{"id":1363,"date":"2022-08-30T15:15:54","date_gmt":"2022-08-30T15:15:54","guid":{"rendered":"https:\/\/unknownerror.org\/index.php\/2013\/11\/13\/why-is-document-formsmyforminput-value-return-undefined-collection-of-common-programming-errors\/"},"modified":"2022-08-30T15:15:54","modified_gmt":"2022-08-30T15:15:54","slug":"why-is-document-formsmyforminput-value-return-undefined-collection-of-common-programming-errors","status":"publish","type":"post","link":"https:\/\/unknownerror.org\/index.php\/2022\/08\/30\/why-is-document-formsmyforminput-value-return-undefined-collection-of-common-programming-errors\/","title":{"rendered":"Why is document.forms[“myform”][“input”].value return undefined-Collection of common programming errors"},"content":{"rendered":"

So here’s me trying to make a HTML5 version of the Tone Matrix program. So here’s the problem, I have the user enter how long they want their song to be and then to make sure they entered a number, so i used<\/p>\n

  function initiate(){\n  var min = document.forms[\"initiator\"][\"min\"].value;\n  var sec = document.forms[\"initiator\"][\"sec\"].value;\n  \/\/ some logic\n  return false;}\n<\/code><\/pre>\n
to check to see if the stuff they entered is indeed a number but when I try to do this, the browser spits back “Uncaught TypeError: Cannot read property ‘min’ of undefined” here’s what’s in my DOM.<\/p>\n
\nYour song will be (at most):  minutes and  seconds long.
\n\n
\n<\/code><\/pre>\n
i have also placed the thing onto a hosting service located here http:\/\/www.sfu.ca\/~zla49\/MMC\/ so ya Thanks \ud83d\ude42<\/p>\n
    \n
  1. \n
    You don’t have a name<\/code> on your form.<\/p>\n
    It should look like<\/p>\n
    What may be more beneficial, if you don’t want to name the form is to pass the form object as a parameter:<\/p>\n
    function initiate(form){\n  var min = form[\"min\"].value;\n  var sec = form[\"sec\"].value;\n  \/\/ some logic\n  return false;\n}\n\n\n\n<\/code><\/pre>\n<\/li>\n<\/ol>\n
    Originally posted 2013-11-13 09:49:57. <\/small><\/p>","protected":false},"excerpt":{"rendered":"
    So here’s me trying to make a HTML5 version of the Tone Matrix program. So here’s the problem, I have the user enter how long they want their song to be and then to make sure they entered a number, so i used function initiate(){ var min = document.forms[“initiator”][“min”].value; var sec = document.forms[“initiator”][“sec”].value; \/\/ some […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-1363","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"_links":{"self":[{"href":"https:\/\/unknownerror.org\/index.php\/wp-json\/wp\/v2\/posts\/1363","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/unknownerror.org\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/unknownerror.org\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/unknownerror.org\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/unknownerror.org\/index.php\/wp-json\/wp\/v2\/comments?post=1363"}],"version-history":[{"count":0,"href":"https:\/\/unknownerror.org\/index.php\/wp-json\/wp\/v2\/posts\/1363\/revisions"}],"wp:attachment":[{"href":"https:\/\/unknownerror.org\/index.php\/wp-json\/wp\/v2\/media?parent=1363"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/unknownerror.org\/index.php\/wp-json\/wp\/v2\/categories?post=1363"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/unknownerror.org\/index.php\/wp-json\/wp\/v2\/tags?post=1363"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}