Is Not A Constructor Javascript Error
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Questions Jobs Documentation Tags Users Badges Ask Question x Dismiss Join the Stack Overflow Community Stack Overflow is a community of 4.7 million programmers, just like you, helping each javascript uncaught typeerror is not a constructor other. Join them; it only takes a minute: Sign up Javascript “Not a Constructor” Exception while creating objects up vote 24 down vote favorite 4 I am defining an object like this: function Project(Attributes, ProjectWidth, ProjectHeight) { this.ProjectHeight = ProjectHeight; this.ProjectWidth = ProjectWidth; this.ProjectScale = this.GetProjectScale(); this.Attributes = Attributes; this.currentLayout = ''; this.CreateLayoutArray = function() {....} } I is not a constructor es6 then try to create and instance like this: var newProj = new Project(a,b,c); But this execption is thrown: Project is not a constructor What could be wrong? I googled around a lot, but still can't figure out what I am doing wrong. javascript object constructor typeerror share|improve this question edited Apr 11 '12 at 13:52 Rob W 204k32467460 asked Apr 11 '12 at 13:44 unni 1,03511017 Out of curiosity, which browser is giving that "Project is not a constructor" message? –Dagg Nabbit Apr 11 '12 at 13:54 8 As an unrelated side node, general JavaScript style guidelines recommend starting a variable identifier with an uppercase letter only if it is a constructor: "Project" is okay, but the leading capital in "ProjectHeight" suggests to me that it should also be a constructor. If you use "projectHeight" instead, your code will be more readable to others. (In fact, if other posters are right, and you've defined a Project variable elsewhere, using the leading-uppercase-for-constructors-only rule will save you from making that mi
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is a community of 4.7 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up Javascript: TypeError: … is not a constructor up vote 10 down vote favorite http://stackoverflow.com/questions/10107198/javascript-not-a-constructor-exception-while-creating-objects 2 I have a TypeError problem: function artist(name) { this.name = name; this.albums = new Array(); this.addAlbum = function(albumName) { for (var i = 0; i < this.albums.length; i++) { if (this.albums[i].name == albumName) { return this.albums[i]; } } var album = new album(albumName); this.albums.push(album); return album; } } function album(name) { this.name = name; this.songs = new Array(); this.picture = null; this.addSong = function(songName, track) { var newSong = http://stackoverflow.com/questions/15008793/javascript-typeerror-is-not-a-constructor new songName(songName, track); this.songs.push(newSong); return newSong; } } gives the following error: TypeError: album is not a constructor I can't find the problem. I read a lot of other posts, but I could not find a similar problem. Could it be that it's not allowed to create an object in another object? How I can solve this problem? javascript object constructor typeerror share|improve this question edited Aug 15 '13 at 11:58 Mark Rotteveel 36.3k84677 asked Feb 21 '13 at 17:39 user2089120 66226 add a comment| 1 Answer 1 active oldest votes up vote 29 down vote This line var album = new album(albumName); shadows the external album function. So yes, album isn't a constructor inside the function. To be more precise it's undefined at this point. To avoid this kind of problem, I'd suggest naming your "classes" starting with an uppercase : function Album(name) { More generally I'd suggest to follow the Google style guide when in doubt. share|improve this answer edited Jun 10 at 12:07 David Salamon 109110 answered Feb 21 '13 at 17:40 Denys Séguret 214k27416468 7 It's equivalent to var album; album = new album(albumName);. That should make it more obvious. –Felix Kling Feb 21 '13 at 17:41 @Felix Kling: Th
here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss the workings and policies http://stackoverflow.com/questions/24385366/javascript-oop-typeerror-not-a-constructor of this site About Us Learn more about Stack Overflow the company Business Learn more about hiring developers or posting ads with us Stack Overflow Questions Jobs Documentation Tags Users Badges http://www.codingforums.com/javascript-programming/191959-error-object-not-constructor-javascript.html Ask Question x Dismiss Join the Stack Overflow Community Stack Overflow is a community of 4.7 million programmers, just like you, helping each other. Join them; it only takes a minute: is not Sign up Javascript OOP, TypeError: not a constructor up vote 0 down vote favorite 1 I am trying to use OOP based javascript/jQuery. I want to put all my JS function inside a class, so it can be easily overridden/hooked. I tried with a simple OOP code, but its giving type error: not a constructor. Please have a look at my code is not a and guide me what is wrong in my code, and how to fix it. var myTestClass = { testAttribute : 'test', // atttribute testMethod : function(){ alert( testAttribute); } }; var my = new myTestClass(); my.testMethod(); Thanks javascript jquery oop share|improve this question edited Jan 20 at 14:35 gariepy 3,01441027 asked Jun 24 '14 at 11:23 user007 1,17253051 3 constructor - is a function, see about new operator –Grundy Jun 24 '14 at 11:26 1 Also you might this link useful phpied.com/3-ways-to-define-a-javascript-class –Tasos K. Jun 24 '14 at 11:28 1 @TasosK.: Don't use their "third way"! –Bergi Jun 24 '14 at 11:30 1 best tutorial on Javascript OOP: tobyho.com/2010/11/22/javascript-constructors-and –lordvlad Jun 24 '14 at 11:33 add a comment| 2 Answers 2 active oldest votes up vote 6 down vote accepted to view your alert: var myTestClass = { testAttribute: 'test', testMethod: function () { alert(this.testAttribute); } }; myTestClass.testMethod(); another approach: function myTClass(){ var testAttribute = 'test'; this.testMethod = function () { alert(testAttribute); }; } var obj = new myTClass(); obj.testMethod(); Lazy Inheritance example: function myTClass(){ this.testMethod = function () { alert(this
New? Today's Posts FAQ Rules Guidelines Search Advanced Search Forum :: Client side development JavaScript programming Error: Object is not a constructor javascript? If this is your first visit, be sure to check out the FAQ by clicking the link above. You may have to register before you can post: click the register link above to proceed. To start viewing messages, select the forum that you want to visit from the selection below. Enjoy an ad free experience by logging in. Not a member yet? Register. Results 1 to 2 of 2 Thread: Error: Object is not a constructor javascript? Thread Tools Show Printable Version Email this Page… Subscribe to this Thread… Rate This Thread Current Rating Excellent Good Average Bad Terrible 03-20-2010,10:59 AM #1 nil_von_9wo View Profile View Forum Posts New to the CF scene Join Date Mar 2010 Posts 5 Thanks 2 Thanked 0 Times in 0 Posts Error: Object is not a constructor javascript? I am trying to understand why I had an error, or why my solution worked. In my HTML I had: Code: Book.js said: Code: function Book(title, author) { this.title = title; this.author = author; } Book.prototype.toString = function() { return '"' + this.title + '" by '+ this.author; }; var Book = new Book ("John", "Dough"); alert (Book); // displays "John Dough" And, predictably, at this stage, the code worked. Book.js said: Code: var myBook = new Book ("JavaScript Tutorials", "Herong Yang"); However, at this point the JavaScript would crash and I'd get an error "Error: Book is not a constructor javascript." I drove myself nuts trying to figure out why the code wasn't working at this later point. Eventually, I copied another object: Code: /* * Person class */ /** * Person constructor * * @param {String} first * The person's first name * @param {String} last * The person's last name */ function Person(first, last) { this.first = first; this.last = last; } /** * Create a string representation of this object * * @return {String} A string representation of this object */ Person.prototype.toString = function() { return this.first + " " + this.last; }; /* var person = new Person ("John", "Dough"); alert (person); // displays "John Dough" */ and then used find and replace to swap {Person, first, last} with {Book, title, author}, resulting in: Code: /* * Book class */ /** * Book constructor * * @param {String} title * The Book's title * @param {String} author * The Book's author */ function Book(title, author) { this.title = t