Sandbox

{{#form:}}

{{#input:type=hidden|name=title|value=Sandbox}} {{#input:type=hidden|name=summary|value=Article category updated from form}} {{#input:type=hidden|name=caction|value=append}} {{#input:type=hidden|name=regexp|id=setcat-regexp}} {{#input:type=hidden|name=content|id=setcat-content}}

{{#input: type = select | *Select category{{#dpl: namespace = Category | format = ,\n*%TITLE%,, }} | onChange = document.getElementById('setcat-regexp').setAttribute('value','\\[\\[Category:'+this.value+'.*?\\]\\]'); document.getElementById('setcat-content').setAttribute('value','['+'[Category:'+this.value+']'+']'); }}

{{#input:type=submit|value=Categorise!}} {{#formend:}}