JavaScript - No Empty Fields

How do i declare an empty array?

I need to iterate through a group of arrays and search for a user-chosen word every time.

The problem is i can't declare how many array elements will be needed, such as: new array = (12), because some words inside my arrays, occur more than others.

So i need to decalare an empty array with x number of possible values.

Can this be done?

What type of variable is an empty array element?

i thought it was undefined, but i noticed that they have different behavior than undefined does:

Code:

var r=Array(1);
var s=r.concat([0,"",null,undefined]);

alert (s.toSource()) //==="[, 0, "", null, (void 0)]"


typeof s[0] //==="undefined"
typeof s[4] //==="undefined"

as you can see, 0 and 4 both === undefined.
yet, they don't have the same toSource()...

why?

is this special type named anything specific?
or more importantly, can it be detected outside of an array as being distinct from undefined?

EDIT:
im thinking this would be the same type as ({}).nonProp ...

i guess the question is actually, "can you tell the difference between uninitialized and undefined"?

Is there a built in method to remove empty array elements

Hi. I have a form and if a field is blank a message pops up. This doesnt stop my php from running though and takes the user to another page.

Is there a line to keep them on that page untill all fields are filled out?

code so far is simple.

<script type="text/javascript" language="JavaScript">
function nameempty()
{
if ( document.form.subject1.value == '' )
{
alert('No name was entered!')
return false;
}
}
</script>


//then down the bottom I have a small bit that implements that code

Tearing my hair out here. I've got a table where I'm trying to append additional input and file fields when someone clicks a link. The appending works fine, but when I click submit, none of the appended values are being passed through.

I've tried it two different ways (both being appended to the "moreSwatches" table cell:

Code:

function addSwatch2()
{
	var moreSwatches = document.getElementById('moreSwatches');

	imgBox = document.createElement("input");
    //imgBox.type = 'file';
    //imgBox.name = 'swatch[]';
	imgBox.setAttribute("type","file");
	imgBox.setAttribute("name","swatch[]");
	moreSwatches.appendChild(imgBox);

	textBox = document.createElement("input");
	textBox.type = 'text';
	textBox.name = 'swatchname[]';
	moreSwatches.appendChild(textBox);

	setBR = document.createElement("br");
	moreSwatches.appendChild(setBR);
}

function addSwatch()
{
	var moreSwatches = document.getElementById('moreSwatches');
	var newDiv = document.createElement("div");

	addText = '<input type="file" name="swatch[]" style="width: 300px"> <input name="swatchname[]" size="25"><br>';
	newDiv.innerHTML = addText;

	moreSwatches.appendChild(newDiv);
}

If I hardcode a second set of inputs below the first, it works fine. Anything that is appended is getting ignored. Anyone got any ideas?

Hey folks. I currently have a PTZ camera that is taking screenshots every minute (or so) and sending a copy of that image (overwriting the previous one) to my website. Basically, the visitors to the website will be greeted with a live screenshot. The problem is if the visitor hits the website at just the right time, the screenshot won't be loaded completely while the 2nd most screenshot is being overwritten... creating an empty image load (the dreaded red X). What I am looking to do with Javascript is to be able to load a generic image in the scenario in which no image loads. Is that possible?

I tried doing something like the following and onload-ing it, but it wouldn't work. Any help would be appreciated. Thanks!

Code:

<script type="text/javascript">
		<!--		
		function replaceSrc() {      
			var images = document.getElementsByTagName('img');      
			
			for(var i = 0; i < images.length; i++) {         
				var img = images[i];          
				if(img.src.length == 0) {             
					img.src = 'images/garbage.gif';         
					}     
				} 
			}   			
			
		-->
</script>

Hi guys,

I am using jquery ui to have two connected sortable lists. The first list is available numbers, and the second is selected numbers. Everything with the jquery is working fine. The problem i am having is when i try to get the contents of the selected numbers box, it is empty, even though the sortables are or were dragged to that list.

I tried using this...
Code:

var response = $("#selected_numbers_box").val();
alert( response );

and I also tried this..
Code:

var response = $("#selected_numbers_box").html();
alert( response );

both are empty. What i am trying to do is retrieve the values of the new list "Selected numbers Box".

Any suggestions? My code was taken directly from the jquery ui tutorial.

Thanks in advance.

Hi,
I am not able to calculate the offsetwidth of the element which contains extra space in between the characters.

for ex.
if the element contains "A A" as a innerHTML value - if we calculate offsetwidth as 29 and also if the element contains "A A" value again I am getting the same offsetwidth as 29.

While calculating the offsetwidth it is not calculating the empty space.

May I know how to calculate the offsetwidth with the empty space because I need to insert the ellipsis (...) if it exceeds original width?


Code snipet
function fitStringToWidth(title,width,className) {
var span = document.createElement("span");
span.className="titleBar-Title-1";
span.style.display='inline';
span.style.visibility = 'hidden';
span.style.padding = '0px';
document.body.appendChild(span);
var result = title;
span.innerHTML = result;
alert("Offsetwidth : " + span.offsetWidth);

..........................

}


Thanks in advance.

Arthik

Hi there, I have this form that validates a few textboxes & a dropdownlist. And when it is not filled in, the border of the textboxes and dropdownlist would turn red, followed by an alert message notifying which field have not been filled in.



Else, the border will revert back to black, and the form will be submitted successfully.

Right now, I would like to prevent the user from entering blanks (like entering a space to cheat the system). How should I tweak the codes to make it work?

Javascript


Code:

function check(checkForm)   
{  
    var fields = new Array("Name","Email Address", "Domain Name");  
  
    var index = new Array(),k=0;  
    for(var i=0;i<fields.length;i++)  
    {  
        var isFilled = false;  
        var c = document.getElementsByName(fields[i]);  
        for(var j = 0; j < c.length; j++)  
        if(!c[j].value == "")  
        {  
            isFilled = true;  
            c[j].className = "defaultColor";              
        }  
        else  
        {  
            c[j].className ="changeToRed";  
        }    
                
        if(!isFilled)  
        {  
            index[k++] = fields[i];  
        }  
    }  
    if(k>0)  
    {  
        joinComma = index.join(', ');  
        alert('The field(s) corresponding to '+ joinComma + ' is/are not selected.');  
            return false;  
    }  
}

HTML

Code:

* Name:  
<input type="text" id="Text27" name="Name" /><br />  
<br />  
  
*Email Address:  
<input type="text" id="Text28" name="Email Address" />  
@  
<select id="Select5" name="Domain Name">  
   <option></option>  
   <option>hotmail.com</option>  
   <option>yahoo.com</option>  
</select>  
  
<input id="Submit5" type="submit" value="Submit" onclick="return check(checkForm)"/>

How to get this to work?

Code:

<html>
<body>
<script type="text/javascript" src="01.js">
<h1>Welcome</h1>
<a href="#" onclick="write(); return false;">Click here</a>
<div id="info_here">
</div>
</body>
</html>

01.js
Code:

function write() {
var a=document.getElementById("info_here");
a.innerHTML=document.write("Hello <br />" + "Thanks for clicking");
}

Hi. I have a form and in the form is a checkbox use as a switch to hide and unhide a two textbox. When the other textbox is hide, the other is unhide such as the code below. When the user click the submit button on the first time and there is an error, it reloads and the id="fieldset.-in_honor" hide because it is set to hide initially but not empty. My problem is, I want to show the fieldset whichever is not empty after submit button is click and there is an error so user will not enter any more information to the other field. Is that possible? Please help. I have a hard time explaining it but hopefully you will get the idea. Thanks in advance and hope to hear from you as soon as possible.
Code:

/*toggle switch*/
<p><input type="checkbox" name="in_honor" value="" id="checkmemoriam" onclick="showHide(this.name);" />Please check to make this donation in honor of someone special.</p>

/*hide textbox but unhide when the switch is on or the checbox is check*/


    <fieldset id="fieldset-in_honor" class="fieldgroup" style="display:none">
    <legend class="hide">In Honor Of</legend>
    <p>To make this donation in honor of someone special, please complete the two fields below:</p>
    <div class="formfield" <?php echo highlight('donate_honor_name'); ?>>
      <label for="donate_honor_name">Name:</label>
       <input id="donate_honor_name" name="donate_honor_name" class="text" type="text" value="<?php safeEcho($form['donate_honor_name'])?>" />
	      <?php helper_error('donate_honor_name'); ?>
</div>
    <div class="formfield" <?php echo highlight('donate_honor_acknowledgement'); ?>>
      <label for="donate_honor_acknowledgement">Acknowledgement should be sent to:</label>
      <textarea id="donate_honor_acknowledgement" name="donate_honor_acknowledgement"><?php safeEcho($form['donate_honor_acknowledgement'])?></textarea>
          <?php helper_error('donate_honor_acknowledgement'); ?>
</div>

/*always show on first load of the page but once the checkbox is check, will need to hide and delete info entered*/

<fieldset id="fieldset-in_registration">
<label for="impact" style="font-weight:bold">B. Impact Areas</label>
            <table>
            	<tr>
                	<td style="width:380px;text-align:left"><label for="d"  id="deslist4" name="deslist4">Crime and Drug Use <a href="javascript:alert('Ensuring prevention and treatment programs and appropriate support services are available to people who are at risk for drug addiction and supporting efforts to reduce crime.');">what is this?</a></label></td>
        
        <td style="float:right">  $<input id="d" name="d" class="text" type="text" value="<?php safeEcho($form['d'])?>" style="width:90px;" onChange="CalculateTotal()" />
     <?php helper_error('d');?> </td>
                </tr>
                <tr>
                	<td style="width:380px;text-align:left"><label for="e"  id="deslist5" name="deslist5">Early Childhood Development <a href="javascript:alert('Children are healthy, loved, nurtured, safe and have access to quality childcare and early education. This includes programs that increase parenting skills, providing books to all children and providing developmental screening for 3 and 4 year olds.');">what is this?</a></label></td>
        
        <td style="float:right">  $<input id="e" name="e" class="text" type="text" value="<?php safeEcho($form['e'])?>" style="width:90px;" onChange="CalculateTotal()" />
     <?php helper_error('e');?> </td>
                </tr></table>

Code:

/*JAVASCRIPT FUNCTION*/
function showHide()
{
if (document.getElementById('checkmemoriam').checked)
	{
	if (document.getElementById('TotalC').value == "0.00")
		{
		document.getElementById('fieldset-in_honor').style.display=""; // this is for showing
		document.getElementById('fieldset-in_registration').style.display="none";
		}
		else
		{
		var answer = confirm("You entered a total gift designation of $" + document.getElementById('TotalC').value + ". At this time, gifts made \"in honor of someone special\" are not eligible for the designation option. Clicking the OK button will delete all your designation(s). Do you want to continue?")
		if (answer)
				{
				document.getElementById('TotalC').value="0.00";
				  				                                      document.getElementById('d').value="0";
  				document.getElementById('e').value="0";
							document.getElementById('fieldset-in_honor').style.display=""; // this is for hiding
				document.getElementById('fieldset-in_registration').style.display="none";

				}
				else
				{
				document.getElementById('checkmemoriam').checked=false;
				}
			}

	}
	else
	{
	if ((document.getElementById('donate_honor_name').value="") && (document.getElementById('donate_honor_acknowledgement').value=""))
		{
		document.getElementById('fieldset-in_honor').style.display="none"; // this is for hiding
		document.getElementById('fieldset-in_registration').style.display="";
		}
		else
		{
		var answer = confirm("The field you are trying to close will delete all information you entered \"in honor of someone special\" but it will allow you to designate. Clicking the OK button will show the designation list. Do you still want to continue?")
				if (answer)
				{
				document.getElementById('donate_honor_name').value = "";
				document.getElementById('donate_honor_acknowledgement').value = "";
				document.getElementById('fieldset-in_honor').style.display="none"; // this is for hiding
				document.getElementById('fieldset-in_registration').style.display="";
				}
				else
				{
				document.getElementById('checkmemoriam').checked=false;
				document.getElementById('fieldset-in_honor').style.display=""; // this is for showing
				document.getElementById('fieldset-in_registration').style.display="none";
				}
		}

	}
}

anotherVar should be -1 if there are no matches, but it doesn't seem to work PHP Code:
var string = "abadafa";
var matches = string.match(/a/gi); //doesn't work with /z/ for example

var anotherVar = matches.length || -1; 


The default operator should return the second value if the first is null or false, and according to PHP Code:
try {
    alert(matches.length);
}
catch (e){
    alert(e); //alerts null
} 


it's null.

fyi: http://helephant.com/2008/12/javascr...ault-operator/

What's going on?

Hi all, I'm new to here and JS but I have question for you! So I have this form with inputs that are considered arrays in my PHP code:

Code:

<input type="checkbox" name="1" /> <input name="i[]" type="text"> <br /> 
<input type="checkbox" name="2" /> <input name="i[]" type="text"> <br /> 
<input type="checkbox" name="3" /> <input name="i[]" type="text"> <br /> 
<input type="checkbox" name="4" /> <input name="i[]" type="text"> <br /> 
<input type="checkbox" name="5" /> <input name="i[]" type="text"> <br /> 
<input type="checkbox" name="6" /> <input name="i[]" type="text"> <br /> 
<input type="checkbox" name="7" /> <input name="i[]" type="text"> <br /> 
<input type="checkbox" name="8" /> <input name="i[]" type="text"> <br /> 
<input type="checkbox" name="9" /> <input name="i[]" type="text"> <br /> 
<input type="checkbox" name="10" /> <input name="i[]" type="text"> <br /> 
<input type="checkbox" name="11" /> <input name="i[]" type="text"> <br /> 
<input type="checkbox" name="12" /> <input name="i[]" type="text"> <br /> 
<input type="checkbox" name="13" /> <input name="i[]" type="text"> <br /> 
<input type="checkbox" name="14" /> <input name="ii[]" type="text"> <br /> 
<input type="checkbox" name="15" /> <input name="i[]" type="text"> <br /> 
<input type="checkbox" name="16" /> <input name="i[]" type="text"> <br /> 
<input type="checkbox" name="17" /> <input name="i[]" type="text"> <br /> 
<input type="checkbox" name="18" /> <input name="i[]" type="text"> <br /> 
<input type="checkbox" name="19" /> <input name="i[]" type="text"> <br /> 
<input type="checkbox" name="20" /> <input name="i[]" type="text"> <br />

I don't want to keep adding in new spots every time a user want to add a new field. I would like them to be able to press a button that will add another one of those fields and so on. I'm not sure how this can be achieved but that's why I am turning to you! Thanks!

I want to be able to add fields to a form with JavaScript, already had a thread about this in the PHP section and someone gave me some code. But that didn't seem to work

So here is some other code:

JavaScript:
Code:

var my_div = null;
var newDiv = null;

function addElement()
{
  // create a new div element
  // and give it some content
  newDiv = document.createElement("div");
  newDiv.innerHTML = "<label for=\"column\">Column Name: </label><input style=\"margin-bottom:1em;\" type=\"text\" 						name=\"column[]\" id=\"column\">";

  // add the newly created element and it's content into the DOM
  my_div = document.getElementById("org_div1");
  document.body.insertBefore(newDiv, my_div);
}

HTML:
Code:

<div class="login">
	<form name="tbCreate" method="post">
		<label for="tableName">Table Name: </label>
		<input type="text" name="tableName"><br />
	</form>
    <input type="button" name="addElement" onClick="addElement()" value="Add Column">
 </div>
<div id='org_div1'></div>

Problem is, it only works if the org_div1 div not between any other tags apart from <body></body>. How can I make it so that the div can be put between the form tags?

Hi folks.
I am new to javascript so please go easy on me if this is a silly request

Basically I have a table generated by a php script with a dynamic number of rows and columns. Here is a sample of the output from this script:
Code:

<tr>
<td style='width:60px'><a href='index.php?inc_id=30' onclick='return confirmDelete(this)'>Remove</a></td>
<td style='text-align:center'>test</td>
<td ><input type='text' name='0inccol0' value='$432.00' style='text-align:center; background-color:#cccccc'/></td>
<td ><input type='text' name='0inccol1' value='$432.00' style='text-align:center; background-color:#cccccc'/></td>
<td ><input type='text' name='0inccol2' value='$432.00' style='text-align:center; background-color:#cccccc'/></td>
<td ><input type='text' name='0inccol3' value='$432.00' style='text-align:center; background-color:#cccccc'/></td>
<td ><input type='text' name='0inccol4' value='$432.00' style='text-align:center; background-color:#cccccc'/></td>
<td ><input type='text' name='0inccol5' value='$432.00' style='text-align:center; background-color:#cccccc'/></td>
<td ><input type='text' name='0inccol6' value='$432.00' style='text-align:center; background-color:#cccccc'/></td>
<td ><input type='text' name='0inccol7' value='$432.00' style='text-align:center; background-color:#cccccc'/></td>
</tr>
<tr>
<td style='width:60px'><a href='index.php?inc_id=31' onclick='return confirmDelete(this)'>Remove</a></td>
<td style='text-align:center'>test2</td>
<td ><input type='text' name='1inccol0' value='$213.00' style='text-align:center; background-color:#cccccc'/></td>
<td ><input type='text' name='1inccol1' value='$213.00' style='text-align:center; background-color:#cccccc'/></td>
<td ><input type='text' name='1inccol2' value='$213.00' style='text-align:center; background-color:#cccccc'/></td>
<td ><input type='text' name='1inccol3' value='$213.00' style='text-align:center; background-color:#cccccc'/></td>
<td ><input type='text' name='1inccol4' value='$213.00' style='text-align:center; background-color:#cccccc'/></td>
<td ><input type='text' name='1inccol5' value='$213.00' style='text-align:center; background-color:#cccccc'/></td>
<td ><input type='text' name='1inccol6' value='$213.00' style='text-align:center; background-color:#cccccc'/></td>
<td ><input type='text' name='1inccol7' value='$213.00' style='text-align:center; background-color:#cccccc'/></td>
</tr>
<tr>
<td style='width:60px'><a href='index.php?inc_id=32' onclick='return confirmDelete(this)'>Remove</a></td>
<td style='text-align:center'>test3</td>
<td ><input type='text' name='2inccol0' value='$65.00' style='text-align:center; background-color:#cccccc'/></td>
<td ><input type='text' name='2inccol1' value='$65.00' style='text-align:center; background-color:#cccccc'/></td>
<td ><input type='text' name='2inccol2' value='$65.00' style='text-align:center; background-color:#cccccc'/></td>
<td ><input type='text' name='2inccol3' value='$65.00' style='text-align:center; background-color:#cccccc'/></td>
<td ><input type='text' name='2inccol4' value='$65.00' style='text-align:center; background-color:#cccccc'/></td>
<td ><input type='text' name='2inccol5' value='$65.00' style='text-align:center; background-color:#cccccc'/></td>
<td ><input type='text' name='2inccol6' value='$65.00' style='text-align:center; background-color:#cccccc'/></td>
<td ><input type='text' name='2inccol7' value='$65.00' style='text-align:center; background-color:#cccccc'/></td>
</tr>

What I want to do is create a row of 'totals' fields at the bottom of this table that will sum the fields in the column above.
Looking at the naming convention above, the first number is the row, the number at the end is the column so I will want to sum all of the input values with a name ending in 0 in the first 'total' field, all the input values with names ending in 1 in the next and so on. The number of rows and columns is dynamic based on the users selections prior to buiding the table.

The reason I am using input fields is that I would also like an event (onChange/onBlur?) that will update the totals fields if a user manually changes the value in one of the inputs.

Any advice on this will be appreciated!