Public snipts » javascript

• ∞ center div both horizontal and vertical

  .className{
  	margin:0 auto;
  	width:200px;
  	height:200px;
  }
  
  .className{
  	width:300px;
  	height:200px;
  	position:absolute;
  	left:50%;
  	top:50%;
  	margin:-100px 0 0 -150px;
  }
  
  $(window).resize(function(){
  
  	$('.className').css({
  		position:'absolute',
  		left: ($(document).width() - $('.className').outerWidth())/2,
  		top: ($(document).height() - $('.className').outerHeight())/2
  	});
  
  });
  
  // To initially run the function:
  $(window).resize();

  text

  1

  center div both horizontal and vertical

  .className{
  	margin:0 auto;
  	width:200px;
  	height:200px;
  }
  
  .className{
  	width:300px;
  	height:200px;
  	position:absolute;
  	left:50%;
  	top:50%;
  	margin:-100px 0 0 -150px;
  }
  
  $(window).resize(function(){
  
  	$('.className').css({
  		position:'absolute',
  		left: ($(document).width() - $('.className').outerWidth())/2,
  		top: ($(document).height() - $('.className').outerHeight())/2
  	});
  
  });
  
  // To initially run the function:
  $(window).resize();
  

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  0 comments - tagged in 
  • css, 
  • div, 
  • horizontal, 
  • javascript, 
  • vertical
  posted by keyboardkitteh on Mar 06, 2010 at 4:38 a.m. EST

• ∞ Disallow doubleclick of form submit buttons

  // Find ALL <form> tags on your page
  $('form').submit(function(){
    // On submit disable its submit button
    $('input[type=submit]', this).attr('disabled', 'disabled');
  });

  js

  1

  Disallow doubleclick of form submit buttons

  // Find ALL <form> tags on your page
  $('form').submit(function(){
    // On submit disable its submit button
    $('input[type=submit]', this).attr('disabled', 'disabled');
  });
  

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  0 comments - tagged in 
  • disable, 
  • form, 
  • javascript, 
  • submit
  posted by bwsewell on Mar 05, 2010 at 12:09 p.m. EST

• ∞ Button to launch X-ray popup

  <a href="#" style="background-color: rgba(23,110,107,.3); color: #000; text-decoration: none;" onClick="myRef = window.open('http://poynterextra.org/xray/roy_AppForThat','xraywindow','left=20,top=20,width=900,height=500,toolbar=0,scrollbars=1');myRef.focus()">See the X-ray reading by Roy Peter Clark</a>

  html

  1

  Button to launch X-ray popup

  <a href="#" style="background-color: rgba(23,110,107,.3); color: #000; text-decoration: none;" onClick="myRef = window.open('http://poynterextra.org/xray/roy_AppForThat','xraywindow','left=20,top=20,width=900,height=500,toolbar=0,scrollbars=1');myRef.focus()">See the X-ray reading by Roy Peter Clark</a>
  

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  0 comments - tagged in 
  • html, 
  • javascript, 
  • poynter
  posted by gotoplanb on Mar 03, 2010 at 12:02 p.m. EST

• ∞ 2

  action: $('form#newHotnessForm').attr('action'),

  js

  1

  2

  action: $('form#newHotnessForm').attr('action'),
  

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  0 comments - tagged in 
  • javascript
  posted by mkelly12 on Feb 26, 2010 at 6:47 p.m. EST

• ∞ 1

  new AjaxUpload('imageUpload', {
  

  js

  1

  1

  new AjaxUpload('imageUpload', {
  

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  0 comments - tagged in 
  • javascript
  posted by mkelly12 on Feb 26, 2010 at 6:14 p.m. EST

• ∞ The trim function that should have always been

  /*	Trim
  
  	Adds/enables the trim function to strings.
  	
  	This makes sure the user's browser isn't already using the
  	ES 5 (next version of JS) trim function.
  */
  if (typeof String.prototype.trim !== 'function') {
  	String.prototype.trim = function () {
  		return this.replace(/^\s*(\S*(\s+\S+)*)\s*$/,"$1");
  	}
  }

  js

  1

  The trim function that should have always been

  /*	Trim
  
  	Adds/enables the trim function to strings.
  	
  	This makes sure the user's browser isn't already using the
  	ES 5 (next version of JS) trim function.
  */
  if (typeof String.prototype.trim !== 'function') {
  	String.prototype.trim = function () {
  		return this.replace(/^\s*(\S*(\s+\S+)*)\s*$/,"$1");
  	}
  }
  

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  0 comments - tagged in 
  • javascript, 
  • trim
  posted by scoot2006 on Feb 24, 2010 at 10:34 a.m. EST

• ∞ See the comments in the code...

  /*	Supplant
  
  Replaces items in a string denoted with curly braces with their associated values in an object.
  
  Example:
  
  Say you have a markup template like:
  
  	var template =	'<table border="{border}">' +
  						'<thead>' +
  							'<tr>' +
  								'<th>First</th>' +
  								'<th>Last</th>' +
  							'</tr>' +
  						'</thead>' +
  						'<tbody>' +
  							'<tr>' +
  								'<td>{first}</td>' +
  								'<td>{last}</td>' +
  							'</tr>' +
  						'</tbody>' +
  					'</table>';
  					
  And an object like this:
  					
  	var data = {
  		first: "John",
  		last: "Smith",
  		border: 1
  	};
  
  This function will replace all instances of "{border}" with 1,
  all instances of "{first}" with John, and all instances of
  "{last}" with Smith.
  
  Example call:
  
  	mydiv.innerHTML = template.supplant(data);
  
  */	
  if (typeof String.prototype.supplant !== 'function') {
  	String.prototype.supplant = function (o) {
  		return this.replace(/{([^{}]*)}/g,
  			function (a, b) {
  				var r = o[b];
  				return typeof r === 'string' ? r : a;
  			});
  	}
  }

  js

  1

  See the comments in the code...

  /*	Supplant
  
  Replaces items in a string denoted with curly braces with their associated values in an object.
  
  Example:
  
  Say you have a markup template like:
  
  	var template =	'<table border="{border}">' +
  						'<thead>' +
  							'<tr>' +
  								'<th>First</th>' +
  								'<th>Last</th>' +
  							'</tr>' +
  						'</thead>' +
  						'<tbody>' +
  							'<tr>' +
  								'<td>{first}</td>' +
  								'<td>{last}</td>' +
  							'</tr>' +
  						'</tbody>' +
  					'</table>';
  					
  And an object like this:
  					
  	var data = {
  		first: "John",
  		last: "Smith",
  		border: 1
  	};
  
  This function will replace all instances of "{border}" with 1,
  all instances of "{first}" with John, and all instances of
  "{last}" with Smith.
  
  Example call:
  
  	mydiv.innerHTML = template.supplant(data);
  
  */	
  if (typeof String.prototype.supplant !== 'function') {
  	String.prototype.supplant = function (o) {
  		return this.replace(/{([^{}]*)}/g,
  			function (a, b) {
  				var r = o[b];
  				return typeof r === 'string' ? r : a;
  			});
  	}
  }
  

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  0 comments - tagged in 
  • javascript, 
  • supplant
  posted by scoot2006 on Feb 24, 2010 at 10:33 a.m. EST

• ∞ Checks to see if an object is an array.

  /*	Array.isArray
  	
  	Checks to see if the passed object is an array since typeof(array) === 'object'
  	
  	Makes sure the user's browser isn't using the ES 5 isArray function.
  */
  if (typeof Array.isArray !== 'function') {
  	Array.isArray = function (value) {
  		return Array.prototype.toString.apply(value) === '[object Array]';
  	}
  }

  js

  1

  Checks to see if an object is an array.

  /*	Array.isArray
  	
  	Checks to see if the passed object is an array since typeof(array) === 'object'
  	
  	Makes sure the user's browser isn't using the ES 5 isArray function.
  */
  if (typeof Array.isArray !== 'function') {
  	Array.isArray = function (value) {
  		return Array.prototype.toString.apply(value) === '[object Array]';
  	}
  }
  

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  0 comments - tagged in 
  • array, 
  • javascript
  posted by scoot2006 on Feb 24, 2010 at 10:32 a.m. EST

• ∞ Some JS for Flot with some Rails to flavor

  /* Generate Graph of Weights for <%= @user.name %> as provided in @DataSet */
  var underweight = $("#bmi_underweight").css("background-color");
  var normalweight =  $("#bmi_normalweight").css("background-color");
  var overweight =  $("#bmi_overweight").css("background-color");
  var obese =  $("#bmi_obese").css("background-color");
  
  
  $.plot($("#weight_chart"),[{label: "Weight", data:<%= @DataSet.to_json %>}],
      {
        series: {
          color: "#000000",
          lines: {
            show: true,
            fill: false,
            lineWidth: 5
            },
          shadowSize: 10,
          points: { show: true }
        },
        grid: {
          hoverable: true, clickable: true ,
          backgroundColor: { colors: ["#fff", "#eee"] },
          markings: [
            { yaxis: { <%= @bmi_ranges["underweight"] %>}, color:underweight },
            { yaxis: {  <%= @bmi_ranges["normal"] %> }, color:normalweight },
            { yaxis: {  <%= @bmi_ranges["overweight"] %> }, color:overweight },
            { yaxis: {  <%= @bmi_ranges["obese"] %> }, color:obese }
            ]
        },
        xaxis: {
          mode: "time",
          timeformat: "%b %d, %y"
        }
    });
  

  js

  1

  Some JS for Flot with some Rails to flavor

  /* Generate Graph of Weights for <%= @user.name %> as provided in @DataSet */
  var underweight = $("#bmi_underweight").css("background-color");
  var normalweight =  $("#bmi_normalweight").css("background-color");
  var overweight =  $("#bmi_overweight").css("background-color");
  var obese =  $("#bmi_obese").css("background-color");
  
  
  $.plot($("#weight_chart"),[{label: "Weight", data:<%= @DataSet.to_json %>}],
      {
        series: {
          color: "#000000",
          lines: {
            show: true,
            fill: false,
            lineWidth: 5
            },
          shadowSize: 10,
          points: { show: true }
        },
        grid: {
          hoverable: true, clickable: true ,
          backgroundColor: { colors: ["#fff", "#eee"] },
          markings: [
            { yaxis: { <%= @bmi_ranges["underweight"] %>}, color:underweight },
            { yaxis: {  <%= @bmi_ranges["normal"] %> }, color:normalweight },
            { yaxis: {  <%= @bmi_ranges["overweight"] %> }, color:overweight },
            { yaxis: {  <%= @bmi_ranges["obese"] %> }, color:obese }
            ]
        },
        xaxis: {
          mode: "time",
          timeformat: "%b %d, %y"
        }
    });
  

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  0 comments - tagged in 
  • flot, 
  • javascript, 
  • jquery
  posted by lear64 on Feb 23, 2010 at 11:00 a.m. EST

• ∞ submit a form when a hyperlink or image is clicked

  // Sample code 1: pure PHP and javascript
  <form name="myform" action="handle-data.php">
  Search: <input type='text' name='query' />
  <a href="javascript: submitform()">Search</a>
  </form>
  <script type="text/javascript">
  function submitform()
  {
    document.myform.submit();
  }
  </script> 
  
  //Sample code 2: symfony and jQueryHelper
  // form to submit
  <form action="<?php echo url_for('semester/batchDelete') ?>" name="batchform" method="post">
  </form>
  //define a method to submit form in javascript
  <?php echo javascript_tag("
    function submitBatchForm(){
      document.batchform.submit();
    }
  ") ?>
  <?php echo jq_link_to_function('delete selection', 'submitBatchForm()') ?>
  

  html+php

  1

  submit a form when a hyperlink or image is clicked

  // Sample code 1: pure PHP and javascript
  <form name="myform" action="handle-data.php">
  Search: <input type='text' name='query' />
  <a href="javascript: submitform()">Search</a>
  </form>
  <script type="text/javascript">
  function submitform()
  {
    document.myform.submit();
  }
  </script> 
  
  //Sample code 2: symfony and jQueryHelper
  // form to submit
  <form action="<?php echo url_for('semester/batchDelete') ?>" name="batchform" method="post">
  </form>
  //define a method to submit form in javascript
  <?php echo javascript_tag("
    function submitBatchForm(){
      document.batchform.submit();
    }
  ") ?>
  <?php echo jq_link_to_function('delete selection', 'submitBatchForm()') ?>
  

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  0 comments - tagged in 
  • form, 
  • javascript, 
  • jq_link_to_function, 
  • submit, 
  • symfony
  posted by toledot on Feb 19, 2010 at 4:13 p.m. EST

• ∞ Navigon Connect Code for Mobile Safari

  javascript:window.location='navigon://NAVIGON%7CCoordinates%7C%7C%7C%7C%7C%7C'+gApplication.getMap().getCenter().lng()+'%7C'+gApplication.getMap().getCenter().lat()

  js

  1

  Navigon Connect Code for Mobile Safari

  javascript:window.location='navigon://NAVIGON%7CCoordinates%7C%7C%7C%7C%7C%7C'+gApplication.getMap().getCenter().lng()+'%7C'+gApplication.getMap().getCenter().lat()
  

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  0 comments - tagged in 
  • iphone, 
  • javascript
  posted by binaryghost on Jan 27, 2010 at 11:30 a.m. EST

• ∞ nodelist to array usinf prototype

  NodeList.prototype.toArray = function()
  {
  	var ary = [];
  	for(var i=0, len = this.length; i < len; i++)
  	{
  		ary.push(this[i]);
  	}
  	return ary;
  };
  
  //call like this
  var elements = document.querySelectorAll('a').toArray(); 

  js

  1

  nodelist to array usinf prototype

  NodeList.prototype.toArray = function()
  {
  	var ary = [];
  	for(var i=0, len = this.length; i < len; i++)
  	{
  		ary.push(this[i]);
  	}
  	return ary;
  };
  
  //call like this
  var elements = document.querySelectorAll('a').toArray(); 
  

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  0 comments - tagged in 
  • array, 
  • javascript, 
  • nodelist
  posted by Yansky on Jan 23, 2010 at 8:03 p.m. EST

• ∞ convert nodelist to array

  [].slice.call(document.querySelectorAll('a'), 0).forEach(function(element, index, array){
    console.log(element);
  });

  js

  1

  convert nodelist to array

  [].slice.call(document.querySelectorAll('a'), 0).forEach(function(element, index, array){
    console.log(element);
  });
  

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  0 comments - tagged in 
  • javascript, 
  • nodelist
  posted by Yansky on Jan 23, 2010 at 8:01 p.m. EST

• ∞ it returns randomly "yes" or "no"

  Math.round(Math.random()) ? "yes" : "no";

  js

  1

  it returns randomly "yes" or "no"

  Math.round(Math.random()) ? "yes" : "no";
  

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  0 comments - tagged in 
  • javascript
  posted by marcell on Jan 11, 2010 at 8:03 a.m. EST

• ∞ Create Dropdown from Select (JS)

  function createDropSelect(){
  	var count = 0;
  	$('.select').each(function(){
  		var select = $(this),
  			selected = select.find("option[selected]"),
  			options = $("option", select);
  		
  		$(".attr_values").append('<dl class="dropselector '+ count +' right"></dl>');
  		$(".dropselector."+count).append('<dt><a href="#" class="call">' + selected.text() + 
  			'<span class="value">' + selected.val() + 
  			'</span></a></dt>')
  		$(".dropselector."+count).append('<dd><ul class="call"></ul></dd>')
  		
  		options.each(function(){
  			if( $(this).text() == selected.text()){
  				$(".dropselector."+count+" dd ul").append('<li class="current"><a href="#">' +
  					$(this).text() + '<span class="value">' + 
  					$(this).val() + '</span></a></li>');
  			}else{
  				$(".dropselector."+count+" dd ul").append('<li><a href="#">' + 
  					$(this).text() + '<span class="value">' + 
  					$(this).val() + '</span></a></li>');
  			}
  		});
  		count++;
  	})
  }
  createDropSelect();
  $(".dropselector dt a").click(function() {
  	$(this).parent().parent().children('dd').children('ul').toggle();
  });
  $(".dropselector dd ul li a").click(function() {
  	var text = $(this).html();
  	$(this).parents('.dropselector').children('dt').children('a').html(text);
  	$(this).parents('.dropselector').children('dd').children('ul').toggle();
  	
  	var source = $(".select");
  	source.val($(this).find("span.value").html())
  });
  $(document).bind('click', function(e) {
  	var $clicked = $(e.target);
  	if (! $clicked.parents().hasClass("dropselector"))
  		$(".dropselector dd ul").hide();
  });

  js

  1

  Create Dropdown from Select (JS)

  function createDropSelect(){
  	var count = 0;
  	$('.select').each(function(){
  		var select = $(this),
  			selected = select.find("option[selected]"),
  			options = $("option", select);
  		
  		$(".attr_values").append('<dl class="dropselector '+ count +' right"></dl>');
  		$(".dropselector."+count).append('<dt><a href="#" class="call">' + selected.text() + 
  			'<span class="value">' + selected.val() + 
  			'</span></a></dt>')
  		$(".dropselector."+count).append('<dd><ul class="call"></ul></dd>')
  		
  		options.each(function(){
  			if( $(this).text() == selected.text()){
  				$(".dropselector."+count+" dd ul").append('<li class="current"><a href="#">' +
  					$(this).text() + '<span class="value">' + 
  					$(this).val() + '</span></a></li>');
  			}else{
  				$(".dropselector."+count+" dd ul").append('<li><a href="#">' + 
  					$(this).text() + '<span class="value">' + 
  					$(this).val() + '</span></a></li>');
  			}
  		});
  		count++;
  	})
  }
  createDropSelect();
  $(".dropselector dt a").click(function() {
  	$(this).parent().parent().children('dd').children('ul').toggle();
  });
  $(".dropselector dd ul li a").click(function() {
  	var text = $(this).html();
  	$(this).parents('.dropselector').children('dt').children('a').html(text);
  	$(this).parents('.dropselector').children('dd').children('ul').toggle();
  	
  	var source = $(".select");
  	source.val($(this).find("span.value").html())
  });
  $(document).bind('click', function(e) {
  	var $clicked = $(e.target);
  	if (! $clicked.parents().hasClass("dropselector"))
  		$(".dropselector dd ul").hide();
  });
  

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  0 comments - tagged in 
  • javascript
  posted by styledev on Jan 01, 2010 at 6:16 p.m. EST

• ∞ Javascript image replacement based on class name

  <script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.3/jquery.min.js"></script>
  <script type="text/javascript">
  
   $(document).ready(function() {
    var tcells = document.getElementsByTagName("td");
    for (i=0;i<tcells.length;i++) {
     var tcell = tcells.item(i);
     if (tcell.className == "status") {
      if (tcell.innerHTML == "Open") tcell.innerHTML = '<img src="/image/open.gif" />';
       else if (tcell.innerHTML == "Closed") tcell.innerHTML = '<img src="/images/open.png" />';
     }
    }
    return false;
   });
  </script>

  js

  1

  Javascript image replacement based on class name

  <script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.3/jquery.min.js"></script>
  <script type="text/javascript">
  
   $(document).ready(function() {
    var tcells = document.getElementsByTagName("td");
    for (i=0;i<tcells.length;i++) {
     var tcell = tcells.item(i);
     if (tcell.className == "status") {
      if (tcell.innerHTML == "Open") tcell.innerHTML = '<img src="/image/open.gif" />';
       else if (tcell.innerHTML == "Closed") tcell.innerHTML = '<img src="/images/open.png" />';
     }
    }
    return false;
   });
  </script>
  

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  0 comments - tagged in 
  • image replacement, 
  • javascript
  posted by terramar on Dec 29, 2009 at 2:38 p.m. EST

• ∞ Clear Input Using Prototype, Part II

  <script src="http://ajax.googleapis.com/ajax/libs/prototype/1.6.1.0/prototype.js" type="text/javascript" charset="utf-8"></script>
  <script type="text/javascript" charset="utf-8">
  	document.observe('dom:loaded', function() {
  
  		// Get all input elements with input class;
  		var blurElements = $$('input.input');
  
  		// Create global scope for storing default values;
  		var scope = {};
  
  		// Iterate through all targeted elements;
  		for (var idx = 0, len = blurElements.length; idx < len; idx++) {
  			var el = blurElements[idx];
  			scope[el.identify()] = el.value;
  			el.observe('blur', function(event) {
  				var e = event.element();
  				var defaultValue = this[e.identify()];
  				if(e.value == '' || e.value == defaultValue) {
  					e.value = defaultValue;
  				}
  			}.bindAsEventListener(scope));
  
  			el.observe('focus', function(event) {
  				var e = event.element();
  				if (e.value == this[e.identify()]) {
  					e.clear();
  				}
  			}.bindAsEventListener(scope));
  		}
  	});
  </script>
  

  js

  1

  Clear Input Using Prototype, Part II

  <script src="http://ajax.googleapis.com/ajax/libs/prototype/1.6.1.0/prototype.js" type="text/javascript" charset="utf-8"></script>
  <script type="text/javascript" charset="utf-8">
  	document.observe('dom:loaded', function() {
  
  		// Get all input elements with input class;
  		var blurElements = $$('input.input');
  
  		// Create global scope for storing default values;
  		var scope = {};
  
  		// Iterate through all targeted elements;
  		for (var idx = 0, len = blurElements.length; idx < len; idx++) {
  			var el = blurElements[idx];
  			scope[el.identify()] = el.value;
  			el.observe('blur', function(event) {
  				var e = event.element();
  				var defaultValue = this[e.identify()];
  				if(e.value == '' || e.value == defaultValue) {
  					e.value = defaultValue;
  				}
  			}.bindAsEventListener(scope));
  
  			el.observe('focus', function(event) {
  				var e = event.element();
  				if (e.value == this[e.identify()]) {
  					e.clear();
  				}
  			}.bindAsEventListener(scope));
  		}
  	});
  </script>
  

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  0 comments - tagged in 
  • clear on click, 
  • javascript, 
  • prototype
  posted by ritcheyer on Dec 28, 2009 at 6:35 p.m. EST

• ∞ Clear Input using Prototype

  <script type="text/javascript" charset="utf-8">
  	/* -------------------------------------------------------------------------------
  	As it turns out, this way isn't as efficient as initially thought. Yes, the code
  	is small and light (not as light as jQuery, but that's another topic entirely. As
  	I understand it, the 'click' and 'blur' will always fire regardless of where you
  	click on the page. If you are concerned about how many times users click on your
  	page, I suggest looking at Part II:
  	http://snipt.net/ritcheyer/clear-input-using-prototype-part-ii
  	------------------------------------------------------------------------------ */
  
  	document.observe('click',function(event) {
  		var e = event.element();
  		var defaultValue = e.value;
  		if(e.match('input[class="input"]')) {
  
  			// -- clear input field
  			e.clear();
  
  		}
  	
  		// -- if input looses focus replace value
  		e.observe('blur', function() {
  			if(e.value == '' || e.value == defaultValue) {
  				e.value = defaultValue;
  			}
  		});
  	});
  </script>
  

  js

  1

  Clear Input using Prototype

  <script type="text/javascript" charset="utf-8">
  	/* -------------------------------------------------------------------------------
  	As it turns out, this way isn't as efficient as initially thought. Yes, the code
  	is small and light (not as light as jQuery, but that's another topic entirely. As
  	I understand it, the 'click' and 'blur' will always fire regardless of where you
  	click on the page. If you are concerned about how many times users click on your
  	page, I suggest looking at Part II:
  	http://snipt.net/ritcheyer/clear-input-using-prototype-part-ii
  	------------------------------------------------------------------------------ */
  
  	document.observe('click',function(event) {
  		var e = event.element();
  		var defaultValue = e.value;
  		if(e.match('input[class="input"]')) {
  
  			// -- clear input field
  			e.clear();
  
  		}
  	
  		// -- if input looses focus replace value
  		e.observe('blur', function() {
  			if(e.value == '' || e.value == defaultValue) {
  				e.value = defaultValue;
  			}
  		});
  	});
  </script>
  

  copy | embed

  0 comments - tagged in 
  • clear on click, 
  • javascript, 
  • prototype
  posted by ritcheyer on Dec 28, 2009 at 6:04 p.m. EST

• ∞ Replacement to target="_blank"

  $("a[@rel~='external']").click( function() {
      window.open( $(this).attr('href') );
      return false;
  });
  

  js

  1

  Replacement to target="_blank"

  $("a[@rel~='external']").click( function() {
      window.open( $(this).attr('href') );
      return false;
  });
  

  copy | embed

  0 comments - tagged in 
  • javascript, 
  • links, 
  • new window, 
  • target=, 
  • valid xhtml, 
  • _blank
  posted by twofivethreetwo on Dec 15, 2009 at 10:38 a.m. EST

• ∞ Checking if a variable was previously defined

  //This will check if variable "variable" was previously defined
  (typeof(variable) != "undefined")

  js+php

  1

  Checking if a variable was previously defined

  //This will check if variable "variable" was previously defined
  (typeof(variable) != "undefined")
  

  copy | embed

  0 comments - tagged in 
  • definition, 
  • javascript
  posted by brenes on Dec 14, 2009 at 10:22 a.m. EST

A good javascript read

Pro JavaScript Techniques

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