JavaScript - Can Someone Please Help Explain This Javascript Function In Your Own Words?

I made a mouseover event of a caption on a picture, when I hover the opacity of the background color of the hover and the text goes down. What I want is that when I hover over the image which the caption is floating on, the onmouseover event gets activite. For an imaginary example:
Code:

function unhighlight(x) {
x.style.backgroundColor="transparent"
}

Function ActivationFuction()
{
activate.function="unhighlight"
}

thanks

How can I call a PHP Function inside a Javascript Function? This is what I have so far, but I don't think I'm doing it the right way.
Any suggestions?

PHP Code:
<?php
function phpQuery(){

     $query = mysql_query("INSERT INTO mytable VALUES('','name','email')");

}
?>
<script type="text/javascript">
function delayQueries()
{
  timeoutID = window.setTimeout(doQueries, 2000);
}

function doQueries()
{
  var runQuery = "<?php phpQuery(); ?>";    
}
</script>

Hi everyone,

I am pretty new at javascript OOP.

I have a javascript file that has plenty of javascript functions, variables, arrays, etc.

I need to convert this into an object.

Here is an example:

Code:

var myvar1 = '';
var myvar2 = new array();
var myvar3 = new array();
var myvar4;
var myvar5 = 60;
var myvar6 = '';

function myfunc1(){
 myvar1 = 'hello';
 return myvar1;
}

function myfunc2(somenum=0){
 myvar5 = somenum;
 //calling myfunc1() from within this function.
 //do something in here
}

function myfunc3(){
 //calling myfunc1() from within this function.
 for(i=0;i<somelength;i++){
   myvar2 = myvar3[i]; (something to put into the array)
 }
}

1. I need to create an object and put ALL the varibles (myvar1 - myvar5) in that object.
2. Then the first two functions "myfunc1 and myfunc2" inside the same object.
2. And the function myfunc3 needs to sit OUTSIDE my object as a regular javascript function. It calls on myfunc1 (which is inside the object) and also inserts data into myvar2 (which is classified inside the object) and myvar3 (which is classified inside the object as well).

This is what i came up with, but it's not going well:
Code:

var myobj1 = function(){
 this.myvar1 = '';
 this.myvar2 = new array();
 this.myvar3 = new array();
 this.myvar4;
 this.myvar5 = 60;
 this.myvar6 = '';

 var myfunc1 = function(){
  this.myvar1 = 'hello';
  return this.myvar1;
 }

 var myfunc2 = function(somenum=0;){
  this.myvar5 = somenum;
  //calling this.myfunc1() from within this function.
  //do something in here
 }
}

function myfunc3(){
 //calling mynewobj.myfunc1() from within this function.
 for(i=0;i<somelength;i++){
   mynewobj.myvar2 = mynewobj.myvar3[i]; (something to put into the array)
 }
}

var mynewobj = myobj1;

HELP.....!!!!
i really want to get into object oriented world, so thanks in advance.

<script type="text/javascript">

function display(action, id)
{
if (action == 'show')
{
document.getElementById("explanation"+id).style.display = "block";
document.getElementById("link"+id) = "javascript:display('hide', "+id+")";
}

if (action == 'hide')
{
document.getElementById("explanation"+id).style.display = "none";
document.getElementById("link"+id) = "javascript:display('show', "+id+")";
}
}

</script>

Hi all,

First of all, I am not a student and this is not homework. Secondly, I've been programming in C, Motorola assembler, Intel assembler and even GWBasic for years.

I recently (this year) got into Web / Javascript / PHP / HTML programming and I'm clawing up the learning curve. I know a fair amount, but have a long way to go.

OK here's my problem: I've been trying to integrate a WYSIWYG editor (TinyMCE) into a bulletin board software package (PHPBB3).

All is working well except for one big stumbling block that I've been battling for the past MONTH!...:

I want to support the original BBCode system of PHPBB3 (mostly because of the ability for the admin to add custom BBCodes).

So, what I need to do is this:

(1) Select a range of text.
(2) Either REPLACE it with "[tag]selection[/tag]" or else INSERT "[tag]" before and "[/tag]" after.
(3) Lastly, the original selection must remain selected so that additional BBCodes can be wrapped without the need to re-select.

The purpose of (3) is, say, the user clicks "bold" and "italic" and "underline".... all they should have to do is click those 3, not re-select each time.

I've tried doing this:

(1) get the selection range
(2) get the selection text
(3) delete the range contents
(4) create two "contextual fragments" (one for the opening tag, the other for the closing tag).
(5) create a <span> element containing the selection text
(6) Insert it all into the range with range.insertNode()
(7) finally select the new span element

This seems to work fine, but Internet Explorer fails (it complains when I try to get the selection range).

I just don't know what I'm doing wrong... and worse I'm not even sure if I'm attacking the problem the proper way.

Any ideas would be greatly appreciated!

Thanks!

-- Roger

hi,
i would like to know what kind of mechanism does the bolded part trigger

Code:

 G = function(a) {
            if (i !== a) {
                var b = i;
                i = a;
                for (a = 0; a < A.length; ++a)
                    A[a](b)
            }
        }

i dont want to know what the function does, just a wild guess,
would it be the A array is replaced with functions names?
R.

umm Hi i wrote a script with little help from internet but i dont truly understand it, can anyone please explain to me what every line in this script is doing ? im asking polite.

var przed="zostalo do urodzin"
var obecnie="dzisiaj urodziny"
var Tablica=new Array("Jan","Feb","Mar","Apr","May","Jun","Jul","Aug","Sep","Oct","Nov","Dec")

function odliczanie(r,m,d){
theyear=r;themonth=m;theday=d
var dzisiaj=new Date()
var rok=dzisiaj.getYear()


if (rok < 1000)
rok+=1900


var miesiac=dzisiaj.getMonth()
var dzien=dzisiaj.getDate()
var godzina=dzisiaj.getHours()
var minuta=dzisiaj.getMinutes()
var sekunda=dzisiaj.getSeconds()
var dzisiajstring=Tablica[miesiac]+" "+dzien+", "+rok+" "+godzina+":"+minuta+":"+sekunda


dataa=Tablica[m-1]+" "+d+", "+r
dd=Date.parse(dataa)-Date.parse(dzisiajstring)
dday=Math.floor(dd/(60*60*1000*24)*1)
dgodz=Math.floor((dd%(60*60*1000*24))/(60*60*1000)*1)
dmin=Math.floor(((dd%(60*60*1000*24))%(60*60*1000))/(60*1000)*1)
dsec=Math.floor((((dd%(60*60*1000*24))%(60*60*1000))%(60*1000))/1000*1)

if(dday==0&&dgodz==0&&dmin==0&&dsec==1){
document.forms.count.count2.value=obecnie
return
}
else
document.forms.count.count2.value=dday+ " dni, "+dgodz+" godzin, "+dmin+" minut, i "+dsec+" sekund "+przed
setTimeout("odliczanie(theyear,themonth,theday)",1000)
}

odliczanie(2015,1,20)

I've been playing with this workarouns for literally years, but I'm getting fed up with it. Can anyone here suggest a better way of dealing with the following conundrum - or at least clarify why it occurs?

When I have an external stylesheet I can't access the properties assigned therein.

I'll give an example - HTML/CSS/JS are all inseperate files - but everything is called into the HTML as you can see.

HTML:
Code:

<head>
	<script type="text/javascript" src="js.js"></script>
	<link href="style.css" rel="stylesheet" type="text/css" />
</head>
<body>
<div id="box" onclick="showWidth()"></div>
<body>

CSS (style.css)
Code:

#box {
 width: 200px;
}

Javascript (js.js)
Code:

function showWidth(){
	var box = document.getElementById('box');
	alert(box.style.width);
}

Now the alert fired by showWidth() is empty - meaning that javascript can't see the width of the div element 'box'

Now, if I assign width as part of the style attribute of the div javascript thus:

HTML:
Code:

<head>
	<script type="text/javascript" src="js.js"></script>
	<link href="style.css" rel="stylesheet" type="text/css" />
</head>
<body>
<div id="box" onclick="showWidth()" style="width: 200px;"></div>
<body>

javascript can see this and the alert fired by showWidth() shows '200px'.


So, I have two questions:

1. Why?

2. Is there a way of accessing these external style elements without having to define styles inline all the time?


Cheers!
Mike

So today I learned about the ()'s for functions so I was like always studying and I cannot understand how this snippit works, here it is.

Quote:
var say = function(what) {
what('say function');
}

var hello = function (who) {
alert('Hello '+who); // outputs "Hello say function"
}

say(hello);
So the say(hello); is activating the function. The (hello) should be passed for (what) so the function(who) is now inside the other or something?

Can someone please list steps like 1-10 of how this code ends up saying

"Hello say function" at the end? thank you so much

I tried a a few tutorials but still can't get it, can any simply closures please?

<script type="text/javascript">
var myString = "zero one two three four";

var mySplitResult = myString.split(" ");

for(i = 0; i < mySplitResult.length; i++){
document.write("<br /> Element " + i + " = " + mySplitResult[i]);
}
</script>

"split" function splits the string whenever it encounters "space". But please explain me how the strings are stored in "mySplitResult".

And can we use Arrays for this program? If so, can you code it. Thanks in advance!

i got this code from this thread http://www.codingforums.com/showthread.php?t=241809(THanks to jmrker) and i was wondering if you could explain how it works(The creating textboxes and the randomization).
Edit: SOrry i forgot to include the code
Code:

<!DOC HTML>
<html>
<head>
<title> Untitled </title>
<script type="text/javascript">
// From: http://www.codingforums.com/showthread.php?t=241809

var maxSeats = 341;
var rndSeats = 10;

function randOrd() { return (Math.round(Math.random())-0.5); }

function createDisplay() {
  var seating = [];;
  var str = '';
  for (var i=0; i<maxSeats; ++i) { seating.push(0); }
  for (var i=0; i<maxSeats; i++) {
    str += '<input type="text" size="1" id="s'+i+'" value="'+seating[i]+'">';
    if ((i % 33) == 32) { str += '<br>'; }
  }
  document.getElementById('auditorium').innerHTML = str;
}

var sarr = [];
function randomize() {
  for (var i=0; i<maxSeats; i++) { sarr[i] = i; }
  sarr.sort(randOrd);
}

var tptr;
var ptr = 0;

function pauseDisplay() {
  document.getElementById('s'+sarr[ptr]).value = 'x';
  document.getElementById('s'+sarr[ptr]).style.backgroundColor = 'red';
  if (ptr < (maxSeats-rndSeats)) { ptr++; tptr = setTimeout("pauseDisplay()",250); }
}

window.onload = function() {
  createDisplay();
  randomize();
  tptr = setTimeout("pauseDisplay()",250);
}
</script>

</head>
<body>
<div id="auditorium"></div>
</body>
</html>

overImg=[];outImg=[];
outImg[0]=new Image();outImg[0].src="images/enter1.gif";
overImg[0]=new Image();overImg[0].src="images/enter2.gif";
outImg[1]=new Image();outImg[1].src="images/keio.gif";
overImg[1]=new Image();overImg[1].src="images/inria.gif";
function chgImg(img,type){
switch(type){
case "over":document.images[img].src=overImg[img].src;break;
case "out":document.images[img].src=outImg[img].src;break;
}}


why are arrays used here ?

So I had the orginial code just switch images, I was under the impression I could use "var clientData" to make an array. However this is not working out the way I had hoped. Any help or explanation, greatly appreciated.

It's very sloppy now! Don't judge.

Here is my Javascript:
Code:

<script type="text/javascript">
var imgList = [
"../Assets/Images_Revised/40_kitchen.jpg",
"../Assets/Images_Revised/40_stair.jpg",
"../Assets/Images_Revised/C_front2.jpg",
"../Assets/Images_Revised/C_rear_side_combo.jpg",
"../Assets/Images_Revised/C_side.jpg",
"../Assets/Images_Revised/Y_combo.jpg",
"../Assets/Images_Revised/Y_window.jpg"
];

var clientData = [
     "This is Data for Client 1";
     "This is Data for Client 2";
  "This is Data for Client 3";
 "This is Data for Client 4";
 "This is Data for Client 5";
 "This is Data for Client 6";
"This is Data for Client 7"
];


var currentMain = 0;
var currentMainT = 0;

function Prev() 
{
    return ShowMain(currentMain-1);
				return ShowMainT(currentMainT-1);
}
function Next() 
{
    return ShowMain(currentMain+1);
			 return ShowMainT(currentMainT+1);
}


function ShowMain(which)
{
    currentMain = which;
				currentMainT = which;
    if ( currentMain < 0 ) currentMain = 0;
				if ( currentMainT < 0 ) currentMainT = 0;
    	if ( currentMain > imgList.length-1) currentMain = imgList.length-1; 
					if ( currentMainT > clientData.length-1) currentMainT = clientData.length-1; 
    					document.getElementById('mainImg').src = imgList[currentMain];
					    document.getElementById('mainText').src = clientData[currentMainT];
   						 var PD = document.getElementById('Pg');
										var PD2 = document.getElementById('Pg2');
   		 if (PD != null ) PD.innerHTML = 'Image '+(currentMain+1)+' of '+imgList.length;
				  if (PD2 != null ) PD2.innerHTML = (currentMainT+1)+' of '+clientData.length;
    return false;
}

onload = function() { ShowMain(0); }
onload = function() { ShowMainT(0); }
</script>

Here is my area I am showing it.
Code:

<a href="#" onclick="return ShowMain(0); return ShowMainT(0)">1</a
><a href="#" onclick="return ShowMain(1); return ShowMainT(1);">2</a
><a href="#" onclick="return ShowMain(2); return ShowMainT(2)">3</a
><a href="#" onclick="return ShowMain(3); return ShowMainT(3)">4</a
><a href="#" onclick="return ShowMain(4); return ShowMainT(4)">5</a
><a href="#" onclick="return ShowMain(5); return ShowMainT(5)">6</a
><a href="#" onclick="return ShowMain(6); return ShowMainT(6)">7</a
><a href="#" onclick="return Prev();" class="gallery"><</a
><a href="#" class="gallery" onclick="return Next();">></a>

<span id="mainText">Click on a Client for Information.</span>

OK, I work for a company that accepts donations. Currently, the donation page looks nothing like the rest of the site. So I recreated the page to look like the rest of the site. But when I do so, Chrome shows it as a "security risk". Someone looked at it and told me that it's because the .js files aren't compressed and the browser considers this a security risk.

So how do I compress the files?