{"id":6943,"date":"2022-09-06T01:19:53","date_gmt":"2022-09-05T19:49:53","guid":{"rendered":"https:\/\/jassweb.com\/solved\/solved-how-can-i-use-a-variable-outside-a-function-in-jquery\/"},"modified":"2022-09-06T01:19:53","modified_gmt":"2022-09-05T19:49:53","slug":"solved-how-can-i-use-a-variable-outside-a-function-in-jquery","status":"publish","type":"post","link":"https:\/\/jassweb.com\/solved\/solved-how-can-i-use-a-variable-outside-a-function-in-jquery\/","title":{"rendered":"[Solved] How can I use a variable outside a function in jQuery?"},"content":{"rendered":"

[ad_1]
\n<\/p>\n

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<\/div>\n
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Here’s the order in which that code runs:<\/p>\n

    \n
  1. \n

    The variables index<\/code> and myProduct<\/code> are created and given the initial value undefined<\/code>.<\/p>\n<\/li>\n

  2. \n

    $('.product img')<\/code> is used to look up elements and then click<\/code> is used to assign an event handler to them.<\/p>\n<\/li>\n

  3. \n

    'product'+ (index + 1)+'.php'<\/code> is assigned to myProduct<\/code>; note that index<\/code> is still undefined<\/code>. Since you use it in a math expression ((index + 1)<\/code>), it’s coerced to a number, which is NaN<\/code> because undefined<\/code> has no numeric equivalent. So the overall result is what you see.<\/p>\n<\/li>\n

  4. \n

    Possibly, at some point in the future, someone clicks one of those elements, at which time index<\/code> is set to a new value. This has no effect on myProduct<\/code>.<\/p>\n<\/li>\n<\/ol>\n

    You may want to move the assignment of myProduct<\/code> inside<\/em> the click<\/code> handler, in which case you probably don’t need index<\/code> outside the handler at all:<\/p>\n

    var myProduct;\n$('.product img').click(function () {\n    var index = $( \".product img\" ).index( this );\n    myProduct=\"product\"+ (index + 1)+'.php';\n});\n<\/code><\/pre>\n<\/p><\/div>\n
    <\/div>\n<\/div>\n
                2<\/span> <\/p><\/div>\n<\/div>\n
    [ad_2]<\/p>\n
    solved How can I use a variable outside a function in jQuery? <\/p>\n","protected":false},"excerpt":{"rendered":"
    [ad_1] Here’s the order in which that code runs: The variables index and myProduct are created and given the initial value undefined. $(‘.product img’) is used to look up elements and then click is used to assign an event handler to them. ‘product’+ (index + 1)+’.php’ is assigned to myProduct; note that index is still … Read more<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[320],"tags":[333,388],"class_list":["post-6943","post","type-post","status-publish","format-standard","hentry","category-solved","tag-javascript","tag-jquery"],"yoast_head":"\n[Solved] How can I use a variable outside a function in jQuery? - JassWeb<\/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:\/\/jassweb.com\/solved\/solved-how-can-i-use-a-variable-outside-a-function-in-jquery\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"[Solved] How can I use a variable outside a function in jQuery? - JassWeb\" \/>\n<meta property=\"og:description\" content=\"[ad_1] Here’s the order in which that code runs: The variables index and myProduct are created and given the initial value undefined. $('.product img') is used to look up elements and then click is used to assign an event handler to them. 'product'+ (index + 1)+'.php' is assigned to myProduct; note that index is still ... Read more\" \/>\n<meta property=\"og:url\" content=\"https:\/\/jassweb.com\/solved\/solved-how-can-i-use-a-variable-outside-a-function-in-jquery\/\" \/>\n<meta property=\"og:site_name\" content=\"JassWeb\" \/>\n<meta property=\"article:published_time\" content=\"2022-09-05T19:49:53+00:00\" \/>\n<meta name=\"author\" content=\"Kirat\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Kirat\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"1 minute\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/jassweb.com\/solved\/solved-how-can-i-use-a-variable-outside-a-function-in-jquery\/#article\",\"isPartOf\":{\"@id\":\"https:\/\/jassweb.com\/solved\/solved-how-can-i-use-a-variable-outside-a-function-in-jquery\/\"},\"author\":{\"name\":\"Kirat\",\"@id\":\"https:\/\/jassweb.com\/solved\/#\/schema\/person\/65c9c7b7958150c0dc8371fa35dd7c31\"},\"headline\":\"[Solved] How can I use a variable outside a function in jQuery?\",\"datePublished\":\"2022-09-05T19:49:53+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/jassweb.com\/solved\/solved-how-can-i-use-a-variable-outside-a-function-in-jquery\/\"},\"wordCount\":149,\"publisher\":{\"@id\":\"https:\/\/jassweb.com\/solved\/#organization\"},\"keywords\":[\"javascript\",\"jquery\"],\"articleSection\":[\"Solved\"],\"inLanguage\":\"en-US\"},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/jassweb.com\/solved\/solved-how-can-i-use-a-variable-outside-a-function-in-jquery\/\",\"url\":\"https:\/\/jassweb.com\/solved\/solved-how-can-i-use-a-variable-outside-a-function-in-jquery\/\",\"name\":\"[Solved] How can I use a variable outside a function in jQuery? 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