{"id":76,"date":"2025-02-13T01:07:36","date_gmt":"2025-02-12T23:07:36","guid":{"rendered":"https:\/\/typo3demosite.com\/?p=76"},"modified":"2025-02-13T01:15:29","modified_gmt":"2025-02-12T23:15:29","slug":"viewhelper-to-access-get-and-post-parameters-from-any-fluid-template","status":"publish","type":"post","link":"https:\/\/typo3demosite.com\/?p=76","title":{"rendered":"ViewHelper to Access GET and POST Parameters from Any Fluid Template"},"content":{"rendered":"\n

In TYPO3 Fluid templates, accessing GET or POST parameters directly isn\u2019t straightforward. However, creating a custom ViewHelper to fetch these values can unlock dynamic template rendering based on URL or form data. This article guides you through building a ViewHelper to retrieve GET\/POST parameters and demonstrates practical use cases, such as conditionally rendering content on a news detail page.<\/p>\n\n\n\n

Why Access GET\/POST Parameters in Fluid?<\/h3>\n\n\n\n

While TYPO3 discourages direct access to superglobals (e.g., $_GET<\/code>) in templates for security reasons, there are valid scenarios where you might need them:<\/p>\n\n\n\n

    \n
  1. Dynamic Content Rendering<\/strong>: Show\/hide template sections based on URL parameters (e.g., ?tx_news_pi1[news]=123<\/code>).<\/li>\n\n\n\n
  2. Form Handling<\/strong>: Display success messages after form submissions via POST.<\/li>\n\n\n\n
  3. Filtering<\/strong>: Build UIs that react to query parameters (e.g., search filters).<\/li>\n<\/ol>\n\n\n\n

    A ViewHelper provides a clean, reusable way to handle such cases while keeping logic decoupled from templates.<\/p>\n\n\n\n

    Writing custom ViewHelper<\/h3>\n\n\n\n

    Create a custom ViewHelper in your TYPO3 extension to fetch GET\/POST parameters.<\/p>\n\n\n\n

    <\/circle><\/circle><\/circle><\/g><\/svg><\/span><\/path><\/path><\/svg><\/span>
    \/\/ ...\/extension\/Classes\/ViewHelpers\/QueryParamsViewHelper.php<\/span><\/span>\n<\/span>\n<?<\/span>php<\/span><\/span>\n<\/span>\nnamespace<\/span> Vendor<\/span>\\<\/span>Extension<\/span>\\<\/span>ViewHelpers<\/span>;<\/span><\/span>\n<\/span>\nuse<\/span> TYPO3Fluid<\/span>\\<\/span>Fluid<\/span>\\<\/span>Core<\/span>\\<\/span>ViewHelper<\/span>\\<\/span>AbstractViewHelper<\/span>;<\/span><\/span>\nuse<\/span> TYPO3<\/span>\\<\/span>CMS<\/span>\\<\/span>Core<\/span>\\<\/span>Http<\/span>\\<\/span>ServerRequest<\/span>;<\/span><\/span>\n<\/span>\nclass<\/span> <\/span>QueryParamsViewHelper<\/span> <\/span>extends<\/span> <\/span>AbstractViewHelper<\/span><\/span>\n{<\/span><\/span>\n    <\/span>public<\/span> <\/span>function<\/span> <\/span>initializeArguments<\/span>()<\/span>:<\/span> <\/span>void<\/span><\/span>\n    <\/span>{<\/span><\/span>\n        <\/span>parent::<\/span>initializeArguments<\/span>()<\/span>;<\/span><\/span>\n        <\/span>$this-><\/span>registerArgument<\/span>(<\/span>'<\/span>parameter<\/span>'<\/span>,<\/span> <\/span>'<\/span>string<\/span>'<\/span>,<\/span> <\/span>'<\/span>Name of the parameter to fetch (use | for nested parameters)<\/span>'<\/span>,<\/span> <\/span>true<\/span>)<\/span>;<\/span><\/span>\n        <\/span>$this-><\/span>registerArgument<\/span>(<\/span>'<\/span>method<\/span>'<\/span>,<\/span> <\/span>'<\/span>string<\/span>'<\/span>,<\/span> <\/span>'<\/span>Request method (GET or POST)<\/span>'<\/span>,<\/span> <\/span>false<\/span>,<\/span> <\/span>'<\/span>GET<\/span>'<\/span>)<\/span>;<\/span><\/span>\n    <\/span>}<\/span><\/span>\n<\/span>\n    <\/span>public<\/span> <\/span>function<\/span> <\/span>render<\/span>()<\/span><\/span>\n    <\/span>{<\/span><\/span>\n        <\/span>$<\/span>parameterPath<\/span> <\/span>=<\/span> <\/span>$this-><\/span>arguments<\/span>[<\/span>'<\/span>parameter<\/span>'<\/span>]<\/span>;<\/span><\/span>\n        <\/span>$<\/span>method<\/span> <\/span>=<\/span> <\/span>strtoupper<\/span>(<\/span>$this-><\/span>arguments<\/span>[<\/span>'<\/span>method<\/span>'<\/span>])<\/span>;<\/span><\/span>\n<\/span>\n        <\/span>if<\/span> <\/span>((<\/span>$<\/span>GLOBALS<\/span>[<\/span>'<\/span>TYPO3_REQUEST<\/span>'<\/span>]<\/span> <\/span>??<\/span> <\/span>null<\/span>)<\/span> <\/span>instanceof<\/span> <\/span>ServerRequest<\/span>)<\/span> <\/span>{<\/span><\/span>\n            <\/span>$<\/span>request<\/span> <\/span>=<\/span> <\/span>$<\/span>GLOBALS<\/span>[<\/span>'<\/span>TYPO3_REQUEST<\/span>'<\/span>]<\/span>;<\/span><\/span>\n<\/span>\n            <\/span>if<\/span> <\/span>(<\/span>$<\/span>method<\/span> <\/span>===<\/span> <\/span>'<\/span>POST<\/span>'<\/span>)<\/span> <\/span>{<\/span><\/span>\n                <\/span>$<\/span>params<\/span> <\/span>=<\/span> <\/span>$<\/span>request<\/span>-><\/span>getParsedBody<\/span>()<\/span>;<\/span><\/span>\n            <\/span>}<\/span> <\/span>else<\/span> <\/span>{<\/span><\/span>\n                <\/span>$<\/span>params<\/span> <\/span>=<\/span> <\/span>$<\/span>request<\/span>-><\/span>getQueryParams<\/span>()<\/span>;<\/span><\/span>\n            <\/span>}<\/span><\/span>\n        <\/span>}<\/span> <\/span>else<\/span> <\/span>{<\/span><\/span>\n            <\/span>$<\/span>params<\/span> <\/span>=<\/span> <\/span>(<\/span>$<\/span>method<\/span> <\/span>===<\/span> <\/span>'<\/span>POST<\/span>'<\/span>)<\/span> <\/span>?<\/span> <\/span>$<\/span>_POST<\/span> <\/span>:<\/span> <\/span>$<\/span>_GET<\/span>;<\/span><\/span>\n        <\/span>}<\/span><\/span>\n<\/span>\n        <\/span>if<\/span> <\/span>(<\/span>str_contains<\/span>(<\/span>$<\/span>parameterPath<\/span>,<\/span> <\/span>'<\/span>|<\/span>'<\/span>))<\/span> <\/span>{<\/span><\/span>\n            <\/span>$<\/span>parts<\/span> <\/span>=<\/span> <\/span>explode<\/span>(<\/span>'<\/span>|<\/span>'<\/span>,<\/span> <\/span>$<\/span>parameterPath<\/span>)<\/span>;<\/span><\/span>\n            <\/span>$<\/span>value<\/span> <\/span>=<\/span> <\/span>$<\/span>params<\/span>;<\/span><\/span>\n<\/span>\n            <\/span>foreach<\/span> <\/span>(<\/span>$<\/span>parts<\/span> <\/span>as<\/span> <\/span>$<\/span>part<\/span>)<\/span> <\/span>{<\/span><\/span>\n                <\/span>if<\/span> <\/span>(<\/span>is_array<\/span>(<\/span>$<\/span>value<\/span>)<\/span> <\/span>&&<\/span> <\/span>isset<\/span>(<\/span>$<\/span>value<\/span>[<\/span>$<\/span>part<\/span>]))<\/span> <\/span>{<\/span><\/span>\n                    <\/span>$<\/span>value<\/span> <\/span>=<\/span> <\/span>$<\/span>value<\/span>[<\/span>$<\/span>part<\/span>]<\/span>;<\/span><\/span>\n                <\/span>}<\/span> <\/span>else<\/span> <\/span>{<\/span><\/span>\n                    <\/span>return<\/span> <\/span>null;<\/span><\/span>\n                <\/span>}<\/span><\/span>\n            <\/span>}<\/span><\/span>\n<\/span>\n            <\/span>return<\/span> <\/span>$<\/span>value<\/span>;<\/span><\/span>\n        <\/span>}<\/span><\/span>\n<\/span>\n        <\/span>return<\/span> <\/span>$<\/span>params<\/span>[<\/span>$<\/span>parameterPath<\/span>]<\/span> <\/span>??<\/span> <\/span>null;<\/span><\/span>\n    <\/span>}<\/span><\/span>\n}<\/span><\/span>\n<\/span><\/code><\/pre><\/div>\n\n\n\n
    Use the ViewHelper in Fluid Templates<\/h3>\n\n\n\n
    First of all, lets declare or ViewHelper’s namespace in the template:<\/p>\n\n\n\n
    <\/circle><\/circle><\/circle><\/g><\/svg><\/span><\/path><\/path><\/svg><\/span>
    <html<\/span><\/span>\n    <\/span>xmlns:e<\/span>=<\/span>"<\/span>http:\/\/typo3.org\/ns\/Vendor\/Extension\/ViewHelpers<\/span>"<\/span><\/span>\n    <\/span>data-namespace-typo<\/span>3<\/span>-fluid<\/span>=<\/span>"<\/span>true<\/span>"<\/span><\/span>\n><\/span><\/span><\/code><\/pre><\/div>\n\n\n\n
    An now we can access it as we need:<\/p>\n\n\n\n
    <\/circle><\/circle><\/circle><\/g><\/svg><\/span><\/path><\/path><\/svg><\/span>
    <f:if<\/span> <\/span>condition<\/span>=<\/span>"<\/span>{e:queryParams(parameter: 'tx_news_pi1|news')} > 0<\/span>"<\/span>><\/span><\/span>\n  <\/span><f:then><\/span><\/span>\n    <\/span><!-- Render detail view --><\/span><\/span>\n    <\/span><h1><\/span>News ID: {e:queryParams(parameter: 'tx_news_pi1|news')}<\/span><\/h1><\/span><\/span>\n    .....<\/span><\/span>\n  <\/span><\/f:then><\/span><\/span>\n  <\/span><f:else><\/span><\/span>\n    <\/span><!-- Render list view --><\/span><\/span>\n    <\/span><f:render<\/span> <\/span>partial<\/span>=<\/span>"<\/span>NewsList<\/span>"<\/span> \/<\/span>><\/span><\/span>\n    .......<\/span><\/span>\n  <\/span><\/f:else><\/span><\/span>\n<\/f:if><\/span><\/span><\/code><\/pre><\/div>\n","protected":false},"excerpt":{"rendered":"
    In TYPO3 Fluid templates, accessing GET or POST parameters directly isn\u2019t straightforward. However, creating a […]<\/p>\n","protected":false},"author":1,"featured_media":77,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[3],"tags":[8,6,4],"class_list":["post-76","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-typo3","tag-fluid","tag-integration","tag-typo3"],"_links":{"self":[{"href":"https:\/\/typo3demosite.com\/index.php?rest_route=\/wp\/v2\/posts\/76","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/typo3demosite.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/typo3demosite.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/typo3demosite.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/typo3demosite.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=76"}],"version-history":[{"count":2,"href":"https:\/\/typo3demosite.com\/index.php?rest_route=\/wp\/v2\/posts\/76\/revisions"}],"predecessor-version":[{"id":79,"href":"https:\/\/typo3demosite.com\/index.php?rest_route=\/wp\/v2\/posts\/76\/revisions\/79"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/typo3demosite.com\/index.php?rest_route=\/wp\/v2\/media\/77"}],"wp:attachment":[{"href":"https:\/\/typo3demosite.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=76"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/typo3demosite.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=76"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/typo3demosite.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=76"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}