{"id":50010,"date":"2023-04-13T08:31:41","date_gmt":"2023-04-13T07:31:41","guid":{"rendered":"https:\/\/kinsta.com\/dk\/?p=50010&#038;post_type=knowledgebase&#038;preview_id=50010"},"modified":"2025-10-01T20:02:59","modified_gmt":"2025-10-01T19:02:59","slug":"uncaught-typeerror-cannot-set-property","status":"publish","type":"post","link":"https:\/\/kinsta.com\/dk\/blog\/uncaught-typeerror-cannot-set-property\/","title":{"rendered":"S\u00e5dan l\u00f8ser du &#8220;uncaught typeerror: cannot set property&#8221; Fejl i JavaScript"},"content":{"rendered":"<p>Som webudvikler kan du ikke undg\u00e5 at st\u00f8de p\u00e5 fejl, n\u00e5r du arbejder med <a href=\"https:\/\/kinsta.com\/blog\/what-is-javascript\/\">JavaScript<\/a>. Kodningsfejl forhindrer applikationen i at g\u00f8re det, der forventes.<\/p>\n<p>For at kunne rette disse fejl skal du v\u00e6re i stand til at forst\u00e5 fejlmeddelelsen, da dette vil hj\u00e6lpe dig med at forst\u00e5, hvorfor fejlen blev udl\u00f8st, og hvordan du kan rette den.<\/p>\n<p>I denne vejledning vil vi tale om &#8220;uncaught typeerror: cannot set property&#8221;-fejlen i JavaScript.<\/p>\n<p>Du l\u00e6rer hvorfor denne fejl opst\u00e5r, de forskellige \u00e5rsager til at du kan st\u00f8de p\u00e5 den, og de forskellige metoder til at rette den.<\/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>Hvad betyder &#8220;Uncaught Typeerror: Cannot Set Property&#8221; betyder i JavaScript?<\/h2>\n<p>En <code>typeerror<\/code> opst\u00e5r prim\u00e6rt, n\u00e5r du udf\u00f8rer en operation, der involverer inkompatible datatyper. I vores tilf\u00e6lde er der tale om fejlen &#8220;uncaught typeerror: cannot set property&#8221;, en <a href=\"https:\/\/kinsta.com\/blog\/errors-in-javascript\/\">JavaScript-fejl<\/a>, som prim\u00e6rt opst\u00e5r, n\u00e5r du fors\u00f8ger at tildele en egenskab til et DOM-element med en <code>null<\/code> -v\u00e6rdi.<\/p>\n<p>Denne fejl kan opst\u00e5 af forskellige \u00e5rsager som f.eks:<\/p>\n<ul>\n<li>Placering af <code>script<\/code> tagget i den forkerte position i dit markup<\/li>\n<li>Stavefejl, n\u00e5r du henviser til DOM-elementer<\/li>\n<li>Adgang til et udefineret eller ugyldigt DOM-element<\/li>\n<\/ul>\n<p>I de f\u00f8lgende afsnit vil vi diskutere ovenst\u00e5ende \u00e5rsager, hvordan de kan for\u00e5rsage fejlen &#8220;uncaught typeerror: cannot set property&#8221; med kodeeksempler, og hvordan du kan rette fejlen.<\/p>\n<p>Vi vil ogs\u00e5 tale om, hvordan du kan afg\u00f8re, om en variabel er <code>null<\/code> eller <code>undefined<\/code>.<\/p>\n<p>Lad os komme i gang!<\/p>\n<h2>S\u00e5dan retter du &#8220;uncaught typeerror: cannot set property&#8221; i JavaScript<\/h2>\n<p>I dette afsnit f\u00e5r du kendskab til de almindelige \u00e5rsager til fejlen &#8220;uncaught typeerror: cannot set property&#8221; i JavaScript. Hvert underafsnit, der f\u00f8lger, er dedikeret til en af disse \u00e5rsager og dens l\u00f8sning.<\/p>\n<p>Du f\u00e5r ogs\u00e5 visualiseret, hvordan du kan rette fejlen med nogle praktiske kodeeksempler.<\/p>\n<h3>Ugyldig placering af <code>script<\/code> Tag<\/h3>\n<p>N\u00e5r en webside indl\u00e6ses, indl\u00e6ses den JavaScript-kode, der er skrevet til siden, ogs\u00e5. Den m\u00e5de, som JavaScript genkender Document Object Model (DOM) p\u00e5, afh\u00e6nger af, hvor du placerer <code>script<\/code> -tagget i din kode.<\/p>\n<p>Hvis du placerer <code>script<\/code> -tagget inden for <code>head<\/code> -tagget eller over alle <a href=\"https:\/\/kinsta.com\/blog\/what-is-html\/\">HTML-elementer<\/a> inden for <code>body<\/code> -tagget, vil scriptet blive udf\u00f8rt, f\u00f8r DOM er klar.<\/p>\n<p>N\u00e5r JavaScript k\u00f8res, f\u00f8r DOM er klar, f\u00e5r det ikke en fuldst\u00e6ndig repr\u00e6sentation af DOM &#8211; hvilket betyder, at de fleste af dine variabler, der er knyttet til DOM-elementer, returneres som <code>null<\/code>.<\/p>\n<p>Her er et eksempel p\u00e5 en kode, der ville give anledning til fejlen &#8220;uncaught typeerror: cannot set property&#8221; i JavaScript p\u00e5 grund af placeringen af <code>script<\/code> -tagget:<\/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 ovenst\u00e5ende kode er <code>script<\/code> -tagget placeret inden for <code>head<\/code> -tagget. Vi har ogs\u00e5 et <code>h1<\/code> -element med et <code>id<\/code> af <code>heading<\/code>.<\/p>\n<p>Dern\u00e6st vil vi fors\u00f8ge at tildele tekst til <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>Selv om ovenst\u00e5ende kode ser fint ud, blev fejlen &#8220;uncaught typeerror: cannot set property&#8221; udl\u00f8st. Dette skete, fordi scriptet allerede var indl\u00e6st f\u00f8r DOM, s\u00e5 vores JavaScript havde ingen viden om DOM-elementerne.<\/p>\n<p>Denne fejl vil ogs\u00e5 opst\u00e5, hvis du placerer <code>script<\/code> -tagget over andre DOM-elementer:<\/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> -tagget over DOM-elementerne i <code>body<\/code> -tagget, men det vil stadig give anledning til fejlen &#8220;uncaught typeerror: cannot set property&#8221;, fordi scriptet indl\u00e6ses f\u00f8r DOM.<\/p>\n<p>For at rette denne fejl skal du s\u00e6tte <code>script<\/code> -tagget lige f\u00f8r det afsluttende <code>body<\/code> -tag. P\u00e5 denne m\u00e5de vil alle DOM-elementer blive indl\u00e6st f\u00f8r scriptet.<\/p>\n<p>Her er et eksempel 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\u00e5r ovenst\u00e5ende kode udf\u00f8res, vil <code>textContent<\/code> -elementet <code>h1<\/code> f\u00e5 indstillet til &#8220;This is a header&#8221;. Der vil ikke opst\u00e5 nogen fejl.<\/p>\n<h3>Stavefejl<\/h3>\n<p>Stavefejl er en anden kilde til at udl\u00f8se fejlen &#8220;uncaught typeerror: cannot set property&#8221;.<\/p>\n<p>N\u00e5r du staver forkert i den attribut (ID eller klasse), der bruges til at identificere et DOM-element i JavaScript, henviser du til et ikke-eksisterende element, hvilket returnerer en <code>null<\/code> -v\u00e6rdi.<\/p>\n<p>Hvis du fors\u00f8ger at tildele en v\u00e6rdi til en <code>null<\/code> -v\u00e6rdi, opst\u00e5r fejlen &#8220;uncaught typeerror: cannot set property&#8221;.<\/p>\n<p>Her er et kodeeksempel til at hj\u00e6lpe dig med at forst\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 ovenfor har vi et <code>h1<\/code> tag med <code>id<\/code> p\u00e5 <code>heading<\/code>.<\/p>\n<p>I JavaScript-koden har vi henvist til <code>id<\/code>, men med en stavefejl. I stedet for &#8220;heading&#8221; skrev vi &#8220;headin&#8221; &#8211; dvs. <code>document.getElementById('headin');<\/code> i stedet for <code>document.getElementById('heading');<\/code>.<\/p>\n<p>For at undg\u00e5 s\u00e5danne fejl skal du altid s\u00f8rge for, at dine DOM-elementer refereres korrekt ved hj\u00e6lp af den rigtige attribut med den rigtige stavem\u00e5de.<\/p>\n<h3>Adgang til et udefineret DOM-element<\/h3>\n<p>I sidste afsnit s\u00e5 vi, hvordan henvisning til en forkert stavet attribut kan give anledning til en &#8220;uncaught typeerror: cannot set property&#8221;-fejl. Det samme er tilf\u00e6ldet, n\u00e5r vi fors\u00f8ger at f\u00e5 adgang til et DOM-element, der ikke eksisterer.<\/p>\n<p>I eksemplet nedenfor fors\u00f8ger vi at f\u00e5 adgang til en <code>id<\/code> -attribut, som endnu ikke er defineret i markup&#8217;en:<\/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 fremg\u00e5r ovenfor, fors\u00f8ger vi at indstille <code>textContent<\/code> for et DOM-element, der ikke eksisterer. Der er intet element i vores HTML-kode, der har <code>id<\/code> med &#8220;heading&#8221;, s\u00e5 dette returnerer en <code>null<\/code> -v\u00e6rdi.<\/p>\n<p>Hvis du forts\u00e6tter med at logge variablen <code>heading<\/code> til konsollen, f\u00e5r du en v\u00e6rdi p\u00e5 <code>null<\/code> returneret.<\/p>\n<h2>S\u00e5dan bestemmer du, om en variabel er &#8220;null&#8221; eller &#8220;undefined&#8221;<\/h2>\n<p>P\u00e5 dette tidspunkt har du forst\u00e5et, at tildeling af en v\u00e6rdi til en variabel, der er <code>null<\/code> eller <code>undefined<\/code>, h\u00f8jst sandsynligt vil give anledning til en &#8220;uncaught typeerror: cannot set property&#8221;-fejl.<\/p>\n<p>Men du kan afg\u00f8re, om en variabel er <code>null<\/code> eller <code>undefined<\/code>; f\u00f8r du interagerer med den. Selv om dette ikke l\u00f8ser fejlen, giver det noget klarhed over, hvorfor en funktionalitet ikke virker.<\/p>\n<p>F\u00f8r vi diskuterer, hvordan du kan afg\u00f8re, om en variabel er <code>null<\/code> eller <code>undefined<\/code> i JavaScript, er det vigtigt at forst\u00e5 forskellen mellem en <code>null<\/code> &#8211; og en <code>undefined<\/code> -v\u00e6rdi.<\/p>\n<p>En variabel er <code>null<\/code>, n\u00e5r der er tildelt en tom eller ukendt v\u00e6rdi til variablen. De foreg\u00e5ende afsnit i denne vejledning viser praktiske eksempler p\u00e5 en <code>null<\/code> -variabel.<\/p>\n<p>P\u00e5 den anden side er en variabel <code>undefined<\/code>, n\u00e5r der ikke er blevet tildelt nogen v\u00e6rdi til den:<\/p>\n<pre><code class=\"language-js\">let age;\nconsole.log(age);\n\/\/ undefined<\/code><\/pre>\n<p>I ovenst\u00e5ende kode er variablen <code>age<\/code> erkl\u00e6ret, men der er ikke tildelt den nogen v\u00e6rdi. Ved logning til konsollen blev der returneret <code>undefined<\/code>.<\/p>\n<p>Nu hvor du kender forskellen mellem <code>null<\/code> og <code>undefined<\/code>, skal vi se p\u00e5, hvordan du kan afg\u00f8re, om en variabel er en af dem.<\/p>\n<p>Du kan bruge den l\u00f8se lighedsoperator (<code>==<\/code>) til at bestemme, om en variabel er enten <code>null<\/code> eller <code>undefined<\/code>. Her er et eksempel:<\/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 ovenfor har vi lavet en stavefejl, da vi henviste til et DOM-element i JavaScript.<\/p>\n<p>Ved hj\u00e6lp af en <code>if<\/code> -anvisning kontrollerede vi, om v\u00e6rdien af <code>heading<\/code> -variablen var <code>null<\/code>: <code>if (heading == null) {...}<\/code><\/p>\n<p>Da den returnerede en <code>null<\/code> v\u00e6rdi, ville &#8220;Variable is null &#8211; cannot assign value to a null variable&#8221; blive logget ud i konsollen. Hvis vi ikke havde f\u00e5et en <code>null<\/code> -v\u00e6rdi, ville koden i <code>else<\/code> -blokken v\u00e6re blevet udf\u00f8rt.<\/p>\n<p>Hvis du undrer dig over, hvorfor vi ikke medtog <code>undefined<\/code> i <code>if<\/code> -erkl\u00e6ringen, skyldes det, at <code>null == undefined<\/code> i JavaScript, s\u00e5 koden i <code>if<\/code> -erkl\u00e6ringen kontrollerer for begge fejl.<\/p>\n<h2>Opsummering<\/h2>\n<p>Fejlmeddelelser kan i nogle tilf\u00e6lde v\u00e6re forvirrende, men de hj\u00e6lper udviklere med at finde ud af, hvorfor deres kode ikke fungerer, s\u00e5 de kan rette den og undg\u00e5 fremtidige h\u00e6ndelser.<\/p>\n<p>Selv om ingen elsker fejl, er de en god m\u00e5de at hj\u00e6lpe dig med at forst\u00e5 <a href=\"https:\/\/kinsta.com\/blog\/best-programming-language-to-learn\/\">dit foretrukne programmeringssprog<\/a> bedre.<\/p>\n\n<p>Desuden giver det at rette en kodningsfejl dig mere kontekst, n\u00e5r du st\u00f8der p\u00e5 en lignende fejl i et andet projekt. Den fejl, vi har diskuteret i denne artikel, opst\u00e5r ikke kun, n\u00e5r du arbejder p\u00e5 vanilla JavaScript-projekter &#8211; du kan ogs\u00e5 st\u00f8de p\u00e5 den, n\u00e5r du arbejder med <a href=\"https:\/\/kinsta.com\/dk\/blog\/javascript-biblioteker\/\">JavaScript-frameworks og -biblioteker<\/a>.<\/p>\n<p>Hvis du skal bygge en app eller et websted, er der en r\u00e6kke <a href=\"https:\/\/kinsta.com\/blog\/frontend-developer\/\">f\u00e6rdigheder, der skal l\u00e6res<\/a>, og der <a href=\"https:\/\/kinsta.com\/dk\/emner\/javascript-tutorials\/\">kr\u00e6ves en masse \u00f8velse<\/a> for at bruge disse f\u00e6rdigheder effektivt. Kinstas nye <a href=\"https:\/\/sevalla.com\/pricing\/\">Hobby Tier<\/a> er den perfekte hostingplatform for alle, der har brug for et sted at \u00f8ve sig, lige fra spirende nye kodere til erfarne udviklere, der \u00f8nsker at reklamere for deres arbejde eller udrulle proof-of-concept-apps. Og hvis du tilmelder <a href=\"https:\/\/sevalla.com\/pricing\/\">dig et hvilket som helst niveau<\/a> i dag, f\u00e5r du 20 dollars i rabat p\u00e5 din f\u00f8rste m\u00e5ned.<\/p>\n<kinsta-video src=\"https:\/\/www.youtube.com\/watch?v=vmNem6wxfSQ\"><\/kinsta-video>\n","protected":false},"excerpt":{"rendered":"<p>Som webudvikler kan du ikke undg\u00e5 at st\u00f8de p\u00e5 fejl, n\u00e5r du arbejder med JavaScript. Kodningsfejl forhindrer applikationen i at g\u00f8re det, der forventes. For at &#8230;<\/p>\n","protected":false},"author":240,"featured_media":50011,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_kinsta_gated_content":false,"_kinsta_gated_content_redirect":"","footnotes":""},"tags":[],"topic":[704],"class_list":["post-50010","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","topic-javascript-fejl"],"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\u00e5dan l\u00f8ser du &quot;uncaught typeerror: cannot set property&quot; Fejl i JavaScript - Kinsta\u00ae<\/title>\n<meta name=\"description\" content=\"Meddelelsen &quot;uncaught typeerror: cannot set propert&quot; i JavaScript kan have flere \u00e5rsager. 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