StackOverflow2013

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plurals

PO
primarykey
Id
15994684
data
AcceptedAnswerId
0
AnswerCount
0
ClosedDate
CommentCount
0
CommunityOwnedDate
CreationDate
2013-04-14T01:12:11.777
FavoriteCount
0
LastActivityDate
2013-04-14T07:32:35.713
LastEditDate
2013-04-14T07:32:35.713
LastEditorUserId
82548
OwnerUserId
82548
ParentId
15994510
PostTypeId
2
Score
2
ViewCount
0
LastEditorDisplayName
text
Body
I'd suggest the following (explanations commented in the code itself): <pre><code>function calc() { /* finds out whether the browser uses textContent (Webkit, Opera, Mozilla...) or innerText (Microsoft) to set the text of an element/node */ var textType = Node.textContent ? 'textContent' : 'innerText', /* uses parseFloat to create numbers (where possible) from the entered value if parseFloat fails to find a number (it's empty or nonsensical) then a 0 is used instead (to prevent NaN being the output). */ num1 = parseFloat(document.getElementById('num1').value) || 0, num2 = parseFloat(document.getElementById('num2').value) || 0, // retrieves the result element result = document.getElementById('result'); // switch is used to avoid lots of 'if'/'else if' statements, // .replace() is used to remove leading, and trailing, whitespace // could use .trim() instead, but that'd need a shim for (older?) IE switch (document.getElementById('op').value.replace(/\s/g,'')){ // if the entered value is: // a '+' then we set the result element's text to the sum case '+': result[textType] = num1 + num2; break; // and so on... case '-': result[textType] = num1 - num2; break; case '*': result[textType] = num1 * num2; break; case '/': result[textType] = num1 / num2; break; // because people are going to try, give a default message if a non-math // operand is used default: result[textType] = 'Seriously? You wanted to try math with that operand? Now stop being silly.' break; } } </code></pre> <a href="http://jsfiddle.net/davidThomas/wxhU9/4/" rel="nofollow">JS Fiddle demo</a>. References: <ul> <li><a href="https://developer.mozilla.org/en-US/docs/JavaScript/Reference/Global_Objects/parseFloat" rel="nofollow"><code>parseFloat()</code></a>.</li> <li><a href="https://developer.mozilla.org/en-US/docs/JavaScript/Reference/Statements/switch" rel="nofollow"><code>switch () {...}</code></a>.</li> </ul>
Tags
Title
singulars
PostAcceptedAnswerId
1. This table or related slice is empty.
PostParentId
1. POJavascript Text Input Calculator
 singulars
 PostTypePostTypeId
 PTQuestion
PostTypePostTypeId
1. PTAnswer
UserLastEditorUserId
1. USDavid Thomas
UserOwnerUserId
1. USDavid Thomas
plurals
PostLinksPostIdRelatedPostId
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PostLinksRelatedPostIdPostId
1. This table or related slice is empty.
PostsAcceptedAnswerId
1. This table or related slice is empty.
PostsParentIdCreationDate
1. This table or related slice is empty.
VotesPostIdCreationDate
1. VO
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 PO
 UserUserId
 This table or related slice is empty.
 VoteTypeVoteTypeId
 VTUpMod
2. VO
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CommentsPostId
1. This table or related slice is empty.

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