The new SimpleForms extension is still under development, but is now functional. Here's an example which shows how to make a simple form for listing the articles in a category. The source is shown first, followed by the resulting form.
{{#form: {{#input: type = select | name = cat | value = {{#request:cat}} | *Select category {{#dpl: namespace = Category | mode = userformat | listseparators = ,\n*%TITLE%,, }} }} {{#input: type = submit | value = List members}} }} {{#if: {{#request:cat}} | {{#dpl:category = {{#request:cat}} }} }}
{{#form: {{#input: type = select
}} {{#input: type = submit | value = List members}} }}
