$page->render() for list of child pages in delegate template approach

gebeer · August 9, 2014

Hello,

I'm using PW 2.4.11 with its delegate template approach.

I have a page "places" with template places.php to list all its sub pages

<?php
//template places 
foreach ($page->children as $child) {
	$content .= $child->render();
};
?>

All sub-pages of "places" have the place.php template

<?php
//template place 

$tags = '';
foreach ($page->tags as $tag) {
	$tags .= "<li><a href='#'>{$tag->title}</a></li>\n";
}

$content = "<article class='article'>\n";
$content .= "<ul class='nav nav-pills'>\n$tags</ul>\n";
$content .= "<h2>{$page->title}</h2>\n";
$content .= "{$page->body}";
$content .= "</article>";
?>

Problem is that for every sub page the whole _main.php gets rendered.

I guess this happens because of

$useMain = true;

in _init.php.

How can I tell the place.php template to only include _main.php when it is not called through the render() method?

If I add

$useMain = false;

to place.php, I get a blank page.

I'm sure the solution must be really simple. But for me not being a coder, I just can't seem to get my head around it.

Martijn Geerts · August 9, 2014

<?php
//template places 
foreach ($page->children as $child) {
    $child->rendered = true;
    $content .= $child->render();
};
?>


<?php
// on the child template

if ($this->rendered) { // not sure, could work or else take it from $page->rendered
    echo "<div>markup you need</div>"
    return; // return, end rendering & give control back to processwire
}

?>
<!doctype html> 
<html>
<head>
... etc

Can't test this right now... sorry

gebeer · August 9, 2014

Thanks for the quick reply. I adapted my code following your suggestions.

My places.php

<?php
//template places 

foreach ($page->children as $child) {
	$child->rendered = true;
	$content .= $child->render();
};
?>

and place.php

<?php
//template place
$tags = '';
foreach ($page->tags as $tag) {
    $tags .= "<li><a href='#'>{$tag->title}</a></li>\n";
}
if ($page->rendered) {
    echo "<article class='article'>\n";
    echo "<ul class='nav nav-pills'>\n$tags</ul>\n";
    echo "<h2>{$page->title}</h2>\n";
    echo "{$page->body}";
    echo "</article>";
    return;
} else {
    $content = "<article class='article'>\n";
    $content .= "<ul class='nav nav-pills'>\n$tags</ul>\n";
    $content .= "<h2>{$page->title}</h2>\n";
    $content .= "{$page->body}";
    $content .= "</article>";
}

?>

But still the same result. For each child page the whole _main.php gets rendered.

I also tried in places.php

foreach ($page->children as $child) {
	$content .= $child->render($useMain = false);
};

with my original code in places.php

But this gives a blank page again.

adrian · August 9, 2014

Sorry, haven't read this thoroughly, but quick comment. To pass $useMain via render, you need to use the $options array:

https://processwire.com/talk/topic/3145-multiple-views-for-templates/?p=32876

gebeer · August 10, 2014

@adrian

Thanks for pointing that out.

When I pass it like

$child->render(array("useMain" => false))

and then check in the child template

$useMain = ($options['useMain'] === false) ? false : true;

I get the same results as passing it like

$child->render($useMain = false)

Which renders a blank page.

So the problem is not passing the value for $useMain in the right manner.

Rather it is the delegate approach that I'm struggling with.

My places.php is calling the child template (place.php) multiple times for rendering each child page. Everytime the child page template is being called for rendering, _main.php gets included. Result is multiple rendering of the complete html from _main.php.

Now when I set $useMain to false for the child page template I'd expect to just get the markup from that template. But instead I get an empty string. That's what is confusing me.

gebeer · October 15, 2015

I need to revisit this thread because the problem has given me a headache agein today.

It seemed like $page->render($options) cannot be used with the delegate approach where you assign your content to a variable in your template file and _main.php gets included and renders that variable.

Here my setup to test this behaviour:

basic_page.php

<?php

$gallery = $page->children()->first();

content = $gallery->render(array("useMain" => false));

$gallery has template gallery.php

<?php

if (isset($options['useMain'])) $useMain = $options['useMain'];

$content = "<h2 class='page-header'>{$page->title}</h2>
{$page->bodycopy}";

With this setup "$gallery->render(array("useMain" => false));" returns an empty string.

if I change gallery.php to

<?php

if (isset($options['useMain'])) $useMain = $options['useMain'];

// NOTE THE echo instead of $content =
echo "<h2 class='page-header'>gbr{$page->title}</h2>
{$page->bodycopy}";

Then I get the string that I would expect from "$gallery->render(array("useMain" => false));"

So the culprit seems to be the $page->render($options) method not returning my $content variable from the gallery.php template.

The solution is dead simple, though. gallery.php:

<?php

if (isset($options['useMain'])) $useMain = $options['useMain'];

$content = "<h2 class='page-header'>{$page->title}</h2>
{$page->bodycopy}";

if (!$useMain) echo $content;

webhoes · January 5, 2017

How about disabeling _main.php and make a footer.inc with the stuff needed?

That won't get parsed in your places.php I think.

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$page->render() for list of child pages in delegate template approach

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