Append block to admin login form

Question

I need to append a input field to the admin log in page. I have created an Observer.php hoping to do so. I simply want to add an input to the login form on the admin side.

app\code\local\Wsu\NewtworkSecurities\Model\Observer.php

class Wsu_NewtworkSecurities_Model_Observer extends Mage_Admin_Model_Observer {
 public function appendfeild() {
 echo $this->getLayout()->createBlock('wsu_newtworksecurities/newtworksecurities.feildblock')->toHtml();
 }
}

app\code\local\Wsu\NewtworkSecurities\etc\config.xml

<?xml version="1.0" encoding="utf-8"?>
 <config>
 <modules>
 <Wsu_NewtworkSecurities>
 <version>0.1.0</version>
 </Wsu_NewtworkSecurities>
 </modules>
 <global>
 <events>
 <controller_action_predispatch_adminhtml_index_index>
 <observers>
 <newtworksecurities>
 <class>newtworksecurities/observer</class>
 <method>appendfeild</method>
 </newtworksecurities>
 </observers>
 </controller_action_predispatch_adminhtml_index_index>
 </events>
 </global>
 </config>

app\design\adminhtml\default\default\layout\wsu\newtworksecurities.xml

<?xml version="1.0"?>
<layout version="0.1.0">
 <feildblock>
 <reference name="head">
 <action method="addJs">
 <script>wsu/newtworksecurities/newtworksecurities.js</script>
 </action>
 </reference>
 </feildblock>
 <default>
 <adminhtml_index_login>
 <update handle="feildblock" />
 <reference name="form.additional.info">
 <block type="wsu_newtworksecurities/wsu_newtworksecurities" name="wsu_newtworksecurities">
 <action method="setFormId"><formId>backend_login</formId></action>
 <action method="setImgWidth"><width>226</width></action>
 <action method="setImgHeight"><width>50</width></action>
 </block>
 <block type="wsu_newtworksecurities/feildblock" name="newtworksecurities.feildblock"
 template="wsu/newtworksecurities/feildblock.phtml" />
 </reference>
 </adminhtml_index_login>
 </default>
</layout>

app\design\adminhtml\default\default\template\wsu\newtworksecurities\feildblock.phtml

<input id="url" type="text" name="<?php echo $this->getfeildblock() ?>" />

EDIT

So the answer is that it should be the full package_extension class name in the config events node value. this was the fix, adding the wsu_ to the class value. Although @Vicky hit on another try I did, it was not full solution to appending to the login page. This is what I ended up as

 <controller_action_predispatch_adminhtml_index_login>
 <observers>
 <newtworksecurities>
 <class>wsu_newtworksecurities/observer</class>
 <method>appendfeild</method>
 </newtworksecurities>
 </observers>
 </controller_action_predispatch_adminhtml_index_login>

EDIT 2

Now although it I was able to get to the method I have not been able to get the html from the phtml to show up in the <?php echo $this->getChildHtml('form.additional.info'); ?> . I am expecting that app\design\adminhtml\default\default\template\wsu\newtworksecurities\feildblock.phtml was going to show up but as of yet nothing. I have read that I may be seeing that that block is being over write it's self, I have tried to change the events I'm observing with out change. I'm sure it's hitting my method as I added echo "TEST!!!!"; and I see it right at the top as expected. I don't see that block getting the template.

EDIT 3

It is worth noting that it works for the front end if I just do this, no config event, and use the layout update. So this is what works on the front.

app\design\frontend\base\default\layout\newtworksecurities.xml

<?xml version="1.0"?>
<layout>
 <feildset>
 <reference name="head">
 <action method="addJs">
 <script>wsu/newtworksecurities/newtworksecurities.js</script>
 </action>
 </reference>
 </feildset>
 <customer_account_create>
 <update handle="feildset" />
 <reference name="form.additional.info">
 <block type="wsu_newtworksecurities/feildset" name="newtworksecurities.feildset"
 template="wsu/newtworksecurities/feildset.phtml" />
 </reference>
 </customer_account_create>
 <review_product_list>
 <update handle="feildset" />
 <reference name="product.review.form.fields.before">
    
 <block type="wsu_newtworksecurities/feildset" name="newtworksecurities.feildset"
 template="wsu/newtworksecurities/feildset.phtml" />
 </reference>
 </review_product_list>
 <wsu_newtworksecurities_error_index>
 <reference name="content">
 <block type="core/template" name="newtworksecurities.error" template="wsu/newtworksecurities/error.phtml"/>
 </reference>
 </wsu_newtworksecurities_error_index>
</layout>

app\code\local\Wsu\NewtworkSecurities\etc\config.xml

<?xml version="1.0" encoding="utf-8"?>
 <config>
 <modules>
 <Wsu_NewtworkSecurities>
 <version>0.1.0</version>
 </Wsu_NewtworkSecurities>
 </modules>
 <frontend>
 <layout>
 <updates>
 <wsu_newtworksecurities>
 <file>newtworksecurities.xml</file>
 </wsu_newtworksecurities>
 </updates>
 </layout>
 </frontend>
 </config>

SO this works but I can't get it do work on the login page. I have added

 <admin>
 <layout>
 <updates>
 <wsu_newtworksecurities>
 <file>newtworksecurities.xml</file>
 </wsu_newtworksecurities>
 </updates>
 </layout>
 </admin>

to the config file and in

app\design\adminhtml\default\default\layout\wsu\newtworksecurities.xml

<?xml version="1.0"?>
<layout version="0.1.0">
 <feildset>
 <reference name="head">
 <action method="addJs">
 <script>wsu/newtworksecurities/newtworksecurities.js</script>
 </action>
 </reference>
 </feildset>
 <adminhtml_index_login>
 <update handle="feildset" />
 <reference name="form.additional.info">
 <block type="wsu_newtworksecurities/feildset" name="newtworksecurities.feildset"
 template="wsu/newtworksecurities/feildset.phtml" />
 </reference>
 </adminhtml_index_login>
 <wsu_newtworksecurities_error_index>
 <reference name="content">
 <block type="core/template" name="newtworksecurities.error" template="wsu/newtworksecurities/error.phtml"/>
 </reference>
 </wsu_newtworksecurities_error_index>
</layout>

• Vicky: Are you sure that the event you're observing is the correct one? I would assume it would have to be controller_action_predispatch_adminhtml_index_login. I haven't tested this though.
• Quantum: I did try that one too and it didn't seem to work.. I base the index_index off the url

Answer 1

So the answer is that it should not be an observed event. Here is how I got it to work, in the config.xml I needed to update the adminhtml node.

<?xml version="1.0" encoding="utf-8"?>
<config>
 <modules>
 <Wsu_NewtworkSecurities>
 <version>0.1.0</version>
 </Wsu_NewtworkSecurities>
 </modules>
 <adminhtml>
 <layout>
 <updates>
 <wsu_newtworksecurities>
 <file>newtworksecurities.xml</file>
 </wsu_newtworksecurities>
 </updates>
 </layout>
 </adminhtml>
</config>

and in

app\design\adminhtml\default\default\layout\wsu\newtworksecurities.xml

<?xml version="1.0"?>
<layout version="0.1.0">
 <feildset>
 <reference name="head">
 <action method="addJs">
 <script>wsu/newtworksecurities/newtworksecurities.js</script>
 </action>
 </reference>
 </feildset>
 <adminhtml_index_login>
 <update handle="feildset" />
 <reference name="form.additional.info">
 <block type="wsu_newtworksecurities/feildset" name="newtworksecurities.feildset"
 template="wsu/newtworksecurities/feildset.phtml" />
 </reference>
 </adminhtml_index_login>
 <wsu_newtworksecurities_error_index>
 <reference name="content">
 <block type="core/template" name="newtworksecurities.error" template="wsu/newtworksecurities/error.phtml"/>
 </reference>
 </wsu_newtworksecurities_error_index>
</layout>