{"id":836,"date":"2008-10-26T16:45:26","date_gmt":"2008-10-26T16:45:26","guid":{"rendered":"http:\/\/osmeusapontamentos.com\/?p=836"},"modified":"2008-10-26T16:45:26","modified_gmt":"2008-10-26T16:45:26","slug":"geeky-stuff-chamadas-ajax","status":"publish","type":"post","link":"https:\/\/osmeusapontamentos.com\/index.php\/2008\/10\/26\/geeky-stuff-chamadas-ajax\/","title":{"rendered":"geeky stuff: chamadas ajax"},"content":{"rendered":"

Uma das minhas ferramentas favoritas da actualidade \u00e9 o jQuery mas n\u00e3o vale a pena estar sempre a repetir de que forma ela altera todo o processo de desenvolvimento client-side web.<\/p>\n

Algo que passou a ser bastante trivial de fazer foram as chamadas ajax. Por esta altura j\u00e1 toda a gente sabe que a t\u00e9cnica em si mesma n\u00e3o \u00e9 nova<\/a> mas de qualquer forma n\u00e3o fossem um conjunto de t\u00e9cnicas e ferramentas que surgiram nos \u00faltimos anos e ainda estariamos na web1.0<\/p>\n

Assim, para fazermos pedidos Ajax em jQuery temos simplesmente que:<\/p>\n

\n
\n     $.ajax({\n        type: \"GET\",\n        url: endereco.aspx,\n        dataType: \"text\",\n        data: { 'Operation': 'nome',\n                'nome_parametro1': 'valor_parametro1' },\n        success: function(data, textStatus){\n                   alert('ok');\n                 },\n        complete: function(XMLHttpRequest, textStatus){\n                    alert('fim');\n                  },\n        error: function (XMLHttpRequest, textStatus, errorThrown) {\n                  alert(\"erro:\" + XMLHttpRequest.responseText);\n              }\n      });\n\n      alert('teste');<\/pre>\n<\/div>\n
De notar que neste exemplo estou a assumir que o resultado vai ser um peda\u00e7o de JSON.
\nUma quest\u00e3o que conv\u00e9m sempre relembrar \u00e9 que, pelo menos neste exemplo, as chamadas s\u00e3o ass\u00edncronas (\u00e9 o primeiro A de Ajax), e por isso a ordem pelo qual o c\u00f3digo \u00e9 executado pode pregar algumas partidas, ou seja, aquele ultimo alert(‘teste’) poder\u00e1 n\u00e3o correr s\u00f3 depois de completada a instru\u00e7\u00e3o $.ajax j\u00e1 que, a partir do momento em que \u00e9 feita a chamada ajax, esse bocado do c\u00f3digo passa a correr “paralelamente” (n\u00e3o \u00e9, mas quase) ao c\u00f3digo que est\u00e1 na instru\u00e7\u00e3o seguinte (neste caso o alert(‘teste’).
\nDe referir ainda que o bocado que est\u00e1 no “complete” vai ser sempre executado indepdentemente do resultado ter sido “success” ou “error”.<\/p>\n","protected":false},"excerpt":{"rendered":"
Uma das minhas ferramentas favoritas da actualidade \u00e9 o jQuery mas n\u00e3o vale a pena estar sempre a repetir de que forma ela altera todo o processo de desenvolvimento client-side web. Algo que passou a ser bastante trivial de fazer foram as chamadas ajax. Por esta altura j\u00e1 toda a gente sabe que a t\u00e9cnica […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[7],"tags":[350,536],"class_list":["post-836","post","type-post","status-publish","format-standard","hentry","category-ler-ver-ouvir-passear","tag-jquery","tag-programacao"],"yoast_head":"\ngeeky stuff: chamadas ajax - Os Meus Apontamentos<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/osmeusapontamentos.com\/index.php\/2008\/10\/26\/geeky-stuff-chamadas-ajax\/\" \/>\n<meta property=\"og:locale\" content=\"pt_PT\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"geeky stuff: chamadas ajax - Os Meus Apontamentos\" \/>\n<meta property=\"og:description\" content=\"Uma das minhas ferramentas favoritas da actualidade \u00e9 o jQuery mas n\u00e3o vale a pena estar sempre a repetir de que forma ela altera todo o processo de desenvolvimento client-side web. Algo que passou a ser bastante trivial de fazer foram as chamadas ajax. Por esta altura j\u00e1 toda a gente sabe que a t\u00e9cnica […]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/osmeusapontamentos.com\/index.php\/2008\/10\/26\/geeky-stuff-chamadas-ajax\/\" \/>\n<meta property=\"og:site_name\" content=\"Os Meus Apontamentos\" \/>\n<meta property=\"article:published_time\" content=\"2008-10-26T16:45:26+00:00\" \/>\n<meta name=\"author\" content=\"Vitor Silva\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@vitorsilva\" \/>\n<meta name=\"twitter:site\" content=\"@vitorsilva\" \/>\n<meta name=\"twitter:label1\" content=\"Escrito por\" \/>\n\t<meta name=\"twitter:data1\" content=\"Vitor Silva\" \/>\n\t<meta name=\"twitter:label2\" content=\"Tempo estimado de leitura\" \/>\n\t<meta name=\"twitter:data2\" content=\"1 minuto\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/osmeusapontamentos.com\\\/index.php\\\/2008\\\/10\\\/26\\\/geeky-stuff-chamadas-ajax\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/osmeusapontamentos.com\\\/index.php\\\/2008\\\/10\\\/26\\\/geeky-stuff-chamadas-ajax\\\/\"},\"author\":{\"name\":\"Vitor Silva\",\"@id\":\"https:\\\/\\\/osmeusapontamentos.com\\\/#\\\/schema\\\/person\\\/d508df9c3ffc8b4e64a18dbf0ba18dd8\"},\"headline\":\"geeky stuff: chamadas ajax\",\"datePublished\":\"2008-10-26T16:45:26+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/osmeusapontamentos.com\\\/index.php\\\/2008\\\/10\\\/26\\\/geeky-stuff-chamadas-ajax\\\/\"},\"wordCount\":236,\"commentCount\":0,\"publisher\":{\"@id\":\"https:\\\/\\\/osmeusapontamentos.com\\\/#\\\/schema\\\/person\\\/d508df9c3ffc8b4e64a18dbf0ba18dd8\"},\"keywords\":[\"jquery\",\"programa\u00e7\u00e3o\"],\"articleSection\":[\"Ler\\\/ Ver\\\/ Ouvir\\\/ Passear\"],\"inLanguage\":\"pt-PT\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\\\/\\\/osmeusapontamentos.com\\\/index.php\\\/2008\\\/10\\\/26\\\/geeky-stuff-chamadas-ajax\\\/#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/osmeusapontamentos.com\\\/index.php\\\/2008\\\/10\\\/26\\\/geeky-stuff-chamadas-ajax\\\/\",\"url\":\"https:\\\/\\\/osmeusapontamentos.com\\\/index.php\\\/2008\\\/10\\\/26\\\/geeky-stuff-chamadas-ajax\\\/\",\"name\":\"geeky stuff: chamadas ajax - 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