PHP Foreach 里面创建一个新对象
我对如何修改以下代码有点困惑,该代码生成一个表单,以允许 $Show->DateTimes()
自动生成一组新字段并根据情况填充价格有多少个日期可用。
我不确定这是否可能。虽然我在注释中添加了 foreach 来解释我认为它应该如何工作,但我认为我只是把我的 PHP 搞混了。
我现在有这个代码:
编辑:最终固定代码:
public function RegistrationForm() {
$date_id = (int) $this->getRequest()->requestVar('DateID');
if(!$date = DataObject::get_by_id("ShowDateTime", $date_id)) {
return $this->httpError(404);
}
$date_map = array();
if($Show = $date->Show()) {
if($all_dates = $Show->DateTimes()) {
$date_map = $all_dates->toDropdownMap('Price','DateLabel');
}
}
$fields = new Fieldset (
new TextField('Event', _t('Show.Event','Name of Event'),$Show->Title),
new EmailField('Name', _t('Show.Name','Name')),
new EmailField('Email', _t('Show.Email','Email')),
new TextField('Address', _t('Show.Address','Address')),
new TextField('Telephone', _t('Show.Telephone','Telephone')),
new DropdownField('DateID', _t('Show.CHOOSEDATE','Choose a show'), $date_map, $date_id)
);
// Loop through the time/events creating a fieldset for: class,horse,number,price
$i =0;
foreach($all_dates as $show_price){
$fields->push(new TextField('Class_'.$i, 'Class'));
$fields->push(new TextField('Horse_'.$i, 'Horse'));
$fields->push(new TextField('Number_'.$i, 'Number'));
$fields->push(new CurrencyField('Price_'.$i, 'Price',$show_price->Price));
$i++;
}
$form = new Form (
$this,
"RegistrationForm",
$fields,
new FieldSet (
new FormAction('doRegister', _t('Show.REGISTER','Register'))
),
new RequiredFields('Event','Name','DateID')
);
return $form;
}
I'm a little confused about how I can amend the following code that generates a form to allow for the $Show->DateTimes()
to automatically generate a set of new fields and populate the price depending on how many dates are available.
I'm not sure if this is even possible. Although I have added the foreach inside the comments explaining how I think it should work, I think I just have my PHP mixed up.
I have this code at the moment:
EDIT: Final fixed code:
public function RegistrationForm() {
$date_id = (int) $this->getRequest()->requestVar('DateID');
if(!$date = DataObject::get_by_id("ShowDateTime", $date_id)) {
return $this->httpError(404);
}
$date_map = array();
if($Show = $date->Show()) {
if($all_dates = $Show->DateTimes()) {
$date_map = $all_dates->toDropdownMap('Price','DateLabel');
}
}
$fields = new Fieldset (
new TextField('Event', _t('Show.Event','Name of Event'),$Show->Title),
new EmailField('Name', _t('Show.Name','Name')),
new EmailField('Email', _t('Show.Email','Email')),
new TextField('Address', _t('Show.Address','Address')),
new TextField('Telephone', _t('Show.Telephone','Telephone')),
new DropdownField('DateID', _t('Show.CHOOSEDATE','Choose a show'), $date_map, $date_id)
);
// Loop through the time/events creating a fieldset for: class,horse,number,price
$i =0;
foreach($all_dates as $show_price){
$fields->push(new TextField('Class_'.$i, 'Class'));
$fields->push(new TextField('Horse_'.$i, 'Horse'));
$fields->push(new TextField('Number_'.$i, 'Number'));
$fields->push(new CurrencyField('Price_'.$i, 'Price',$show_price->Price));
$i++;
}
$form = new Form (
$this,
"RegistrationForm",
$fields,
new FieldSet (
new FormAction('doRegister', _t('Show.REGISTER','Register'))
),
new RequiredFields('Event','Name','DateID')
);
return $form;
}
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在
$form = new Form (
中,您不能放置循环表达式。您只能在其中放置简单的表达式,例如$variable
或new
因此首先将对象列表生成到它自己的变量(或一个数组)中,然后将其添加到
Form 构造函数中 。要获取包含字段的 FieldSet 对象,您可以创建一个新对象并进行操作。向其中添加字段,然后将此对象传递到构造函数中,请考虑以下替代方法:
Inside the
$form = new Form (
you can not place a loop expression. You can only put simple expressions in there, like a$variable
ornew
. But nothing that needs a higher level of execution.So first generate a list of the objects into variables of it's own (or one array) and then add it to
$form
.The Form constructor expects to get a FieldSet object containing the fields. You can create a new one and add the fields to it and then pass this object into the constructor. Consider the following, alternative approach: