Databases
StackOverflow2013
Postsdbo
POJavascript method to ensure that a date is valid
 

Note that there are some explanatory texts on larger screens.

plurals
  1. POJavascript method to ensure that a date is valid
    primarykey
    data
    text
    <p>I'm trying to write a method that checks whether a date is valid. It is passed in three Strings: month, day, and year, in order. Month should be from 0-11 instead of 1-12. I have tested the logic of the code in Java and it works. is_int is another method that tests if a String is composed solely of numerical characters. Unfortunately, I am running into problems which I can't figure out.</p> <pre><code>function is_int(value) { for (i = 0 ; i &lt; value.length ; i++) { if ((value.charAt(i) &lt; '0') || (value.charAt(i) &gt; '9')) return false } return true; } function isValidDate(value1:String, value2:String, value3:String) { if (!is_int(value3)) return false; if (!is_int(value2)) return false; if (!is_int(value1)) return false; var v1 = parseInt(value1) + 1; var v2 = parseInt(value2); var v3 = parseInt(value3); if (v1 &gt; 12 || v1 &lt; 1) return false; if (v2 &gt; 31 || v2 &lt; 1) return false; if (v2 == 31) if (v1 == 2 || v1 == 4 || v1 == 6 || v1 == 9 || v1 == 11) return false; if (v1 != 2) return true; if (v2 &lt; 29) return true; if (v2 == 30) return false; if (v3 % 400 == 0) return true; else if (v3 % 100 == 0) return false; else if (v3 % 4 == 0) return true; else return false; } </code></pre> <p>My first tester is something that asks for three text inputs and, if the isValidDate function returns false, displays an alert. If not, it forwards to a blank html page. However, I tried this:</p> <pre><code>function validate() { if (!isValidDate("a", "a", "a")) { alert("wrong"); return false; } } </code></pre> <p>and the alert never displayed and it forwarded every time. Strangely enough, this still happened when I removed the exclamation point in front of isValidDate. I also tried swapping the double quotation marks for single, but that didn't fix the problem either. The same thing happens with my tester for is_int. I have no idea where I'm going wrong.</p>
    singulars
    1. PO
      singulars
      1. PTAnswer
    1. This table or related slice is empty.
    1. PTQuestion
    1. This table or related slice is empty.
    1. USjoseph
    plurals
    1. PL
      singulars
      1. LTLinked
    1. PL
      singulars
      1. LTLinked
    1. This table or related slice is empty.
    1. PO
      singulars
      1. PTAnswer
    2. PO
      singulars
      1. PTAnswer
    3. PO
      singulars
      1. PTAnswer
    1. VO
      singulars
      1. POJavascript method to ensure that a date is valid
      1. This table or related slice is empty.
      1. VTUpMod
    1. COYou can use the built-in function [`isNaN`](https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/isNaN) to check whether strings are valid numbers. See http://stackoverflow.com/questions/175739/is-there-a-built-in-way-in-javascript-to-check-if-a-string-is-a-valid-number/175787#175787
      singulars
      1. POJavascript method to ensure that a date is valid
      1. USJon Gauthier
    2. COisNaN is a little different from my function. For example, isNaN("") returns false because "" is equal to 0 according to that function. I don't want "" to be a number so I used mine instead.
      singulars
      1. POJavascript method to ensure that a date is valid
      1. USjoseph
    3. COHow about `parseInt(some_string, 10) == some_string`?
      singulars
      1. POJavascript method to ensure that a date is valid
      1. USJon Gauthier
 

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.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload