{"id":52046,"date":"2023-04-13T07:32:03","date_gmt":"2023-04-13T07:32:03","guid":{"rendered":"https:\/\/kinsta.com\/se\/?p=52046&#038;post_type=knowledgebase&#038;preview_id=52046"},"modified":"2025-10-01T20:00:50","modified_gmt":"2025-10-01T20:00:50","slug":"uncaught-typeerror-cannot-set-property","status":"publish","type":"post","link":"https:\/\/kinsta.com\/se\/blog\/uncaught-typeerror-cannot-set-property\/","title":{"rendered":"S\u00e5 h\u00e4r \u00e5tg\u00e4rdar du felet &#8221;uncaught typeerror: cannot set property&#8221; i JavaScript"},"content":{"rendered":"<p>Som webbutvecklare kommer du s\u00e4kert att st\u00f6ta p\u00e5 fel n\u00e4r du arbetar med <a href=\"https:\/\/kinsta.com\/blog\/what-is-javascript\/\">JavaScript<\/a>. Kodningsfel hindrar applikationen fr\u00e5n att g\u00f6ra det som f\u00f6rv\u00e4ntas.<\/p>\n<p>F\u00f6r att kunna \u00e5tg\u00e4rda dessa fel m\u00e5ste du kunna f\u00f6rst\u00e5 felmeddelandet. Det hj\u00e4lper dig n\u00e4mligen att f\u00f6rst\u00e5 varf\u00f6r felet uppstod och hur du kan \u00e5tg\u00e4rda det.<\/p>\n<p>I den h\u00e4r handledningen kommer vi att prata om felet &#8221;uncaught typeerror: cannot set property&#8221; i JavaScript.<\/p>\n<p>Du kommer att l\u00e4ra dig varf\u00f6r det h\u00e4r felet uppst\u00e5r, de olika orsakerna till varf\u00f6r du kan st\u00f6ta p\u00e5 det och d\u00e4refter olika metoder f\u00f6r att \u00e5tg\u00e4rda det.<\/p>\n<div><\/div><kinsta-auto-toc heading=\"Table of Contents\" exclude=\"last\" list-style=\"arrow\" selector=\"h2\" count-number=\"-1\"><\/kinsta-auto-toc>\n<h2>Vad betyder &#8221;Uncaught Typeerror: Cannot Set Property&#8221; i JavaScript?<\/h2>\n<p>Ett <code>typeerror<\/code> uppst\u00e5r fr\u00e4mst n\u00e4r du utf\u00f6r en operation som involverar inkompatibla datatyper. I v\u00e5rt fall handlar det om felet &#8221;uncaught typeerror: cannot set property&#8221;. Det \u00e4r ett <a href=\"https:\/\/kinsta.com\/blog\/errors-in-javascript\/\">JavaScript-fel<\/a> som huvudsakligen uppst\u00e5r n\u00e4r du f\u00f6rs\u00f6ker tilldela en egenskap till ett DOM-element med ett <code>null<\/code>-v\u00e4rde.<\/p>\n<p>Felet kan uppst\u00e5 av olika anledningar, exempelvis:<\/p>\n<ul>\n<li>Placering av <code>script<\/code>-taggen p\u00e5 fel plats i din markup<\/li>\n<li>Stavfel n\u00e4r du h\u00e4nvisar till DOM-element<\/li>\n<li>\u00c5tkomst till ett odefinierat eller ogiltigt DOM-element<\/li>\n<\/ul>\n<p>I de f\u00f6ljande avsnitten diskuterar vi orsakerna ovan. Vi visar dig sedan hur de kan orsaka felet &#8221;uncaught typeerror: cannot set property&#8221; med kod-exempel och hur du \u00e5tg\u00e4rdar detta.<\/p>\n<p>Vi kommer dessutom att tala om hur du kan avg\u00f6ra om en variabel \u00e4r <code>null<\/code> eller <code>undefined<\/code>.<\/p>\n<p>Nu s\u00e4tter vi ig\u00e5ng!<\/p>\n<h2>S\u00e5 h\u00e4r \u00e5tg\u00e4rdar du &#8221;uncaught typeerror: cannot set property&#8221; i JavaScript<\/h2>\n<p>I det h\u00e4r avsnittet f\u00e5r du l\u00e4ra k\u00e4nna de vanligaste orsakerna till felet &#8221;uncaught typeerror: cannot set property&#8221; i JavaScript. Varje underavsnitt som f\u00f6ljer \u00e4r till\u00e4gnat en av dessa orsaker och dess l\u00f6sning.<\/p>\n<p>Du kommer dessutom att f\u00e5 visualisera hur du \u00e5tg\u00e4rdar felet med n\u00e5gra praktiska kod-exempel.<\/p>\n<h3>Felaktig placering av <code>script<\/code>-taggen<\/h3>\n<p>N\u00e4r en webbsida laddas s\u00e5 laddas \u00e4ven den JavaScript-kod som har skrivits f\u00f6r sidan. Det s\u00e4tt p\u00e5 vilket JavaScript k\u00e4nner igen Document Object Model (DOM) \u00e4r beroende av var du placerar <code>script<\/code>-taggen i din kod.<\/p>\n<p>Om du placerar <code>script<\/code>-taggen inom <code>head<\/code>-taggen eller ovanf\u00f6r alla <a href=\"https:\/\/kinsta.com\/blog\/what-is-html\/\">HTML-element<\/a> inom <code>body<\/code>-taggen kommer skriptet att exekveras innan DOM \u00e4r klar.<\/p>\n<p>N\u00e4r JavaScript k\u00f6rs innan DOM \u00e4r redo f\u00e5r det inte en fullst\u00e4ndig representation av DOM. Som ett resultat s\u00e5 kommer de flesta av dina variabler som \u00e4r kopplade till DOM-element att \u00e5terges som <code>null<\/code>.<\/p>\n<p>H\u00e4r \u00e4r ett exempel p\u00e5 en kod som skulle ge upphov till felet &#8221;uncaught typeerror: cannot set property&#8221; i JavaScript p\u00e5 grund av positionen f\u00f6r <code>script<\/code>-taggen:<\/p>\n<pre><code class=\"language-html\">&lt;!DOCTYPE html&gt;\n&lt;html&gt;\n  &lt;head&gt;\n    &lt;title&gt;Uncaught Typeerror Error Tutorial&lt;\/title&gt;\n    &lt;script src=\"app.js\"&gt;&lt;\/script&gt;\n  &lt;\/head&gt;\n  &lt;body&gt;\n    &lt;h1 id=\"heading\"&gt;&lt;\/h1&gt;\n  &lt;\/body&gt;\n&lt;\/html&gt;<\/code><\/pre>\n<p>I koden ovan \u00e4r <code>script<\/code>-taggen placerad inom <code>head<\/code>-taggen. Vi har dessutom ett <code>h1<\/code>-element med en <code>id<\/code> av <code>heading<\/code>.<\/p>\n<p>D\u00e4refter ska vi f\u00f6rs\u00f6ka tilldela text till <code>h1<\/code>-elementet:<\/p>\n<pre><code class=\"language-js\">let heading = document.getElementById('heading');\nheading.textContent = 'This is a heading';\n\/\/Uncaught TypeError: Cannot set properties of null (setting 'textContent')<\/code><\/pre>\n<p>\u00c4ven om koden ovan ser bra ut, uppstod felet &#8221;uncaught typeerror: cannot set property&#8221;. Detta h\u00e4nde eftersom skriptet redan hade laddats f\u00f6re DOM. V\u00e5r JavaScript hade med andra ord ingen kunskap om DOM-elementen.<\/p>\n<p>Det h\u00e4r felet kommer dessutom att uppst\u00e5 om du placerar <code>script<\/code>-taggen ovanf\u00f6r andra DOM-element:<\/p>\n<pre><code class=\"language-html\">&lt;!DOCTYPE html&gt;\n&lt;html&gt;\n  &lt;head&gt;\n    &lt;title&gt;Uncaught Typeerror Error Tutorial&lt;\/title&gt;\n  &lt;\/head&gt;\n  &lt;body&gt;\n    &lt;script src=\"app.js\"&gt;&lt;\/script&gt;\n    &lt;h1 id=\"heading\"&gt;&lt;\/h1&gt;\n  &lt;\/body&gt;\n&lt;\/html&gt;<\/code><\/pre>\n<p>Nu ligger <code>script<\/code>-taggen ovanf\u00f6r DOM-elementen i <code>body<\/code>-taggen. Den kommer dock fortfarande att ge upphov till felet &#8221;uncaught typeerror: cannot set property&#8221; eftersom skriptet laddas f\u00f6re DOM.<\/p>\n<p>F\u00f6r att \u00e5tg\u00e4rda detta fel m\u00e5ste du placera <code>script<\/code>-taggen precis f\u00f6re den avslutande <code>body<\/code>-taggen. P\u00e5 s\u00e5 s\u00e4tt kommer alla DOM-element att laddas f\u00f6re skriptet.<\/p>\n<p>H\u00e4r \u00e4r ett exempel p\u00e5 korrekt placering:<\/p>\n<pre><code class=\"language-html\">&lt;!DOCTYPE html&gt;\n&lt;html&gt;\n  &lt;head&gt;\n    &lt;title&gt;Uncaught Typeerror Error Tutorial&lt;\/title&gt;\n  &lt;\/head&gt;\n  &lt;body&gt;\n    &lt;h1 id=\"heading\"&gt;&lt;\/h1&gt;\n    &lt;script src=\"app.js\"&gt;&lt;\/script&gt;\n  &lt;\/body&gt;\n&lt;\/html&gt;<\/code><\/pre>\n<pre><code class=\"language-js\">let heading = document.getElementById('heading');\nheading.textContent = 'This is a heading'<\/code><\/pre>\n<p>N\u00e4r koden ovan utf\u00f6rs kommer elementet <code>h1<\/code> att ha <code>textContent<\/code> inst\u00e4llt p\u00e5 &#8221;Detta \u00e4r en rubrik&#8221;. Det kommer d\u00e4rf\u00f6r inte att uppst\u00e5 n\u00e5got fel.<\/p>\n<h3>Stavfel<\/h3>\n<p>Stavfel \u00e4r en annan k\u00e4lla till felet &#8221;uncaught typeerror: cannot set property&#8221;.<\/p>\n<p>N\u00e4r du stavar fel p\u00e5 attributet (ID eller klass) som anv\u00e4nds f\u00f6r att identifiera ett DOM-element i JavaScript h\u00e4nvisar du till ett element som inte existerar. Som ett resultat kommer du att f\u00e5 tillbaka ett <code>null<\/code>-v\u00e4rde.<\/p>\n<p>Om du f\u00f6rs\u00f6ker att tilldela ett v\u00e4rde till ett <code>null<\/code>-v\u00e4rde uppst\u00e5r felet &#8221;uncaught typeerror: cannot set property&#8221;.<\/p>\n<p>H\u00e4r \u00e4r ett kod-exempel f\u00f6r att hj\u00e4lpa dig att f\u00f6rst\u00e5:<\/p>\n<pre><code class=\"language-html\">&lt;!DOCTYPE html&gt;\n&lt;html&gt;\n  &lt;head&gt;\n    &lt;title&gt;Uncaught Typeerror Error Tutorial&lt;\/title&gt;\n  &lt;\/head&gt;\n  &lt;body&gt;\n    &lt;h1 id=\"heading\"&gt;&lt;\/h1&gt;\n    &lt;script src=\"app.js\"&gt;&lt;\/script&gt;\n  &lt;\/body&gt;\n&lt;\/html&gt;<\/code><\/pre>\n<pre><code class=\"language-js\">let heading = document.getElementById('headin');\nheading.textContent = 'Hello World!'\n\/\/Uncaught TypeError: Cannot set properties of null (setting 'textContent')<\/code><\/pre>\n<p>I koden ovan har vi en <code>h1<\/code>-tagg med en <code>id<\/code> av <code>heading<\/code>.<\/p>\n<p>I JavaScript-koden h\u00e4nvisade vi till <code>id<\/code> men med ett stavfel. I st\u00e4llet f\u00f6r &#8221;heading&#8221; skrev vi &#8221;headin&#8221; &#8211; det vill s\u00e4ga <code>document.getElementById('headin');<\/code> i st\u00e4llet f\u00f6r <code>document.getElementById('heading');<\/code>.<\/p>\n<p>F\u00f6r att undvika s\u00e5dana h\u00e4r fel b\u00f6r du alltid se till att dina DOM-element refereras till p\u00e5 r\u00e4tt s\u00e4tt. Detta kan exempelvis uppn\u00e5s genom anv\u00e4ndning av r\u00e4tt attribut med r\u00e4tt stavning.<\/p>\n<h3>\u00c5tkomst till ett odefinierat DOM-element<\/h3>\n<p>I f\u00f6rra avsnittet s\u00e5g vi hur h\u00e4nvisning till ett felstavat attribut kan ge upphov till felet &#8221;uncaught typeerror: cannot set property&#8221;. Samma sak g\u00e4ller n\u00e4r vi f\u00f6rs\u00f6ker komma \u00e5t ett DOM-element som inte finns.<\/p>\n<p>I exemplet nedan f\u00f6rs\u00f6ker vi f\u00e5 tillg\u00e5ng till attributet <code>id<\/code> som \u00e4nnu inte har definierats i uppslaget:<\/p>\n<pre><code class=\"language-html\">&lt;!DOCTYPE html&gt;\n&lt;html&gt;\n  &lt;head&gt;\n    &lt;title&gt;Uncaught Typeerror Error Tutorial&lt;\/title&gt;\n  &lt;\/head&gt;\n  &lt;body&gt;\n    &lt;h1&gt;&lt;\/h1&gt;\n    &lt;script src=\"app.js\"&gt;&lt;\/script&gt;\n  &lt;\/body&gt;\n&lt;\/html&gt;<\/code><\/pre>\n<pre><code class=\"language-js\">let heading = document.getElementById('headin');\nheading.textContent = 'Hello World!'\n\/\/Uncaught TypeError: Cannot set properties of null (setting 'textContent')<\/code><\/pre>\n<p>Som det framg\u00e5r ovan f\u00f6rs\u00f6ker vi ange <code>textContent<\/code> f\u00f6r ett DOM-element som inte finns. Det finns inget element i v\u00e5r HTML-kod som har <code>id<\/code> av &#8221;heading&#8221;. Som ett resultat s\u00e5 returneras ett <code>null<\/code>-v\u00e4rde.<\/p>\n<p>Om du forts\u00e4tter att logga variabeln <code>heading<\/code> till konsolen f\u00e5r du tillbaka v\u00e4rdet <code>null<\/code>.<\/p>\n<h2>Hur man best\u00e4mmer om en variabel \u00e4r &#8221;null&#8221; eller &#8221;odefinierad&#8221;<\/h2>\n<p>Vid det h\u00e4r laget har du f\u00f6rst\u00e5tt att om du tilldelar ett v\u00e4rde till en variabel som \u00e4r <code>null<\/code> eller <code>undefined<\/code> kommer det troligen att ge upphov till ett &#8221;uncaught typeerror: cannot set property&#8221;-fel.<\/p>\n<p>Men du kan avg\u00f6ra om en variabel \u00e4r <code>null<\/code> eller <code>undefined<\/code>; innan du interagerar med den. \u00c4ven om detta inte \u00e5tg\u00e4rdar felet ger det exempelvis en viss klarhet om varf\u00f6r en funktionalitet inte fungerar.<\/p>\n<p>Innan vi diskuterar hur man best\u00e4mmer om en variabel \u00e4r <code>null<\/code> eller <code>undefined<\/code> i JavaScript \u00e4r det viktigt att f\u00f6rst\u00e5 skillnaden mellan ett <code>null<\/code>-v\u00e4rde och ett <code>undefined<\/code>-v\u00e4rde.<\/p>\n<p>En variabel \u00e4r <code>null<\/code> n\u00e4r ett tomt eller ok\u00e4nt v\u00e4rde tilldelas variabeln. De tidigare avsnitten i den h\u00e4r handledningen visar praktiska exempel p\u00e5 en <code>null<\/code>-variabel.<\/p>\n<p>\u00c5 andra sidan s\u00e5 \u00e4r en variabel <code>undefined<\/code> n\u00e4r inget v\u00e4rde har tilldelats den:<\/p>\n<pre><code class=\"language-js\">let age;\nconsole.log(age);\n\/\/ undefined<\/code><\/pre>\n<p>I koden ovan har variabeln <code>age<\/code> deklarerats, men inget v\u00e4rde har tilldelats den. Vid loggning till konsolen returnerades <code>undefined<\/code>.<\/p>\n<p>Nu n\u00e4r du vet skillnaden mellan <code>null<\/code> och <code>undefined<\/code>, ska vi titta p\u00e5 hur du kan avg\u00f6ra om en variabel \u00e4r n\u00e5gon av dem.<\/p>\n<p>Du kan anv\u00e4nda den l\u00f6sa likhetsoperatorn (<code>==<\/code>) f\u00f6r att avg\u00f6ra om en variabel \u00e4r antingen <code>null<\/code> eller <code>undefined<\/code>. H\u00e4r \u00e4r ett exempel:<\/p>\n<pre><code class=\"language-html\">&lt;!DOCTYPE html&gt;\n&lt;html&gt;\n  &lt;head&gt;\n    &lt;title&gt;Uncaught Typeerror Error Tutorial&lt;\/title&gt;\n  &lt;\/head&gt;\n  &lt;body&gt;\n    &lt;h1 id=\"headin\"&gt;&lt;\/h1&gt;\n    &lt;script src=\"app.js\"&gt;&lt;\/script&gt;\n  &lt;\/body&gt;\n&lt;\/html&gt;<\/code><\/pre>\n<pre><code class=\"language-js\">let heading = document.getElementById('headin');\nif (heading == null) {\nconsole.log('Variable is null - cannot assign value to a null variable');\n} else {\nheading.textContent = 'Hello World!';\n}<\/code><\/pre>\n<p>I koden ovan gjorde vi ett stavfel n\u00e4r vi h\u00e4nvisade till ett DOM-element i JavaScript.<\/p>\n<p>Med hj\u00e4lp av ett <code>if<\/code>-meddelande kontrollerade vi om v\u00e4rdet av variabeln <code>heading<\/code> var <code>null<\/code>: <code>if (heading == null) {...}<\/code><\/p>\n<p>Eftersom det returnerade ett <code>null<\/code>-v\u00e4rde skulle &#8221;Variable is null &#8211; cannot assign value to a null variable&#8221; loggas ut i konsolen. Om vi inte hade f\u00e5tt ett <code>null<\/code>-v\u00e4rde skulle koden i blocket <code>else<\/code> ha utf\u00f6rts.<\/p>\n<p>Undrar du varf\u00f6r vi inte inkluderade <code>undefined<\/code> i <code>if<\/code>-anvisningen? Detta beror det p\u00e5 att <code>null == undefined<\/code> i JavaScript, s\u00e5 koden i <code>if<\/code>-anvisningen kontrollerar b\u00e5da felen.<\/p>\n<h2>Sammanfattning<\/h2>\n<p>Felmeddelanden kan vara f\u00f6rvirrande i vissa fall, men de hj\u00e4lper utvecklare att ta reda p\u00e5 varf\u00f6r deras kod inte fungerar s\u00e5 att de kan \u00e5tg\u00e4rda den och undvika framtida h\u00e4ndelser.<\/p>\n<p>\u00c4ven om ingen \u00e4lskar fel s\u00e5 \u00e4r de ett bra s\u00e4tt att f\u00f6rst\u00e5 <a href=\"https:\/\/kinsta.com\/se\/blog\/basta-programmeringsspraket-att-lara-sig\/\">ditt favoritprogrammeringsspr\u00e5k<\/a> b\u00e4ttre.<\/p>\n\n<p>Att \u00e5tg\u00e4rda ett kodningsfel ger dig dessutom ett b\u00e4ttre sammanhang n\u00e4r du st\u00f6ter p\u00e5 ett liknande fel i ett annat projekt. Felet som vi har diskuterat i den h\u00e4r artikeln uppkommer inte bara n\u00e4r du arbetar med vanilla JavaScript-projekt. du kan dessutom st\u00f6ta p\u00e5 detta n\u00e4r du arbetar med <a href=\"https:\/\/kinsta.com\/se\/blog\/javascript-biblioteken\/\">JavaScript-ramverk och -bibliotek<\/a>.<\/p>\n<p>Om du ska bygga en app eller webbplats finns det en m\u00e4ngd olika <a href=\"https:\/\/kinsta.com\/blog\/frontend-developer\/\">f\u00e4rdigheter att l\u00e4ra sig<\/a>. Det <a href=\"https:\/\/kinsta.com\/se\/topics\/javascript-sjalvstudier\/\">kr\u00e4vs dessutom mycket \u00f6vning<\/a> f\u00f6r att anv\u00e4nda dessa f\u00e4rdigheter p\u00e5 ett effektivt s\u00e4tt. Kinsta&#8217;s nya <a href=\"https:\/\/sevalla.com\/pricing\/\">Hobby Niv\u00e5<\/a> erbjuder den perfekta hosting-plattformen f\u00f6r alla som beh\u00f6ver ett utrymme f\u00f6r att \u00f6va. Det g\u00e4ller allt ifr\u00e5n spirande nya kodare till erfarna utvecklare som vill marknadsf\u00f6ra sitt arbete eller distribuera proof-of-concept-appar. Och om du registrerar dig f\u00f6r <a href=\"https:\/\/sevalla.com\/pricing\/\">n\u00e5gon niv\u00e5<\/a> idag f\u00e5r du 20 dollar i rabatt p\u00e5 din f\u00f6rsta m\u00e5nad.<\/p>\n<kinsta-video src=\"https:\/\/www.youtube.com\/watch?v=vmNem6wxfSQ\"><\/kinsta-video>\n","protected":false},"excerpt":{"rendered":"<p>Som webbutvecklare kommer du s\u00e4kert att st\u00f6ta p\u00e5 fel n\u00e4r du arbetar med JavaScript. Kodningsfel hindrar applikationen fr\u00e5n att g\u00f6ra det som f\u00f6rv\u00e4ntas. F\u00f6r att kunna &#8230;<\/p>\n","protected":false},"author":240,"featured_media":52047,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_kinsta_gated_content":false,"_kinsta_gated_content_redirect":"","footnotes":""},"tags":[],"topic":[782],"class_list":["post-52046","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","topic-javascript-fel"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v24.6 (Yoast SEO v24.6) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>S\u00e5 h\u00e4r \u00e5tg\u00e4rdar du felet &quot;uncaught typeerror: cannot set property&quot; i JavaScript - Kinsta\u00ae<\/title>\n<meta name=\"description\" content=\"Meddelandet&quot;uncaught typeerror: cannot set property&quot; i JavaScript kan ha m\u00e5nga orsaker. 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