{"id":48304,"date":"2023-01-02T12:28:34","date_gmt":"2023-01-02T12:28:34","guid":{"rendered":"https:\/\/kinqsta.com\/se\/?p=48304&post_type=knowledgebase&preview_id=48304"},"modified":"2025-10-01T20:01:45","modified_gmt":"2025-10-01T20:01:45","slug":"uncaught-typeerror-cannot-read-property","status":"publish","type":"post","link":"https:\/\/kinqsta.com\/se\/blog\/uncaught-typeerror-cannot-read-property\/","title":{"rendered":"S\u00e5 h\u00e4r \u00e5tg\u00e4rdar du felet ”uncaught typeerror: cannot read property” i JavaScript"},"content":{"rendered":"

Felmeddelanden \u00e4r en central del i l\u00e4randet och anv\u00e4ndandet av alla programmeringsspr\u00e5k<\/a>. De brukar hj\u00e4lpa dig att f\u00f6rst\u00e5 vad som har g\u00e5tt fel n\u00e5gonstans i din kod.<\/p>\n

Medan vissa felmeddelanden \u00e4r enkla och l\u00e4tta att f\u00f6rst\u00e5 s\u00e5 kan andra vara lite f\u00f6rvirrande n\u00e4r du ser dem.<\/p>\n

I den h\u00e4r guiden s\u00e5 ska vi tala om ett av de vanligaste JavaScript-felen – ”uncaught typeerror: cannot read property”.<\/p>\n

I slutet av den h\u00e4r handledningen s\u00e5 b\u00f6r du f\u00f6rst\u00e5 vad ”uncaught typeerror: cannot read property” betyder, de vanligaste orsakerna och hur man \u00e5tg\u00e4rdar dem.

<\/div><\/kinsta-auto-toc><\/p>\n

Vad betyder ”uncaught typeerror: cannot read property” i JavaScript?<\/h2>\n

Felet ”uncaught typeerror: cannot read property” uppst\u00e5r fr\u00e4mst n\u00e4r du f\u00f6rs\u00f6ker anv\u00e4nda eller f\u00e5 tillg\u00e5ng till en undefined<\/code>-variabel. Det h\u00e4r felet kan uppst\u00e5 n\u00e4r du anv\u00e4nder vanilla JavaScript eller n\u00e5got Javascript-ramverk<\/a>.<\/p>\n

Du kan enkelt uppt\u00e4cka fel n\u00e4r du kodar genom att anv\u00e4nda olika utvecklarverktyg som Chrome dev tools och Kinsta\u2019s enklicks iscens\u00e4ttningsverktyg<\/a> f\u00f6r att f\u00e5nga upp fel, testa din kod med mera.<\/p>\n

S\u00e5 h\u00e4r \u00e5tg\u00e4rdar du felet ”uncaught typeerror: cannot read property” i JavaScript<\/h2>\n

I de f\u00f6ljande avsnitten s\u00e5 lyfter vi fram n\u00e5gra av orsakerna till felet ”uncaught typeerror: cannot read property” och visar hur man \u00e5tg\u00e4rdar dem med hj\u00e4lp av kodexempel.<\/p>\n

\u00c5tkomst till en objektegenskap med ett odefinierat v\u00e4rde<\/h3>\n

I det h\u00e4r avsnittet s\u00e5 diskuterar vi en av de m\u00f6jliga orsakerna till felet ”uncaught typeerror: cannot read property” i JavaScript<\/a>. Detta har att g\u00f6ra med \u00e5tkomst till en objektegenskap som \u00e4nnu inte \u00e4r definierad.<\/p>\n

H\u00e4r \u00e4r ett exempel:<\/p>\n

let person;<\/code><\/pre>\n
I koden ovan s\u00e5 har vi skapat en variabel som heter person<\/code>. Avsikten \u00e4r att g\u00f6ra denna variabel till ett objekt med egenskaper som name<\/code>, age<\/code>, hobby<\/code>.<\/p>\n
Om du gl\u00f6mmer att skapa dessa egenskaper s\u00e5 f\u00e5r du ett felmeddelande <\/a>n\u00e4r du f\u00f6rs\u00f6ker komma \u00e5t dem. Det vill s\u00e4ga:<\/p>\n
let person;\nconsole.log(person.name);\n\/\/ Uncaught TypeError: Cannot read properties of undefined (reading 'name')<\/code><\/pre>\n
Som det framg\u00e5r ovan s\u00e5 f\u00f6rs\u00f6kte vi komma \u00e5t egenskapen name<\/code>, som inte finns. Som ett resultat s\u00e5 fick vi felmeddelandet: Uncaught TypeError: Cannot read properties of undefined (reading ’name’).<\/p>\n
Detta kan h\u00e4nda vem som helst eftersom du kanske gl\u00f6mmer att skapa\/l\u00e4gga till egenskaper till ditt objekt.<\/p>\n
L\u00e5t oss forts\u00e4tta och l\u00e4gga till n\u00e5gra egenskaper till objektet f\u00f6r att \u00e5tg\u00e4rda felet:<\/p>\n
let person = {\n  name: \"John\",\n  age: 200,\n  hobby: \"coding\"\n}\nconsole.log(person.name);\n\/\/ John<\/code><\/pre>\n
I koden ovan s\u00e5 har vi lagt till egenskapen name<\/code> s\u00e5 n\u00e4r du f\u00f6rs\u00f6ker komma \u00e5t den f\u00e5r du tillbaka v\u00e4rdet ”John”.<\/p>\n
\u00c5tkomst till ett element som inte finns i en array<\/h3>\n
Precis som vi s\u00e5g i det sista avsnittet med objekt s\u00e5 m\u00f6ter du \u00e4ven felet ”uncaught typeerror: cannot read property” om du f\u00f6rs\u00f6ker komma \u00e5t ett element i en array som \u00e4nnu inte har initialiserats.<\/p>\n
H\u00e4r \u00e4r ett exempel:<\/p>\n
let arr;\nconsole.log(arr[0]);\n\/\/ Uncaught TypeError: Cannot read properties of undefined (reading '0')<\/code><\/pre>\n
I exemplet ovan s\u00e5 f\u00f6rs\u00f6kte vi komma \u00e5t det f\u00f6rsta elementet i en array som heter arr<\/code>.<\/p>\n
Arrayen har deklarerats men inte initialiserats – detta betyder att inget element har tilldelats den \u00e4nnu.<\/p>\n
F\u00f6r att \u00e5tg\u00e4rda detta s\u00e5 l\u00e4gger vi till element till arrayen innan vi f\u00e5r tillg\u00e5ng till dem. Det vill s\u00e4ga:<\/p>\n
let arr = [2,4,6,8]\nconsole.log(arr[0]);\n\/\/ 2<\/code><\/pre>\n
\u00c5tkomst till ett DOM-element som inte finns<\/h3>\n
N\u00e4r du arbetar med Document Object Model (DOM) i JavaScript s\u00e5 kan du st\u00f6ta p\u00e5 ”uncaught typeerror: cannot read property”.<\/p>\n
Detta kan h\u00e4nda av olika anledningar. Det kan exempelvis bero p\u00e5 stavfel n\u00e4r du h\u00e4nvisar till DOM-elementet, \u00e5tkomst till ett element som inte finns eller \u00e5tkomst till ett element innan DOM har laddats (vi kommer att tala om detta i n\u00e4sta avsnitt).<\/p>\n
I det h\u00e4r avsnittet s\u00e5 kommer du att se ett exempel som kastar felet ”uncaught typeerror: cannot read property” f\u00f6r \u00e5tkomst till ett obefintligt DOM-element.<\/p>\n
H\u00e4r \u00e4r HTML-koden:<\/p>\n
<!DOCTYPE html>\n<html>\n  <head>\n    <title>Error Tutorial<\/title>\n  <\/head>\n  <body>\n    <h1 id=\"content\">Hello World!<\/h1>\n    <script src=\"app.js\"><\/script>\n  <\/body>\n<\/html><\/code><\/pre>\n
I koden ovan s\u00e5 har vi skapat ett grundl\u00e4ggande HTML-dokument med ett h1<\/code>-element med ID ”content”.<\/p>\n
H\u00e4r \u00e4r JavaScript-koden:<\/p>\n
let content = document.getElementById(\"constent\");\nconsole.log(content.textContent);\n\/\/ Uncaught TypeError: Cannot read properties of null (reading 'textContent');<\/code><\/pre>\n
Koden ovan ger upphov till felet ”uncaught typeerror: cannot read property” trots att det ser ut som att vi gjorde allting r\u00e4tt.<\/p>\n
Det \u00e4r ganska l\u00e4tt att missa vad som orsakar detta fel. Det beror p\u00e5 att vi stavade ”constent” i st\u00e4llet f\u00f6r ”content” n\u00e4r vi h\u00e4nvisade till ID f\u00f6r h1<\/code>-elementet.<\/p>\n
Det vill s\u00e4ga document.getElementById(\"constent\");<\/code> i st\u00e4llet f\u00f6r document.getElementById(\"content\");<\/code>.<\/p>\n
Samma fel kommer att uppst\u00e5 om du f\u00f6rs\u00f6ker att referera till ett ID eller ett klassnamn som \u00e4nnu inte har skapats i DOM.<\/p>\n
F\u00f6r att \u00e5tg\u00e4rda detta s\u00e5 kan du helt enkelt kontrollera om det finns stavfel eller se till att det element som refereras faktiskt finns i DOM.<\/p>\n
Placering av skriptelementet ovanf\u00f6r andra DOM-element i kroppsdelen<\/h3>\n
Placeringen av ditt script<\/code>-element avg\u00f6r hur din JavaScript-kod exekveras i webbl\u00e4saren.<\/p>\n
Om du placerar script<\/code>-elementet ovanf\u00f6r alla andra element i HTML-dokumentets huvuddel kommer JavaScript-koden att k\u00f6ras innan DOM har laddats.<\/p>\n
Detta inneb\u00e4r att JavaScript inte kommer att ha n\u00e5gon referens till DOM-elementen eftersom den inte v\u00e4ntade p\u00e5 att de skulle laddas innan den utf\u00f6rdes.<\/p>\n
H\u00e4r \u00e4r ett exempel:<\/p>\n
<!DOCTYPE html>\n<html>\n  <head>\n    <title>Error Tutorial<\/title>\n  <\/head>\n  <body>\n    <script src=\"app.js\"><\/script>\n    <h1 id=\"content\">Hello World!<\/h1>\n  <\/body>\n<\/html><\/code><\/pre>\n
I koden ovan s\u00e5 har vi placerat script<\/code>-elementet ovanf\u00f6r h1<\/code>-elementet.<\/p>\n
H\u00e4r \u00e4r JavaScript-koden d\u00e4r vi f\u00f6rs\u00f6ker att referera till h1<\/code>-elementet med hj\u00e4lp av dess ID:<\/p>\n
let content = document.getElementById(\"content\");\nconsole.log(content.textContent);\n\/\/ Uncaught TypeError: Cannot read properties of null (reading 'textContent');<\/code><\/pre>\n
Som v\u00e4ntat s\u00e5 m\u00f6tte vi felet ”uncaught typeerror: cannot read property” eftersom JavaScript-koden innan h1<\/code>-elementet kunde registreras i DOM.<\/p>\n
F\u00f6r att l\u00f6sa det h\u00e4r problemet s\u00e5 ska du alltid placera ditt script<\/code>-element f\u00f6re den avslutande body<\/code>-taggen, det vill s\u00e4ga under alla andra DOM-element i dokumentets kropp. P\u00e5 s\u00e5 s\u00e4tt kommer skriptet att b\u00f6rja k\u00f6ras efter att varje element i DOM har laddats.<\/p>\n
<!DOCTYPE html>\n<html>\n  <head>\n    <title>Error Tutorial<\/title>\n  <\/head>\n  <body>\n    <h1 id=\"content\">Hello World!<\/h1>\n    <script src=\"app.js\"><\/script>\n  <\/body>\n<\/html><\/code><\/pre>\n
Sammanfattning<\/h2>\n
Fel \u00e4r en oundviklig del av att vara utvecklare. \u00c4ven om de kan g\u00f6ra dig frustrerad n\u00e4r du kodar s\u00e5 kan de \u00e4ven hj\u00e4lpa dig att l\u00e4ra dig mer och beh\u00e4rska det programmeringsspr\u00e5k som du anv\u00e4nder.<\/p>\n
N\u00e4r du st\u00e4lls inf\u00f6r ett fel s\u00e5 b\u00f6r du alltid f\u00f6rs\u00f6ka f\u00f6rst\u00e5 felmeddelandet eftersom det hj\u00e4lper dig att veta var du ska b\u00f6rja och vad du ska \u00e5tg\u00e4rda. Du kommer \u00e4ven att kunna \u00e5tg\u00e4rda andra fel med liknande felmeddelanden.<\/p>\n
Om du ska bygga en webbplats s\u00e5 finns det en m\u00e4ngd olika f\u00e4rdigheter att l\u00e4ra sig och det kr\u00e4vs mycket \u00f6vning f\u00f6r att anv\u00e4nda dessa f\u00e4rdigheter p\u00e5 ett effektivt s\u00e4tt. DevKinsta underl\u00e4ttar processen fr\u00e5n design, utveckling och distribuering, allt p\u00e5 din lokala maskin. DevKinsta anv\u00e4nds av \u00f6ver 25 000 utvecklare, webbdesigners och frilansare. Kolla in det kostnadsfritt<\/a> idag.<\/p>\n","protected":false},"excerpt":{"rendered":"
Felmeddelanden \u00e4r en central del i l\u00e4randet och anv\u00e4ndandet av alla programmeringsspr\u00e5k. De brukar hj\u00e4lpa dig att f\u00f6rst\u00e5 vad som har g\u00e5tt fel n\u00e5gonstans i din …<\/p>\n","protected":false},"author":240,"featured_media":48305,"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-48304","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","topic-javascript-fel"],"yoast_head":"\nS\u00e5 h\u00e4r \u00e5tg\u00e4rdar du felet "uncaught typeerror: cannot read property" i JavaScript<\/title>\n<meta name=\"description\" content=\"Det kan finnas flera orsaker till "uncaught typeerror\u201d-felet i JavaScript. 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