\htdocs\myproject\www\core\modules\views\src\Plugin\views\style\StylePluginBase.php(770): Drupal\views\Plugin\views\field\FieldPluginBase->theme(Object(Drupal\views\ResultRow)), referer: http://localhost/myproject/www/fr/admin/content
#10 (internal function): Drupal\views\Plugin\views\style\StylePluginBase->elementPreRenderRow(Array), referer: http://localhost/myproject/www/fr/admin/content
#11 C:\htdocs\myproject\www\core\lib\Drupal\Core\Security\DoTrustedCallbackTrait.php(100): call_user_func_array(Array, Array), referer: http://localhost/myproject/www/fr/admin/content
#12 C:\htdocs\myproject\www\core\lib\Drupal\Core\Render\Renderer.php(781): Drupal\Core\Render\Renderer->doTrustedCallback(Array, Array, 'Render #pre_ren...', 'silenced_deprec...', 'Drupal\\Core\\Ren...'), referer: http://localhost/myproject/www/fr/admin/content
#13 C:\htdocs\myproject\www\core\lib\Drupal\Core\Render\Renderer.php(372): Drupal\Core\Render\Renderer->doCallback('#pre_render', Array, Array), referer: http://localhost/myproject/www/fr/admin/content
#14 C:\htdocs\myproject\www\core\lib\Drupal\Core\Render\Renderer.php(200): Drupal\Core\Render\Renderer->doRender(Array, false), referer: http://localhost/myproject/www/fr/admin/content
#15 C:\htdocs\myproject\www\core\modules\views\src\Plugin\views\style\StylePluginBase.php(709): Drupal\Core\Render\Renderer->render(Array), referer: http://localhost/myproject/www/fr/admin/content
#16 C:\htdocs\myproject\www\core\modules\views\src\Plugin\views\style\StylePluginBase.php(576): Drupal\views\Plugin\views\style\StylePluginBase->renderFields(Array), referer: http://localhost/myproject/www/fr/admin/content
#17 C:\htdocs\myproject\www\core\modules\views\src\Plugin\views\style\StylePluginBase.php(468): Drupal\views\Plugin\views\style\StylePluginBase->renderGrouping(Array, Array, true), referer: http://localhost/myproject/www/fr/admin/content
#18 C:\htdocs\myproject\www\core\modules\views\src\Plugin\views\display\DisplayPluginBase.php(2140): Drupal\views\Plugin\views\style\StylePluginBase->render(Array), referer: http://localhost/myproject/www/fr/admin/content
#19 C:\htdocs\myproject\www\core\modules\views\src\ViewExecutable.php(1533): Drupal\views\Plugin\views\display\DisplayPluginBase->render(), referer: http://localhost/myproject/www/fr/admin/content
#20 C:\htdocs\myproject\www\core\modules\views\src\Plugin\views\display\Page.php(183): Drupal\views\ViewExecutable->render(), referer: http://localhost/myproject/www/fr/admin/content
#21 C:\htdocs\myproject\www\core\modules\views\src\ViewExecutable.php(1630): Drupal\views\Plugin\views\display\Page->execute(), referer: http://localhost/myproject/www/fr/admin/content
#22 C:\htdocs\myproject\www\core\modules\views\src\Element\View.php(77): Drupal\views\ViewExecutable->executeDisplay('page_1', Array), referer: http://localhost/myproject/www/fr/admin/content
#23 (internal function): Drupal\views\Element\View::preRenderViewElement(Array), referer: http://localhost/myproject/www/fr/admin/content
#24 C:\htdocs\myproject\www\core\lib\Drupal\Core\Security\DoTrustedCallbackTrait.php(100): call_user_func_array(Array, Array), referer: http://localhost/myproject/www/fr/admin/content
#25 C:\htdocs\myproject\www\core\lib\Drupal\Core\Render\Renderer.php(781): Drupal\Core\Render\Renderer->doTrustedCallback(Array, Array, 'Render #pre_ren...', 'silenced_deprec...', 'Drupal\\Core\\Ren...'), referer: http://localhost/myproject/www/fr/admin/content
#26 C:\htdocs\myproject\www\core\lib\Drupal\Core\Render\Renderer.php(372): Drupal\Core\Render\Renderer->doCallback('#pre_render', Array, Array), referer: http://localhost/myproject/www/fr/admin/content
#27 C:\htdocs\myproject\www\core\lib\Drupal\Core\Render\Renderer.php(200): Drupal\Core\Render\Renderer->doRender(Array, false), referer: http://localhost/myproject/www/fr/admin/content
#28 C:\htdocs\myproject\www\core\lib\Drupal\Core\Render\MainContent\HtmlRenderer.php(226): Drupal\Core\Render\Renderer->render(Array, false), referer: http://localhost/myproject/www/fr/admin/content
#29 C:\htdocs\myproject\www\core\lib\Drupal\Core\Render\Renderer.php(573): Drupal\Core\Render\MainContent\HtmlRenderer->Drupal\Core\Render\MainContent\{closure}(), referer: http://localhost/myproject/www/fr/admin/content
#30 C:\htdocs\myproject\www\core\lib\Drupal\Core\Render\MainContent\HtmlRenderer.php(227): Drupal\Core\Render\Renderer->executeInRenderContext(Object(Drupal\Core\Render\RenderContext), Object(Closure)), referer: http://localhost/myproject/www/fr/admin/content
#31 C:\htdocs\myproject\www\core\lib\Drupal\Core\Render\MainContent\HtmlRenderer.php(117): Drupal\Core\Render\MainContent\HtmlRenderer->prepare(Array, Object(Symfony\Component\HttpFoundation\Request), Object(Drupal\Core\Routing\CurrentRouteMatch)), referer: http://localhost/myproject/www/fr/admin/content
#32 C:\htdocs\myproject\www\core\lib\Drupal\Core\EventSubscriber\MainContentViewSubscriber.php(90): Drupal\Core\Render\MainContent\HtmlRenderer->renderResponse(Array, Object(Symfony\Component\HttpFoundation\Request), Object(Drupal\Core\Routing\CurrentRouteMatch)), referer: http://localhost/myproject/www/fr/admin/content
#33 (internal function): Drupal\Core\EventSubscriber\MainContentViewSubscriber->onViewRenderArray(Object(Symfony\Component\HttpKernel\Event\GetResponseForControllerResultEvent), 'kernel.view', Object(Drupal\Component\EventDispatcher\ContainerAwareEventDispatcher)), referer: http://localhost/myproject/www/fr/admin/content
#34 C:\htdocs\myproject\www\core\lib\Drupal\Component\EventDispatcher\ContainerAwareEventDispatcher.php(111): call_user_func(Array, Object(Symfony\Component\HttpKernel\Event\GetResponseForControllerResultEvent), 'kernel.view', Object(Drupal\Component\EventDispatcher\ContainerAwareEventDispatcher)), referer: http://localhost/myproject/www/fr/admin/content
#35 C:\htdocs\myproject\www\vendor\symfony\http-kernel\HttpKernel.php(156): Drupal\Component\EventDispatcher\ContainerAwareEventDispatcher->dispatch('kernel.view', Object(Symfony\Component\HttpKernel\Event\GetResponseForControllerResultEvent)), referer: http://localhost/myproject/www/fr/admin/content
#36 C:\htdocs\myproject\www\vendor\symfony\http-kernel\HttpKernel.php(68): Symfony\Component\HttpKernel\HttpKernel->handleRaw(Object(Symfony\Component\HttpFoundation\Request), 1), referer: http://localhost/myproject/www/fr/admin/content
#37 C:\htdocs\myproject\www\core\lib\Drupal\Core\StackMiddleware\Session.php(57): Symfony\Component\HttpKernel\HttpKernel->handle(Object(Symfony\Component\HttpFoundation\Request), 1, true), referer: http://localhost/myproject/www/fr/admin/content
#38 C:\htdocs\myproject\www\core\lib\Drupal\Core\StackMiddleware\KernelPreHandle.php(47): Drupal\Core\StackMiddleware\Session->handle(Object(Symfony\Component\HttpFoundation\Request), 1, true), referer: http://localhost/myproject/www/fr/admin/content
#39 C:\htdocs\myproject\www\core\modules\page_cache\src\StackMiddleware\PageCache.php(106): Drupal\Core\StackMiddleware\KernelPreHandle->handle(Object(Symfony\Component\HttpFoundation\Request), 1, true), referer: http://localhost/myproject/www/fr/admin/content
#40 C:\htdocs\myproject\www\core\modules\page_cache\src\StackMiddleware\PageCache.php(85): Drupal\page_cache\StackMiddleware\PageCache->pass(Object(Symfony\Component\HttpFoundation\Request), 1, true), referer: http://localhost/myproject/www/fr/admin/content
#41 C:\htdocs\myproject\www\core\lib\Drupal\Core\StackMiddleware\ReverseProxyMiddleware.php(47): Drupal\page_cache\StackMiddleware\PageCache->handle(Object(Symfony\Component\HttpFoundation\Request), 1, true), referer: http://localhost/myproject/www/fr/admin/content
#42 C:\htdocs\myproject\www\core\lib\Drupal\Core\StackMiddleware\NegotiationMiddleware.php(52): Drupal\Core\StackMiddleware\ReverseProxyMiddleware->handle(Object(Symfony\Component\HttpFoundation\Request), 1, true), referer: http://localhost/myproject/www/fr/admin/content
#43 C:\htdocs\myproject\www\vendor\stack\builder\src\Stack\StackedHttpKernel.php(23): Drupal\Core\StackMiddleware\NegotiationMiddleware->handle(Object(Symfony\Component\HttpFoundation\Request), 1, true), referer: http://localhost/myproject/www/fr/admin/content
#44 C:\htdocs\myproject\www\core\lib\Drupal\Core\DrupalKernel.php(694): Stack\StackedHttpKernel->handle(Object(Symfony\Component\HttpFoundation\Request), 1, tru, referer: http://localhost/myproject/www/fr/admin/content

(Every line starting with (Fri Dec 06 19:26:08.993106 2019) (fcgid:warn) (pid 16812:tid 1200) (client ::1:64229) mod_fcgid: stderr:)

Can anyone help figure out what causes this error? Thank you in advance.

Sales – Content | Review | comparison

Why are you selling this page?
I have lost my regular job and have to raise money. The site has huge potential with someone who can work on it. An average of 1000 visitors per day are counted. Adsense ranges from £ 1 to £ 2 a day, about $ 2 to $ 3. In recent years, the site did not do enough work and unique content because I had a job.
SEMrush

How is it monetized?
content

Is this page coming with any social media accounts?
No

How long does it take to run this website?
N / A

What are the challenges in running this website?
N / A

Views – Displays the URL where the content is in my search results

I am using the SOLR search / search API on my Drupal 8 site and have set the view to display the following two fields:

  • Content Data Source: Title (The title & link to the page)
  • Search: Excerpt (Highlighted text of search terms found on the page)

I also want to display the URL of the page where the content is located under these two fields. However, there is no URL field to add. I also tried to retrieve only the URL from the "Title" field, but I can not get it from there.

Below is an example of what I want to achieve.

Example of how search results should look like

Would anyone have any ideas how to even add that?

Duplication of content

OK, so I'm producing a magazine that's an app in the App Store. And for those who prefer to read the magazine on a desk / laptop. I publish a copy as a flipbook in PDF format on a free Issuu account.

Every month I want to copy the mag articles of the previous month into my WordPress blog as they are a good cornerstone. But if Google already indexed the PDF flipbook on Issuu, they'll think I'm just copying another person. satisfied and punish me?

cheers

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