Sometimes I want to add custom fields in magento admin configuration section through custom module and I want set the default value which post I have called as “Default value for admin field of custom module in magento”.For that I need to have a system.xml file having all the fileds inside my custom groups of custom section.Suppose, I have the following system.xml file. System.xml file is necessary to add admin configuration options.Here I have set my configuration section under catalog tab.
/app/code/local/NameSpace/ModuleName/etc/system.xml
.Set yout default value for configuration filed in magento.
<?xml version="1.0" encoding="UTF-8"?>
<config>
<sections>
<customsection translate="label" module="custommodule">
<label>Custom Section</label>
<tab>catalog</tab>
<frontend_type>text</frontend_type>
<sort_order>110</sort_order>
<show_in_default>1</show_in_default>
<show_in_website>1</show_in_website>
<show_in_store>1</show_in_store>
<groups>
<customgroup translate="label" module="custommodule">
<label>Custom Group</label>
<frontend_type>text</frontend_type>
<sort_order>99</sort_order>
<show_in_default>1</show_in_default>
<show_in_website>1</show_in_website>
<show_in_store>1</show_in_store>
<fields>
<customfield translate="label comment">
<label>Custom 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>
</customfield>
</fields>
</customgroup>
</groups>
</customsection>
</sections>
</config>
Now, to add Default value for admin field of custom module in magento, you need to write the following in config.xml file of your module.
/app/code/local/NameSpace/ModuleName/etc/config.xml
<config>
...........
...........
<default>
<customsection>
<customgroup>
<customfield>Custom Default Value</customfield>
</customgroup>
</customsection>
</default>
...........
...........
</config>
Default value for admin field of custom module in magento
