StackOverflow2013

Note that there are some explanatory texts on larger screens.

plurals

POchecking for undefined variable with Underscore.js
primarykey
Id
13767236
data
AcceptedAnswerId
13768173
AnswerCount
2
ClosedDate
CommentCount
0
CommunityOwnedDate
CreationDate
2012-12-07T16:38:45.587
FavoriteCount
1
LastActivityDate
2012-12-07T19:25:02.727
LastEditDate
2012-12-07T19:25:02.727
LastEditorUserId
903544
OwnerUserId
903544
ParentId
0
PostTypeId
1
Score
2
ViewCount
4884
LastEditorDisplayName
text
Body
I'm having a problem with Underscore.js templates and Internet Explorer. Here's part of the template which is causing trouble: <pre><code> <% if ( typeof description !== 'undefined' ) { %> <%- description %> <% } else { %> No description <% } %> </code></pre> When the variable <code>description</code> is undefined (which means I'm not supplying it to the template at all, the variable does not exist), this works just fine in Safari, Firefox, Chrome. Internet Explorer however, doesn't work correctly. Instead of showing <code>No description</code> IE8 and IE9 show <code>[object HTMLMetaElement]</code>, and IE7 shows <code>[object]</code>. Checking the result of <code>typeof description</code> returns <code>undefined</code> in Safari, Firefox, Chrome, but apparently Internet Explorer returns <code>object</code> instead. I already tried Underscore.js's <code>_.isUndefined(value)</code> function, but that one doesn't work when the variable does not exist. <strike>Does anyone know a workaround for this problem? (note that I am unable to supply the variable with no value - it either exists, or it doesn't)</strike> Update I found a workaround in one of the Underscore.js Github issues <a href="https://github.com/documentcloud/underscore/issues/237#issuecomment-1781951" rel="nofollow">https://github.com/documentcloud/underscore/issues/237#issuecomment-1781951</a> Can someone explain why IE behaves differently, and why the workaround actually works? Update 2 @John-DavidDalton has provided another, better workaround in the comments below (linking directly to it doesn't seem to work)
Tags
<javascript><undefined><underscore.js>
Title
checking for undefined variable with Underscore.js
singulars
PostAcceptedAnswerId
1. PO
 singulars
 PostTypePostTypeId
 PTAnswer
PostParentId
1. This table or related slice is empty.
PostTypePostTypeId
1. PTQuestion
UserLastEditorUserId
1. USRené
UserOwnerUserId
1. USRené
plurals
PostLinksPostIdRelatedPostId
1. This table or related slice is empty.
PostLinksRelatedPostIdPostId
1. PL
 singulars
 LinkTypeLinkTypeId
 LTLinked
2. PL
 singulars
 LinkTypeLinkTypeId
 LTDuplicate
PostsAcceptedAnswerId
1. This table or related slice is empty.
PostsParentIdCreationDate
1. PO
 singulars
 PostTypePostTypeId
 PTAnswer
2. PO
 singulars
 PostTypePostTypeId
 PTAnswer
VotesPostIdCreationDate
1. VO
 singulars
 PostPostId
 POchecking for undefined variable with Underscore.js
 UserUserId
 This table or related slice is empty.
 VoteTypeVoteTypeId
 VTUpMod
2. VO
 singulars
 PostPostId
 POchecking for undefined variable with Underscore.js
 UserUserId
 UScanadadry
 VoteTypeVoteTypeId
 VTFavorite
CommentsPostId
1. This table or related slice is empty.

Querying!

Guidance

A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.