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<!doctype html><html lang=en dir=ltr class="docs-wrapper plugin-docs plugin-id-default docs-version-current docs-doc-page docs-doc-id-Form_extension" data-has-hydrated=false><meta charset=UTF-8><meta name=generator content="Docusaurus v3.7.0"><title data-rh=true>Form extension | lsfusion documentation</title><meta data-rh=true name=viewport content="width=device-width, initial-scale=1.0"><meta data-rh=true name=twitter:card content=summary_large_image><meta data-rh=true property=og:url content=https://lsfusion.github.io/Form_extension/><meta data-rh=true property=og:locale content=en><meta data-rh=true property=og:locale:alternate content=ru><meta data-rh=true name=docusaurus_locale content=en><meta data-rh=true name=docsearch:language content=en><meta data-rh=true name=docusaurus_version content=current><meta data-rh=true name=docusaurus_tag content=docs-default-current><meta data-rh=true name=docsearch:version content=current><meta data-rh=true name=docsearch:docusaurus_tag 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itemprop=item href=/Development/><span itemprop=name>Development</span></a><meta itemprop=position content=3><li itemscope itemprop=itemListElement itemtype=https://schema.org/ListItem class=breadcrumbs__item><a class=breadcrumbs__link itemprop=item href=/Modularity/><span itemprop=name>Modularity</span></a><meta itemprop=position content=4><li itemscope itemprop=itemListElement itemtype=https://schema.org/ListItem class=breadcrumbs__item><a class=breadcrumbs__link itemprop=item href=/Extensions/><span itemprop=name>Extensions</span></a><meta itemprop=position content=5><li itemscope itemprop=itemListElement itemtype=https://schema.org/ListItem class="breadcrumbs__item breadcrumbs__item--active"><span class=breadcrumbs__link itemprop=name>Form extension</span><meta itemprop=position content=6></ul></nav><span class="theme-doc-version-badge badge badge--secondary">Version: 6.x</span><div class="tocCollapsible_ETCw theme-doc-toc-mobile tocMobile_ITEo"><button type=button class="clean-btn tocCollapsibleButton_TO0P">On this page</button></div><div class="theme-doc-markdown markdown"><header><h1>Form extension</h1></header><p>The <a href=/Forms/>form</a> <a href=/Extensions/>extension</a> technique allows the developer to extend the <a href=/Form_structure/>structure</a> and <a href=/Interactive_view/>design</a> of a form created in another module.</p>
<p>Form extension allows you to extract a specific functionality into a separate module, which when loaded will cause new components to be "embedded" into existing forms. The disadvantage of this approach is that this module must know the precise structure and design of the form which it depends on, and when these are modified the module may become inoperative.</p>
<h3 class="anchor anchorWithStickyNavbar_LWe7" id=language>Language<a href=#language class=hash-link aria-label="Direct link to Language" title="Direct link to Language"></a></h3>
<p>In order to extend the structure and design of an existing form, the <a href=/EXTEND_FORM_statement/><code>EXTEND FORM</code> statement</a> must be used.</p>
<h3 class="anchor anchorWithStickyNavbar_LWe7" id=example>Example<a href=#example class=hash-link aria-label="Direct link to Example" title="Direct link to Example"></a></h3>
<div class="language-lsf codeBlockContainer_Ckt0 theme-code-block" style=--prism-color:#403f53;--prism-background-color:#FBFBFB><div class=codeBlockContent_biex><pre tabindex=0 class="prism-code language-lsf codeBlock_bY9V thin-scrollbar" style=color:#403f53;background-color:#FBFBFB><code class=codeBlockLines_e6Vv><span class=token-line style=color:#403f53><span class="token plain">CLASS ItemGroup;</span><br></span><span class=token-line style=color:#403f53><span class="token plain">name = DATA ISTRING[100] (ItemGroup);</span><br></span><span class=token-line style=color:#403f53><span class="token plain" style=display:inline-block></span><br></span><span class=token-line style=color:#403f53><span class="token plain">itemGroup = DATA ItemGroup (Item);</span><br></span><span class=token-line style=color:#403f53><span class="token plain" style=display:inline-block></span><br></span><span class=token-line style=color:#403f53><span class="token plain">EXTEND FORM items</span><br></span><span class=token-line style=color:#403f53><span class="token plain"> PROPERTIES(i) NEWSESSION DELETE // adding a delete button to the form</span><br></span><span class=token-line style=color:#403f53><span class="token plain" style=display:inline-block></span><br></span><span class=token-line style=color:#403f53><span class="token plain"> OBJECTS g = ItemGroup BEFORE i // adding a product group object to the form before the product</span><br></span><span class=token-line style=color:#403f53><span class="token plain"> PROPERTIES(g) READONLY name</span><br></span><span class=token-line style=color:#403f53><span class="token plain"> // if the object was added after the object with products, then filtering </span><br></span><span class=token-line style=color:#403f53><span class="token plain"> // would go by the group of products, and not by products</span><br></span><span class=token-line style=color:#403f53><span class="token plain"> FILTERS itemGroup(i) == g 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