{"id":17036,"date":"2022-10-22T22:24:23","date_gmt":"2022-10-22T16:54:23","guid":{"rendered":"https:\/\/jassweb.com\/solved\/solved-could-you-help-me-explain-what-this-means\/"},"modified":"2022-10-22T22:24:23","modified_gmt":"2022-10-22T16:54:23","slug":"solved-could-you-help-me-explain-what-this-means","status":"publish","type":"post","link":"https:\/\/jassweb.com\/solved\/solved-could-you-help-me-explain-what-this-means\/","title":{"rendered":"[Solved] Could you help me Explain what this means?"},"content":{"rendered":"

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var list=[\"https:\/\/stackoverflow.com\/questions\/37702877\/Red.jpg\",\"Amber.jpg\",\"Green.jpg\",\"AmberLast.jpg\"];\n<\/code><\/pre>\n
this is an array<\/strong> of names of image sources. <\/p>\n
https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/JavaScript\/Reference\/Global_Objects\/Array<\/a><\/p>\n
  var index = 0;\n<\/code><\/pre>\n
this a variable, it’s called index<\/strong>, and has the value of 0<\/strong> because you can target an element of an array (e.g Amber.jpg) using it’s index<\/strong>. An array’s index by default starts at 0<\/strong> (zero based), so in the ‘list’ array above, the index of 0 (list[0]) will return “https:\/\/stackoverflow.com\/questions\/37702877\/Red.jpg”.<\/p>\n
  function changeLights() {\n\n    var image = document.getElementById(\"https:\/\/stackoverflow.com\/questions\/37702877\/Red.jpg\");\n    var display = document.getElementById('display');\n    index = (index + 1) % 4;\n    image.src = list[index];\n    display.innerHTML = list[index];\n\n  }\n<\/code><\/pre>\n
This function selects the <img><\/code> tag with the ID of “https:\/\/stackoverflow.com\/questions\/37702877\/Red.jpg”, and then sets it’s src= to be index + 1 (= 1)<\/code><\/strong>, and then sets the inner HTML of the element with an ID of display<\/strong> to be Amber.jpg (list[1]).<\/strong> <\/p>\n
The correct way to ‘change lights’ would instead be: <\/p>\n
var list=[\"https:\/\/stackoverflow.com\/questions\/37702877\/Red.jpg\",\"Amber.jpg\",\"Green.jpg\",\"AmberLast.jpg\"];\n\nvar index = 0;\n\nfunction changeLights() {\n\n   var max = list.length - 1;\n   var next = index += 1; \n\n   if(next > max) {\n      next = 0; \/\/start back at beginning\n      index = 0;\n   }  \n\n   var image = document.getElementById('IDOFIMAGETAG'); \/\/replace will correct ID of <img>\n\n   image.src = list[next];\n\n}\n<\/code><\/pre>\n<\/p><\/div>\n
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solved Could you help me Explain what this means? <\/p>\n","protected":false},"excerpt":{"rendered":"
[ad_1] var list=[“https:\/\/stackoverflow.com\/questions\/37702877\/Red.jpg”,”Amber.jpg”,”Green.jpg”,”AmberLast.jpg”]; this is an array of names of image sources. https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/JavaScript\/Reference\/Global_Objects\/Array var index = 0; this a variable, it’s called index, and has the value of 0 because you can target an element of an array (e.g Amber.jpg) using it’s index. An array’s index by default starts at 0 (zero based), so in … 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":[346,333],"class_list":["post-17036","post","type-post","status-publish","format-standard","hentry","category-solved","tag-html","tag-javascript"],"yoast_head":"\n[Solved] Could you help me Explain what this means? - 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-could-you-help-me-explain-what-this-means\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"[Solved] Could you help me Explain what this means? - JassWeb\" \/>\n<meta property=\"og:description\" content=\"[ad_1] var list=["https:\/\/stackoverflow.com\/questions\/37702877\/Red.jpg","Amber.jpg","Green.jpg","AmberLast.jpg"]; this is an array of names of image sources. https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/JavaScript\/Reference\/Global_Objects\/Array var index = 0; this a variable, it’s called index, and has the value of 0 because you can target an element of an array (e.g Amber.jpg) using it’s index. An array’s index by default starts at 0 (zero based), so in ... 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