php - Symfony2: Change dropdown values based on another field value -


i'm using symfony 2.3

i have form, in user selects state , city(both dropdowns).

it works expected, live show cities based on selected state user. form works this:

page 1: user selects state

page 2: user selects city (in point, state field locked, , cannot changed. user can change cities)

so how can database state value, , use on page 2 display cities of state, without using ajax.

state form:

->add('state', 'entity', array( "label" => 'name of state(*): ', 'class' => 'principalbundle:state', "attr" => array('class' => 'control-group', 'style' => 'width: 50%', 'rows' => '1'), "property"=>"statename"))

here's city form:

->add('city', 'entity', array( "label" => 'city name (*): ', 'class' => 'principalbundle:cities', "attr" => array('class' => 'control-group', 'style' => 'width: 50%', 'rows' => '1'), "property"=>"cityname"))

i cannot use event listener. tried follow docs, got error:

the 'choices_as_values' not declared

i think due version of symfony. cannot upgrade version either, @ least not yet.

you can use event listener. seems error regarding choices_as_values. introduced in 2.7 mimic how choices used work. in symfony 2.7 keys/values flipped how choices array works, added choices_as_values backwards compatibility (you set true function in old way).

all need remove choices_as_values setting , should go. make sure keys item value , values should display user.

in symfony 2.3:

$builder->add('gender', 'choice', array(     'choices' => array('m' => 'male', 'f' => 'female'), ));

equivalent symfony 2.7:

$builder->add('genre', 'choice', array(     'choices' => array('m' => 'male', 'f' => 'female'),     'choices_as_values' => false, ));

also equivalent in symfony 2.7:

$builder->add('genre', 'choice', array(     'choices' => array('male' => 'm', 'female' => 'f'),     'choices_as_values' => true, ));

equivalent in symfony 3.0:

$builder->add('genre', 'choice', array(     'choices' => array('male' => 'm', 'female' => 'f'),     'choices_as_values' => true, ));

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