Add option to Magento system admin

Geoffrey Published at Dev

Geoffrey

I would like to add a textbox to the Header block located inside System>Config>Design>Header, the location in the image below.

I know this has to be done in xml, but I am not sure where. Also how would I display that in an phtml file?

Rabea

In code/core/Mage/Page/etc/system.xml you will find the configuration that Magento reads to show those fields, for example the "Small Logo Image src" is a field called logo_src_small. The needed is a module that will tell Magento about:

The extra field in the admin panel under header.

<config>
    <sections>
        <design>
            <groups>
            <header>
            <fields>
            <new_field translate="label">
              <label>New Field</label>
              <frontend_type>text</frontend_type>
              <sort_order>1</sort_order>
              <show_in_default>1</show_in_default>
              <show_in_website>1</show_in_website>
              <show_in_store>1</show_in_store>
            </new_field>
            </fields>
            </header>
            </groups>
        </design>
    </section>
</config>

Rewrite the block class code/core/Mage/Page/Block/Html/Header.php so you can add the method that will expose the new field.
In the app/design/frontend/{Package}/{Theme}/template/page/html/header.phtml you can easily call $this->getNewField() where getNewField() is the method you have in the class we overridden in point 2.

A couple of links to help you start:

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