I have a twig template where I would like to test if an item begins with a certain value
{% if item.ContentTypeId == '0x0120' %}
<td><a href='?parentId={{ item.Id }}'>{{ item.BaseName }}</a><br /></td>
{% else %}
<td><a href='?{{ item.UrlPrefix }}'>{{ item.LinkFilename }}</a></td>
{% endif %}
The 0x0120 can look like that or be more complex like this 0x0120D52000D430D2B0D8DD6F4BBB16123680E4F78700654036413B65C740B168E780DA0FB4BX. The only thing I want to do is to ensure that it starts with the 0x0120.
The ideal solution would be to solve this by using regex but I'm not aware if Twig supports this?
Thanks
You can do that directly in Twig now:
{% if 'World' starts with 'F' %}
{% endif %}
"Ends with" is also supported:
{% if 'Hello' ends with 'n' %}
{% endif %}
Other handy keywords also exist:
Complex string comparisons:
{% if phone matches '{^[\\d\\.]+$}' %} {% endif %}
(Note: double backslashes are converted to one backslash by twig)
String contains:
{{ 'cd' in 'abcde' }}
{{ 1 in [1, 2, 3] }}
See more information here: http://twig.sensiolabs.org/doc/templates.html#comparisons
Yes, Twig supports regular expressions in comparisons: http://twig.sensiolabs.org/doc/templates.html#comparisons
In your case it would be:
{% if item.ContentTypeId matches '/^0x0120.*/' %}
...
{% else %}
...
{% endif %}
You can just use the slice filter. Simply do:
{% if item.ContentTypeId[:6] == '0x0120' %}
{% endif %}
You can always make your own filter that performs the necessary comparison.
As per the docs:
When called by Twig, the PHP callable receives the left side of the filter (before the pipe |) as the first argument and the extra arguments passed to the filter (within parentheses ()) as extra arguments.
So here is a modified example.
Creating a filter is as simple as associating a name with a PHP
callable:
// an anonymous function
$filter = new Twig_SimpleFilter('compareBeginning', function ($longString, $startsWith) {
/* do your work here */
});
Then, add the filter to your Twig environment:
$twig = new Twig_Environment($loader);
$twig->addFilter($filter);
And here is how to use it in a template:
{% if item.ContentTypeId | compareBeginning('0x0120') == true %}
{# not sure of the precedence of | and == above, may need parentheses #}
I'm not a PHP guy, so I don't know how PHP does regexes, but the anonymous function above is designed to return true if $longString begins with $startsWith. I'm sure you'll find that trivial to implement.
Related
I'm working on a template and I need to check if something is an array. How do I do that in Twig?
I've tried
{% if my_var is iterable %}
{% for v in my_var %}
...
{% endfor %}
{% else %}
{{ my_var }}
{% endif %}
but it always prints my_var, even when my_var is really an array, as evidenced when it prints out
Array
Array
myusername
../data/table.sqlite3
Another way :
{% if my_var.count()>1 %}
If you don't want to create a custom filter use iterable, as per the docs :
iterable checks if a variable is an array or a traversable object
{% if myVar is iterable %} ... {% endif %}
Just add a custom filter:
$twig->addFilter('is_array', new \Twig_Filter_Function('is_array'));
Then use it like this:
{% if my_var|is_array %}
I have a situation where I need to identify if there is a blank space in a variable in a twig template, and to treat it slightly differently.
Given names in this application are stored with middle initials in the given name field; they are not stored separately.
What I'm trying to achieve is this: Typically most given names are one word, e.g. "John" or "Susan" or something similar. In some of these cases we have cases where the middle initial is stored within this variable (e.g. John J)
Following standard citation standards, we need to be able to list items like this:
{{ surname }}, {{ given_name }}, ed.
This way it would appear like "Smith, John, ed." This is normally fine, however in some situations, where there is a middle initial, it appears as "Smith, John J, ed." - this is incorrect. I can't add a period after the given name, as "Smith, John., ed" would be an incorrect citation standard.
What I'm trying to do is to identify if a given_name contains a space, followed by a single letter, and then format it differently.
Something like this:
{% if given_name [has a blank space preceding a single letter] %}
{{ given_name }}., ed.
{% else %}
{{ given_name }}, ed.
{% endif %}
Is there a way to do this with regex within twig, or is there another method?
Thanks in advance
We can translate your requirement:
has a blank space preceding a single letter
In this little algorithm:
{% set given_name = 'John J' %}
{% set given_name_elems = given_name|split(' ') %}
{% set size = given_name_elems|length %}
{% if size >0 and given_name_elems[size-1]|length == 1%}
{ given_name }}., ed.
{%else%}
{{ given_name }}, ed.
{%endif%}
I suggest you to incapsulate this logic in a function or in a macro.
You could made some try in this working example
This is possible, but is not necessarily going to handle edge cases well. Assuming that you need to do the whole thing in twig, you could do something like this:
{% set nameArray = given_name | split(' ') %}
{% set first_name = nameArray[0] %}
{% set middle_initial = nameArray[1] is defined ? " "~nameArray[1]~"." : ""%}
At this point `middle_initial is now set to either an empty string or the middle initial with the period so you can output the full name like:
{{ surname }}, {{first_name ~ middle_initial}}, ed
You could use a regex with the matches comparison operator and add the dot if given_name matches the pattern.
{{ given_name }}{% if given_name matches '/^.+ .$/' %}.{% endif %}
Sorry, I didn't give you a good answer initially. I've updated my code and my twigfiddle. It's a bit simpler than #Matteo 's:
{% set given_name = 'John J' %}
{% set nameArray = given_name|split(' ') %}
{% if nameArray[1] is defined %}
{{ nameArray[0] }} {{ nameArray[1] }}., ed.
{% else %}
{{ nameArray[0] }}, ed.
{% endif %}
Where {{ nameArray[0] }} specifies the first element of the array. If nameArray1 contains anything, then it is defined.
Here is a working twigfiddle to show you it works.
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.