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Informations about the package yii2-loadmore
yii2-loadmore
Load More button for Yii2
LoadMorePager, the main part of the yii2-loadmore package, is a widget that can be used as a pager for a GridView or a ListView of the Yii 2.0 PHP Framework. In stead of the usual LinkPager, a 'Load More' button is rendered. Clicking it, adds a bunch of new items to the list. With every click, the list grows until there are no more items to show.
A demonstration of LoadMorePager is here.
Installation
Install yii2-loadmore in the usual way with Composer.
Add the following to the require
section of your composer.json
file:
"sjaakp/yii2-loadmore": "*"
or run:
composer require sjaakp/yii2-loadmore
You can manually install yii2-loadmore by downloading the source in ZIP-format.
Using LoadMorePager
Use LoadMorePager in a GridView just by setting the latter's
pager
property
to a configuration array with the former's class, like:
...
<?= GridView::widget([
'dataProvider' => ...
'pager' => [
'class' => LoadMorePager::class
],
// ...other GridView options, like 'columns'...
]) ?>
...
That's all that's needed for basic functionality. The Load More button will appear as a
standard link. In a ListView, set the pager
property likewise.
Options
LoadMorePager's options can be set like so:
...
<?= GridView::widget([
'dataProvider' => ...
'pager' => [
'class' => LoadMorePager::class,
'label' => 'Show more data'
],
// ...other GridView options, like 'columns'...
]) ?>
...
LoadMorePager has four options:
label
string
The text of the Load More button. Default: 'Load more'
.
id
string
The HTML ID of the Load More button. If not set (default) it will be auto-generated.
options
array
The HTML options of the Load More button. Set this to something like
[ 'class' => 'btn btn-secondary' ]
to give the button the looks of a real button (assuming that
you use Bootstrap). Default: []
(empty array).
indicator
string
Optional. The CSS selector for the indicator element(s). While the list is waiting
for new items, the indicator element(s) get the extra CSS class 'show'
. Great for showing
a 'spinner' after the Load More button is clicked. Default: null
.
Refinement 1: summary
In its basic setup, LoadMorePager will not update the GridView's or ListView's
summary, if present. To correct that, wrap the {end}
token in the list's
summary
setting
with a <span>
having the class 'summary-end'
. For example:
...
<?= GridView::widget([
'dataProvider' => ...,
'pager' => [
'class' => LoadMorePager::class,
'label' => 'Show more data'
],
'summary' => 'Showing {begin}-<span class="summary-end">{end}</span> of {totalCount} items',
// ...other GridView options, like 'columns'...
]) ?>
...
Refinement 2: efficiency
Clicking the Load More button sends an Ajax call to the server, which sends a complete page back to the browser. Only a small part is actuallly used. This works, but it could be made quite a bit more efficient by taking the following steps.
Put the list in a separate subview
In stead of the usual view file:
// other stuff on the page
...
<?= GridView::widget(...) ?>
...
// more other stuff
...
Create two view files, one main view which renders a subview:
// other stuff on the page
...
<?= $this->render('_loadmore.php', [
'dataProvider' => $dataProvider
]) ?>
...
// more other stuff
...
The subview:
// no other stuff!
<?= GridView::widget(...) ?>
Modify the action function in the controller
Change the usual:
public function actionLoadmore() {
$dataProvider = ...;
return $this->render('loadmore', [
'dataProvider' => $dataProvider,
]);
}
into:
public function actionLoadmore() {
$dataProvider = ...;
if (Yii::$app->request->isAjax) {
return $this->renderAjax('_loadmore', [
'dataProvider' => $dataProvider,
]);
}
return $this->render('loadmore', [
'dataProvider' => $dataProvider,
]);
}
This makes the server only render the subview if an Ajax call is made by the Load More button.
Important: if you use this technique, be sure to set an explicit id
to the GridView
or the ListView, as well as to the LoadMorePager, like so:
...
<?= GridView::widget([
'dataProvider' => ...,
'id' => 'myGrid',
'pager' => [
'class' => LoadMorePager::class,
'id' => 'myPager',
// ...other LoadMorePager options, like 'label'...
],
// ...other GridView options, like 'columns'...
]) ?>
...
How do I change the number of returned items?
Do this by modifying the pagination
value
of the list's dataProvider, like:
$dataProvider = new ActiveDataProvider([
'query' => ... ,
'pagination' => [
'pageSize' => 12
]
]);