Monthly Archives: March 2013

Code of the Day: Coffeescript + jQuery, enforce max length for all input elements

Enforce max length in all browsers since some browsers, IE8, don’t support maxlength for all input elements.

Coffeescript

# requires jQuery 1.6+ 
enforceMaxLength = ->
  $("[maxlength]").on "blur", ->
    $(@).val (index,val) -> 
      val.substring 0, $(@).attr("maxlength")

enforceMaxLength()

Javascript

// Generated by CoffeeScript 1.6.1
(function() {
  var enforceMaxLength;
 
  enforceMaxLength = function() {
    return $("[maxlength]").on("blur", function() {
      return $(this).val(function(index, val) {
        return val.substring(0, $(this).attr("maxlength"));
      });
    });
  };
 
  enforceMaxLength();
 
}).call(this);

Larry Battle

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Video of the day: 3d printing overview by OffBook PBS

Will 3D Printing Change the World?

Larry Battle

I love to program, and discover new tech. Check out my stackoverflow and github accounts.

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Code of the day: Javascript check if an object is empty

`isObjectEmpty()` is a function that will only return true if the passed an object that contains no keys.
This is different than jQuery.isEmptyObject() because the passed argument MUST be an object.

/**
* Check to see if an object has any keys.
* @param {Object} obj
* @return {Boolean}
* @author Larry Battle <bateru.com/news>
* @license WTFPL
**/
var isObjectEmpty = function( obj ) {
	var name;
	for ( name in obj ) {
		return false;
	}
	return obj != null && typeof obj === "object";
};

Larry Battle

I love to program, and discover new tech. Check out my stackoverflow and github accounts.

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Code of the Day: Javascript Auto-complete date format MMDDYYYY

/**
* This function helps to autocomplete the date format MMDDYYY
* Converts M to 0M and MMD to MM0D. Ex. `1/` to `01/`, `01/1/` to `01/01/`
* Adds slash for MM and MMDD Ex. `01` to `01/`, `01/02` to `01/02/`
* Converts YY to YYYY. Ex. `01/01/01` to `01/01/2001`
*
* @param {String} str
* @return {String}
*/
var autocompleteMMDDYYYYDateFormat = function (str) {
        str = str.trim();
        var matches, year,
                looksLike_MM_slash_DD = /^(\d\d\/)?\d\d$/,
                looksLike_MM_slash_D_slash = /^(\d\d\/)?(\d\/)$/,
                looksLike_MM_slash_DD_slash_DD = /^(\d\d\/\d\d\/)(\d\d)$/;
 
        if( looksLike_MM_slash_DD.test(str) ){
                str += "/";
        }else if( looksLike_MM_slash_D_slash.test(str) ){
                str = str.replace( looksLike_MM_slash_D_slash, "$10$2");
        }else if( looksLike_MM_slash_DD_slash_DD.test(str) ){
                matches = str.match( looksLike_MM_slash_DD_slash_DD );
                year = Number( matches[2] ) < 20 ? "20" : "19";
                str = String( matches[1] ) + year + String(matches[2]);
        }
        return str;
};

Demo

Larry Battle

I love to program, and discover new tech. Check out my stackoverflow and github accounts.

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