I'm using Silex and Twig for an app and I'd like to use Twig to hide or display content based on a method call. I'd like a custom tag like:
{{ 'foo'|check }}
<p>This will only be displayed if check passes</p>
{{ endcheck }}
...then a method elsewhere such as:
check($key) {
if($key === 'foo') {
...
} else {
....
}
}
...which would decide if the HTML content is displayed.
As far as I know, you would have your method programmed as:
check($key) {
if($key === 'foo') {
return true;
} else {
return false;
}
}
And then your custom filter would be used like this:
{% if 'foo'|check %}
<p>This will only be displayed if check passes</p>
{% endif %}
You would only use {{ }} for straight output (similar to <?= ?> in PHP.)
You're missing the point of TWIG. One of the primary reasons TWIG exists is to keep PHP out of the templates. So if you have something very complicated then process the array before you pass it to TWIG otherwise if it's simple like you've described then just have the twig emulate that functionality.
{% if row.val == 'foo' %}
this will be displayed
{% else %}
maybe you do not want anything displayed?
{% endif %}
Related
does anyone know now to create a custom view type for ez platform? The default 3 have been exhausted and we need a new one for 'link'
Alternatively, does anyone know how to use the render( controller( with a custom template as this would also resolve out block right now.
Basically, we have a multi-relational field in a content object used and we need to print links to all the related contentIds, path works great but we cannot find a way to extract the name of the content object for the link without doing some fairly funky tpl logic of passing in params.
EG: As a hack for now we can pass in "embed_type" as a custom param with the render(controller("ez_content:viewAction" to pull in an alternate view for the content object for a specific content type and view type.
{% if embed_type is defined %}
{% include "embed/#{embed_type}.html.twig" %}
{% else %}
<h1>{{ ez_field_value( content, 'name') }}</h1>
{% endif %}
However, this is very ugly and all we really want to do is use 1 template for all content types, so all we need to do is loop through the relational field and print links (as the only thing available in the content field: "destination ids"). I am sure there used to be this option in the docs but i cannot find it anymore eg:
{% set links = ez_field_value( footer, "first_links_row" ).destinationContentIds%}
{% for id in links %}
{{ render(controller("ez_content:viewAction", {"contentId": id, "template": "link.html.twig"})) }}
{% endfor %}
Where the link.html.twig would simple print the link:
<a href="{{ path( "ez_urlalias", {"contentId": id} ) }}">
{{ ez_field_value( content, "name" ) }}
</a>
If using a custom tpl is not possible with the render (controller ( helper then a new custom view type would also fix this issue, but i cannot find documentation for either.
You can create a twig function that would do that. We have something like this:
Definition:
new Twig_SimpleFunction(
'content_name',
array($this, 'getContentName')
),
Implementation:
public function getContentName($content, $forcedLanguage = null)
{
if (!$content instanceof Content && !$content instanceof ContentInfo) {
$contentInfo = $this->repository->getContentService()->loadContentInfo($content);
} elseif ($content instanceof Content) {
$contentInfo = $content->contentInfo;
} else {
$contentInfo = $content;
}
return $this->translationHelper->getTranslatedContentNameByContentInfo($contentInfo, $forcedLanguage);
}
which enables you to provide either content id, content info or content itself, and it returns translated content name
im reading
Find substring in the string in TWIG
and on a single item it works fine for me.
<!-- language: lang-html -->
<li {% if 'page' in app.request.get('_route')|lower %}class="active"{% endif %}>
<a href="{{path('adminPage')}}">
<i class="fa fa-file-text"></i> <span>{% trans %}pages_text{% endtrans %}</span> <small class="label pull-right bg-{% if nav_options.count_pages > 0 %}primary{% else %}red{% endif %}">{{ nav_options.count_pages }}</small>
</a>
</li>
now I find myself needing it to happen differently.
how would I do to find if "items in this array" are contained in "this substring"
the example would be something like this
{% if ['str1','str2'] in/contained in app.request.get('_route')|lower %}class="active"{% endif %}
I tried this and does not work.
I also would rather avoid using the "or" operator, if its a requirement so be it, but if it can be avoided, the better.
I even went and attempted a split parameter.
{% if 'page,blog'|split(',') in app.request.get('_route')|lower %}active {% endif %}
no dice!
the code is meant to allow me to have "several possible routes" inside a collapsible menu item, and if any of the possible route names (i have several route names, blog, blogAdd, blogEdit, blogPost etc) contains "blog" (same with page, and many others) the "active" class should be printed.
Creating a custom twig function would be an easier solution to use
$function = new Twig_SimpleFunction('array_in_string', function ($haystacks, $needle) {
foreach($haystacks as $haystack) if (stripos($haystack, $needle) !== false) return true;
return false;
});
$twig = new Twig_Environment($loader);
$twig->addFunction($function);
Then you call this function in Twig with :
{% if array_in_string(['page','blog',], app.request.get('_route')) %}
{# do sthing #}
{% endif %}
I don't think you ought to be accessing HTTP stuff - eg get variables - in your view. That's kinda muddying yer MVC a bit.
I'd resolve all that in your controller, and just pass the result to the view (untested, obviously, so treat it as pseudocode):
// controller
$thingIsActive = in_array(strtolower($request->get('_route')), ['str1','str2']);
return $app['twig']->render('whatever.twig', ['thingIsActive' => $thingIsActive]);
{# whatever.twig #}
<li{% if thingIsActive %} class="active"{% endif %}>
Are there any nice ways to use while and repeat loops in Twig? It is such a simple task, but without macros I can't find anything nice and simple.
At least do an infinite cycle and then break it in a condition?
EDIT:
I mean something like
do {
// loop code
} while (condition)
or
while (condition) {
// loop code
}
Edit 2:
Looks like it is not supported natively by twig same reason as it is not supported neither continue; or break; statements.
https://github.com/twigphp/Twig/issues/654
You can emulate it with for ... in ... if by using a sufficiently-high loop limit (10000?)
while
PHP:
$precondition = true;
while ($precondition) {
$precondition = false;
}
Twig:
{% set precondition = true %}
{% for i in 0..10000 if precondition %}
{% set precondition = false %}
{% endfor %}
do while
PHP:
do {
$condition = false;
} while ($condition)
Twig:
{% set condition = true %} {# you still need this to enter the loop#}
{% for i in 0..10000 if condition %}
{% set condition = false %}
{% endfor %}
I was able to implement a simple for loop in twig. So the following php statement:
for ($x = 0; $x <= 10; $x++) {
echo "The number is: $x <br>";
}
when translated to twig is:
{% for i in 0..10 %}
* {{ i }}
{% endfor %}
It's not a while loop but a potential workaround. The best suggestion is to leave business logic like this out of the template layer.
In a nutshell: no. This functionality implies advanced logic, which should be in your business logic, not in the template layer. It's a prime example of the separation of concerns in MVC.
Twig supports for-loops completely, which should suffice if you code correctly - being that complex conditional decisions on which data to display are taken in the business logic where they belong, which then pass a resulting array 'ready to render' to the templates. Twig then supports all nice features only needed for rendering.
This is possible, but a little bit complicated.
You can use {% include ... %} to process nested arrays, which from the comments I read is what you need to do.
Consider the following code:
nested_array_display.html
<ul>
{% for key, val in arr %}
<li>
{{ key }}:
{% if val is iterable %}
{% include 'nested_array_display.html' %}
{% else %}
{{ val }}
{% endif %}
</li>
{% endfor %}
</ul>
Warning with the top solution with "high loop limit" : the loop doesn't break when the condition returns false, it just doesn't enter the loop. So the loop runs up to the high indice
First of all, I know that the logic should be in the controller and not in the view and I keep it that way.
But in this particular situation I need to use preg_match within a ternary operation to set the css class of a div.
Example:
{% for list in lists %}
<div class="{{ (preg_match(list.a, b))>0 ? something : else }}"...>...</div>
{% endfor %}
How can I achieve the (preg_match(list.a,b))>0 condition in twig?
Thanks in advance
For those who came here from Google search results (like me).
There's containment operator that allows you to do something like this:
{{ 'cd' in 'abcde' }} {# returns true #}
You can't use preg_match() directly but there are ways to accomplish it:
if your list is an entity, add a method matches(): {{ (list.matches(b)) ? something : else }}
you could create a custom Twig extension function that uses preg_match() internally http://symfony.com/doc/master/cookbook/templating/twig_extension.html
Expanding from Serge's comment and is the correct answer.
In my example my string is "Message Taken - 12456756". I can then use |split to convert it into an array and use |replace to get ride of white space.
{% set mt = 'Message Taken' in d.note %}
{% if mt == true %}
{#.. you can then do something that is true#}
{% set mt_array = d.note|split('-') %}
{{ mt_array[0] }} | {{ mt_array[1]|replace({' ' : ''}) }}
{% endif %}
This would output my string but I now control two parts instead of 1.
What's the best way to create breadcrumbs using knpmenu bundle in symfony 2.1.x ? Aside from using 3-rd party bundles.
UPDATE:
Hi, theunraveler, sorry for late answer. Now I've been following your example and I'm stuck at one moment. Here, code below throws an exception, that
Missing argument 2 for Acme\DemoBundle\Menu\MenuBuilder::getBreadCrumbs()
{% set item = knp_menu_get('main') %}
{{ knp_menu_render(item) }}
{% block breadcrumbs %}
{% set breadcrumbs = knp_menu_get('breadcrumbs', [], {'request': app.request, 'menu': item }) %}
{{ dump(breadcrumbs) }}
{% endblock %}
Why it doesn't accepts "item" variable?
Since version 2.0, getBreadcrumbsArray has been moved to Knp\Menu\Util\MenuManipulator.
Possible workout to this solution is to create a twig extension:
<?php
namespace Kimwild\CommonBundle\Twig;
use Knp\Menu\Util\MenuManipulator;
use Knp\Menu\ItemInterface;
class MenuManipulatorExtension extends \Twig_Extension
{
public function getFunctions()
{
return array(
new \Twig_SimpleFunction('menu_manipulator', array($this, 'menuManipulator')),
);
}
public function menuManipulator(ItemInterface $item)
{
$manipulator = new MenuManipulator();
return $manipulator->getBreadcrumbsArray($item);
}
public function getName()
{
return 'menu_manipulator';
}
}
Register twig extension:
kimwild_common.menu_manipulator_extension:
class: Kimwild\CommonBundle\Twig\MenuManipulatorExtension
public: false
tags:
- { name: twig.extension }
In breadcrumb.html.twig:
{% block root %}
{%- for link in menu_manipulator(item) %}
/* whatever you want to do ... */
{%- endfor %}
{% endblock %}
The Knp\Menu\MenuItem class has a getBreadcrumbsArray() method. It should return an array of items in the current active menu trail. If you are on an earlier version of KnpMenu (<= 1.1.2, I think), the returned array will be in the form of label => uri. Otherwise, it will be an array with each item having keys label, uri, and item.
To find the current menu item, you'll probably want to create a method in your controller (or somewhere else, if it makes more sense for your project) that looks something like this:
public function getCurrentMenuItem($menu)
{
foreach ($menu as $item) {
if ($item->isCurrent()) {
return $item;
}
if ($item->getChildren() && $current_child = $this->getCurrentMenuItem($item)) {
return $current_child;
}
}
return null;
}
From there, you can call getBreadcrumbsArray() on the returned value:
$this->getCurrentMenuItem($your_menu)->getBreadcrumbsArray();
I guess what I would do ultimately is create a Twig extension that registers a breadcrumbs global, and put the getCurrentMenuItem() method in there. That way, you can have the breadcrumb variable in all of your templates without having to manually render it in each controller.
Source: https://github.com/KnpLabs/KnpMenu/blob/master/src/Knp/Menu/MenuItem.php#L544.
Since KnpMenu 2.1, there is a new twig function: knp_menu_get_breadcrumbs_array
You can take a look at my gist: https://gist.github.com/fsevestre/b378606c4fd23814278a
I added a new twig function knp_menu_get_current_item, which retrieve the current menu item and work fine with the knp_menu_get_breadcrumbs_array function.
--
Edit:
With KnpMenu 2.2, you can now do:
<ol class="breadcrumb">
{% for breadcrumb_item in knp_menu_get_breadcrumbs_array(knp_menu_get_current_item('main')) %}
{% if not loop.last %}
<li>{{ breadcrumb_item.label }}</li>
{% else %}
<li class="active">{{ breadcrumb_item.label }}</li>
{% endif %}
{% endfor %}
</ol>
https://github.com/KnpLabs/KnpMenu/blob/master/doc/02-Twig-Integration.markdown#functions
The knp_menu_get_current_item('main') Twig function will retrieve the current menu item, for the main menu.