JavaScript - Comparison Operators Javascript Help

I'm trying to get an emerge effect using javascript.
Here is my code
Code:

var t;
var s=0;
function emerge()
{
document.getElementById('my_span').style.opacity=s;
s=s+0.1;
t=setTimeout("emerge()",250);
if (s>1)
{
clearTimeout(t);
}
}
}

Works fine, does the things right.

But if I use this code, I get error.
Code:

var t;
var s=0;
function emerge()
{
document.getElementById('my_span').style.opacity=s;
s=s+0.1;
t=setTimeout("emerge()",250);
if (s==1)
{
clearTimeout(t);
}
}
}

The only thing I changed was comparison operator.

I tried to debug by adding alert box
Code:

var t;
var s=0;
function emerge()
{
alert(document.getElementById('my_span').style.opacity);
document.getElementById('my_span').style.opacity=s;
s=s+0.1;
t=setTimeout("emerge()",250);
if (s>1)
{
alert("Opacity set to max");
clearTimeout(t);
}
}
}

For some reason, it does not enter the if block if I use "==" operator & the alert box keeps coming up with "1" in it.
But works fine if I use ">" operator, enters the block and the last value it shows is "0.9".

Can anyone explain as to why this happens?

Hello,

I try to learn JavaScript and I've just come across something that I can't work out.
I use the book of John Pollock: JavaScript, A beginner's guide, Third Edition.
So, page 360 and this piece of code:

Code:

function getname() {
var the_text=window.prompt("Enter your first and last name","");
if (the_text.indexOf(" ") == -1) {
window.alert("Put a space between your first and last name. Try again.");
getname();
}
var split_text= the_text.split(" ");
if ((split_text[0].charAt(0) != "Z") || (split_text[0].charAt(0) != "z")) {
var shorter_fn_string = split_text[0].substring(1,split_text[0].length);
new_fn_name = "Z"+shorter_fn_string;
}
else {
var shorter_fn_string = split_text[0].substring(1,split_text[0].length);
new_fn_name = "W"+shorter_fn_string;
}
if ((split_text[1].charAt(0)!= "Z") || (split_text[1].charAt(0)!= "z")) {
var shorter_ln_string= split_text[1].substring(1,split_text[1].length);
new_ln_name="Z"+shorter_ln_string;
}
else {
var shorter_ln_string= split_text[1].substring(1,split_text[1].length);
new_ln_name="W"+shorter_ln_string;
}
window.alert("Now your name is "+new_fn_name+" "+new_ln_name+"!");
}
getname();

the thing is it ain't working.
If I type in the propmpt window let's say simon simon I will get an alert of zimon zimon but if I type in zimon zimon it won't change to wimon wimon.
I suppouse it's because of != comparison operator.
If I use == instead of != and change the code the other way round inside if block then it works.

Code:

function getname() {
var the_text=window.prompt("Enter your first and last name","");
if (the_text.indexOf(" ") == -1) {
window.alert("Put a space between your first and last name. Try again.");
getname();
}
var split_text= the_text.split(" ");
if ((split_text[0].charAt(0) == "Z") || (split_text[0].charAt(0) == "z")) {
var shorter_fn_string = split_text[0].substring(1,split_text[0].length);
new_fn_name = "W"+shorter_fn_string;
}
else {
var shorter_fn_string = split_text[0].substring(1,split_text[0].length);
new_fn_name = "Z"+shorter_fn_string;
}
if ((split_text[1].charAt(0)== "Z") || (split_text[1].charAt(0)== "z")) {
var shorter_ln_string= split_text[1].substring(1,split_text[1].length);
new_ln_name="W"+shorter_ln_string;
}
else {
var shorter_ln_string= split_text[1].substring(1,split_text[1].length);
new_ln_name="Z"+shorter_ln_string;
}
window.alert("Now your name is "+new_fn_name+" "+new_ln_name+"!");
}
getname();

Why is that?



Regards,
Simon

Hi there people

I am new to Javascript and have come accross a problem where I need to check the value of a field on a form before it is submitted. It has to be either a whole number OR a particular text value...

I have added the following code before the form is submitted. However even if the value of the field is a whole number or it is the correct text string, the message box still pops up and the form fails to submit!

Code:

	if ((document.AddNewVA.HourlyRate.value!='neg') || (isNaN(document.AddNewVA.HourlyRate.value*1)))
	{
		// Not the correct text OR a whole number in the HourlyRate field...
		alert('Please enter a whole number or \"neg\" in the Hourly rate field...');
		document.AddNewVA.HourlyRate.value = "0";
		document.AddNewVA.HourlyRate.focus();
		return false;
	}

Can anyone point me in the right direction please?

Many thanks

Hello everyone, for starters, I'm NOT working with arrays...with that being said, I need your help...I created a webform in PHP that retrieves values from a mysql table and displays them with its own mysqli_fetch_array command, in that loop it generates a textbox for each record...so far so good.

The created textbox (input element) is so that the user can type in the sequential number of how to reorder the records...example

Original Order of Records

1 Alpha 2 Bravo 3 Charlie 4 Delta 5 Echo

and user needs it to be in this order

User input sequential

2 Alpha 5 Bravo 1 Charlie 4 Delta 3 Echo

the new order of the records will be saved on a temporary table in the database before insertion on the main table, kinnda like a preview for the new order, something like this:

New Order of Records

1 Charlie 2 Alpha 3 Echo 4 Delta 5 Bravo

Now what I need is a function that helps me display a message if the user duplicates a sequential unique, if they type in number 1 in 2 or more records, when I hit the button for the preview I need it to loop through all the input boxes and check their values, compare it with the other inputs and determine if there are duplicates or not....if there're no duplicates, continue with PHP code.....if there are duplicates, display an error so the user seeks for the duplicate and change it (inputs left in blank will not be considered for the insertion in the preview table)

I already have this:

Code:

function checkall() {
	const t='texto';
	var contar=<?php echo $contar; ?>;
    var text = ""
    var conta = 1;
	var contas= conta+1;
	text = t+conta;
	texto = t+contas;
	//var curElement = document.activeElement.value;
	var cv=document.forms['OrderPreview'][text].value;
	//var cv=document.forms['OrderPreview'][curElement].value;
	do {
		//var cv=document.forms['OrderPreview'][text].value;
		if (document.forms['OrderPreview'][texto].value=="")
		{
			return;
		}
		if (cv==document.forms['OrderPreview'][texto].value)
		{
			alert("Something Bad"); 
		}
		conta++;
		contas++;
        text = t+conta;
		texto = t+contas;
    }
    while (conta<=contar)
}

Btw, the document.activeElement part of the code displays me "undefined" in the alert message, I still don't have a clue why, could you guide me with this please? I can't do but compare the 1st input with the rest of the fields, OR compare one field to the inmediate next field....it's driving me nuts

Any help will be truly appreciated, thanks in advance

I have no idea why my code wont output the corresponding sign. I also have to include a corresponding image with the output and I have NO idea where to even start with that. Heres my code:
Code:

<html>
<head>
	<script type="text/javascript">
		function signs()
		{
			var month;
			var date;
			var sign;
			
			month=document.zodiac.selMonth.value;
			date=document.zodiac.selDate.value;
			sign{
		
		if (month == 1 && date>=20 || month ==2 && date<=18)
		{value = "You're an Aquarius";}
		if (month == 2 && date >=19 || month ==3 && date<=20) {value ="pisces";}
		if (month == 3 && date >=21 || month == 4 && date <=19){value= "Aries";}
		if (month == 4 && date >= 20 || month == 5 && date <=20) {value= "taurus";}
		if (month == 5 && date >=21 || month == 6 && date <=21) {value="gemini";}
		if (month ==6 && date >=22 || month == 7 && date <=22) {value="cancer";}
		if (month == 7 && date >=23 || month == 8 && date <=22) {value="leo";}
		if (month == 8 && date >= 23 || month == 9 && date <=22) {value="virgo";}
		if (month == 9 && date >=23 || month == 10 && date <=22) {value="libra";}
		if (month == 10 && date >=23 || month ==11 && date <=21) {value="scorpio";}
		if (month == 11 && date >=22 || month == 12 && date <=21) {value="sagittarius";}
		if (month == 12 && date >=22 || month == 1 && date <=19) {value= "capricorn";}
	</script>
	</head>
	<body>	
	
	<form name="zodiacsigns">
		<select name"month">
			<option value="0">Select the month you were born in</option>
			<option value="1">january</option>
			<option value="2">february</option>
			<option value="3">march</option>
			<option value="4">april</option>
			<option value="5">may</option>
			<option value="6">june</option>
			<option value="7">july</option>
			<option value="8">august</option>
			<option value="9">september</option>
			<option value="10">october</option>
			<option value="11">november</option>
			<option value="12">december</option>
		</select>
<br>
		<select name"date">
			<option value="0">select the date</option>
			<option value="1">1</option>
			<option value="2">2</option>
			<option value="3">3</option>
			<option value="4">4</option>
			<option value="5">5</option>
			<option value="6">6</option>
			<option value="7">7</option>
			<option value="8">8</option>
			<option value="9">9</option>
			<option value="10">10</option>
			<option value="11">11</option>
			<option value="12">12</option>
			<option value="13">13</option>
			<option value="14">14</option>
			<option value="15">15</option>
			<option value="16">16</option>
			<option value="17">17</option>
			<option value="18">18</option>
			<option value="19">19</option>
			<option value="20">20</option>
			<option value="21">21</option>
			<option value="22">22</option>
			<option value="23">23</option>
			<option value="24">24</option>
			<option value="25">25</option>
			<option value="26">26</option>
			<option value="27">27</option>
			<option value="28">28</option>
			<option value="29">29</option>
			<option value="30">30</option>
			<option value="31">31</option>
		</select>
		
<br>
<input type="button" value="click here to find out your zodiac sign" onClick="signs()">
<br>your sign is: <input type="text" name="zodiacsign" size="12" value="">
</form>
</body>
</html>

Any help would be greatly appreciated, thank you