{"id":742,"date":"2014-05-31T07:18:33","date_gmt":"2014-05-31T07:18:33","guid":{"rendered":"http:\/\/www.masterlevel.de\/blog\/?p=742"},"modified":"2015-01-14T15:33:59","modified_gmt":"2015-01-14T15:33:59","slug":"isset-f-javascript","status":"publish","type":"post","link":"https:\/\/www.masterlevel.de\/blog\/isset-f-javascript\/","title":{"rendered":"isset f. javascript"},"content":{"rendered":"

Auf einer dynamisch erzeugten Seite wurde verschiedene Elemente zur Laufzeit erzeugt. Nun wollte ich mit meinem Script pr\u00fcfen, ob ein bestimmtes input-Feld, Typ „hidden“ existiert…<\/p>\n

Wenn ich mit Javascript checken m\u00f6chte, ob\u00a0ein hidden-Element nach Usereingabe z.B. namens „myVar4“ exisitiert, checke ich das ganz locker mit:<\/p>\n

\r\n\r\nvar test = 0;\r\n\r\n\/\/usereingabe\r\nvar step = 4;\r\n\r\neval("if(typeof myVar"+step + " == 'undefined')test=1");\r\n\r\nif(test == 0){\r\n\r\n\/\/mach was schlaues\r\n\r\n}\r\n\r\n<\/pre>\n
und undynamisch:<\/p>\n
\r\n\r\nif(typeof smmpm != 'undefined' && smmpm == 1){\r\n\/\/mach was schlaues\r\n} <\/pre>\n","protected":false},"excerpt":{"rendered":"
Auf einer dynamisch erzeugten Seite wurde verschiedene Elemente zur Laufzeit erzeugt. Nun wollte ich mit meinem Script pr\u00fcfen, ob ein bestimmtes input-Feld, Typ „hidden“ existiert… Wenn ich mit Javascript checken m\u00f6chte, ob\u00a0ein hidden-Element nach Usereingabe z.B. namens „myVar4“ exisitiert, checke ich das ganz locker mit: var test = 0; \/\/usereingabe var step = 4; eval("if(typeof …<\/p>\n
Read more »<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[95,94],"tags":[],"class_list":["post-742","post","type-post","status-publish","format-standard","hentry","category-javascript-2","category-snippets"],"yoast_head":"\nisset f. javascript - masterlevel<\/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:\/\/www.masterlevel.de\/blog\/isset-f-javascript\/\" \/>\n<meta name=\"twitter:label1\" content=\"Verfasst von\" \/>\n\t<meta name=\"twitter:data1\" content=\"J. Adler\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/www.masterlevel.de\\\/blog\\\/isset-f-javascript\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.masterlevel.de\\\/blog\\\/isset-f-javascript\\\/\"},\"author\":{\"name\":\"J. 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Adler\",\"url\":\"https:\\\/\\\/www.masterlevel.de\\\/blog\\\/author\\\/admin\\\/\"}]}<\/script>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"isset f. javascript - masterlevel","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/www.masterlevel.de\/blog\/isset-f-javascript\/","twitter_misc":{"Verfasst von":"J. Adler"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"Article","@id":"https:\/\/www.masterlevel.de\/blog\/isset-f-javascript\/#article","isPartOf":{"@id":"https:\/\/www.masterlevel.de\/blog\/isset-f-javascript\/"},"author":{"name":"J. 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