How to select all fields in multi-select on single click in magento 1.9

Question

I am working in magento 1.9 . I am making a muliselect field. I want to select all fields on single click . Did magento 1.9 gave such tag by default ? . My code in system.xml looks like .

<serviceOptions>
    <label>Domestic Services </label>
    <frontend_type>multiselect</frontend_type>
    <source_model>FedExSmall/Source_FedExSmallServices</source_model>
    <sort_order>12</sort_order>
    <show_in_default>1</show_in_default>
    <show_in_website>1</show_in_website>
    <can_be_empty>1</can_be_empty>
    <show_in_store>1</show_in_store>
</serviceOptions>

Thank you in advance !

Answer 1

You can do with xml, js

1. Add checkbox input after your <serviceOptions> node like this:

   <checkall translate="label">
       <label>Check all services</label>
       <class>Check-all-services</class>
       <frontend_type>checkbox</frontend_type>
       <sort_order>13</sort_order>
       <show_in_default>1</show_in_default>
       <show_in_website>1</show_in_website>
       <show_in_store>1</show_in_store>
   </checkall>
   

2. You add this js code in your js admin

   $('#sd_general_general_checkall').click(function() {
       if($('#sd_general_general_checkall').is(":checked")) {
           $('#sd_general_general_serviceOptions option').prop('selected', true);
       } else {
           $('#sd_general_general_serviceOptions option').prop('selected', false);
       }
   });
   

3. Just if you haven't an admin js, you can it like this:

   app/design/adminhtml/default/default/layout/local.xml

   <?xml version="1.0"?>
   <layout version="0.1.0">
       <adminhtml_system_config_edit>
           <reference name="head">
               <action method="addJs"><script>admin/my-custom-admin.js</script></action>
           </reference>
       </adminhtml_system_config_edit>
   </layout>
   

4. js/admin/my-custom-admin.js

   //put the content of the setp 2
   

Important: In step 2 you have to change the id's #sd_general_general_checkall, #sd_general_general_serviceOptions with the yours. if you encounter difficulties, post your full xml.