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JavaScript - Window.setinterval Question
Hey guys,
I'm trying to use the setInterval method for a function, but it's not working. Here's the code. Code: function interval_demo() {
function int_sum() {
alert("I will add two numbers for you, and then add another extra number!");
var n1 = prompt("What's your first number?", "");
var n2 = prompt("What's your second number?", "");
var sum = n1 + n2;
return sum;
}
window.setInterval('int_sum()', 1000);
}
window.onload = interval_demo;
The function works fine if I use window.setInterval('int_sum', 1000). What's the problem with setInterval('int_sum()', 1000)? Correct me if I'm wrong, but isn't that also a valid way to call functions in the setInterval method? Thanks! Similar TutorialsHey guys, Im playing around with JS trying to learn more and i have come across this bit of code Code: <script type="text/javascript">
function print () {
document.write("Words ");
}
setInterval("print()", 1000);
</script>
Just having problems getting it to display correctly in all browsers its displaying the first Words fine in all but will only continue to reprint "Words" in chrome. Thanks any help tips ideas would be great. Hey everyone, Below is the code for a javascript timer. I don't understand why the way I'm using the windows object setInterval isn't working. I've highlighted the problematic areas. Please have a look. Code:
function timer() {
var display = document.getElementById('countdown'); //creates the dom by getting span with id of "countdown".
var time = new Date(60*10*1000);
function zeroPad(number) { //places a 0 in front of the number if it's less than 10. For example 09 or 08.
if (number<10)
return '0' + number;
else
return number;
};
function interval() {
var min = zeroPad(time.getMinutes());
var sec = zeroPad(time.getSeconds());
display.innerHTML = min + ":" + sec ; //Displays the time in the span with the id of "countdown".
time.setSeconds(time.getSeconds()-1);
if (time < 0) {
alert("Times UP");
break;
}
};
window.setInterval(interval(), 1000); //Why isn't the setInterval working once the timer is initiated?!!!
}
window.onload = timer; //initiates the function
I don't understand why the setInterval isn't working. It should be calling the function every second- what's wrong with the code? Thanks! Hi, In my "main.js" file I need to create a new window with a button. If the button clicked a function in the "main.js" file is called. I tried the following, but new window does not see the function in the "main.js" file. function create_new_window() { my_window = window.open ("","mywindow1","status=1,width=350,height=150"); my_window.document.write('<H1>My Window ...</H1>'); my_window.document.write('<form><input type="button" value="Submit" onClick="submitData();"/></form>'); .... } function submitData() { ... } If anyone could please help me with this basic feature, I would much appreciate it! I have this function: Code: function popupWin(href)
{
window.open(href, "popup", "width=770,height=675");
return;
}
but when I run it, it opens in the same window. I'm really new to Javascript, and I'm sure it's a basic fix, I just can't seem to figure it out. Thank you!! Hi I'm just making a little test script, I want to add friends on myspace here my script so far: Code: <script>
/*Start own function*/
var x = 0;
function loadUniquePage(username) {
var visits = x+1;
if (visits > 1){
opener=null;
}
if (opener && !opener.closed){
opener.focus();
}
else if (opener && opener.closed){
opener=null;
}
else {
var page = "http://www.myspace.com/my/friends/addtofriends/" + username;
var myWin = window.open(page,'','width=800,height=600,scrollbars=1');
opener = myWin;
$('#Hint').html('Click follow and then close www.myspace.com/my/friends/addtofriends/' + username + ' to get coins');
check_if_open(page, username);
}
}
function check_if_open(page, username) {
var hauser = setInterval(function() {
if (opener && opener.closed){
$('#Hint').html('You closed it');
opener=null;
clearInterval(hauser);
}
}, 1000); }
/*End own function*/
</script>
<div id="Hint"></div>
<a href="javascript:void(0);" onclick="loadUniquePage('isroyalrecords');" >Add to Friend</a>
Now my question is can I somehow know which site is open, because when I'm not logged in to myspace www.myspace.com/my/friends/addtofriends/' + username + ' redirects me to the homepage of myspace? Hi, I've been working on a clock script that will appear on a frame of my site. Originally, I had used the following to refresh the page every second to the script shows the updated time and seconds. Code: <meta HTTP-EQUIV="Refresh" url="WEBSITE HERE" CONTENT="1"> This worked but unfortunately, there was the refresh "tick" sound every second, which became too annoying! I found the "setInterval" method and tried to apply it to my code. For the purpose of this thread, I've created another script similar to mine, but about 1/20 as long, though the result is the same. I would like it to re-run every second using setInterval, but it only runs once and then disappears. Code: <script type="text/javascript">
<!--
updateClock();
setInterval ("updateClock()", 1000);
function updateClock()
{
var t = new Date();
var seconds = t.getSeconds();
document.write(seconds);
}
// -->
</script>
Any help would be appreciated!! Thanks. Hi Guys, I'm new to javascript and I'm trying to have a delay. I seem to be having trouble with the setInterval(). Will someone please be able to tell me what have I have done wrong? Code:
function viewData()
{
var num = 10;
setLoop(num);
}
function setLoop(i)
{
setInterval(loopOpacity(i), 300);
}
function loopOpacity(i)
{
i--;
var iNum = "0." + i;
document.getElementById("fade").style.opacity = iNum;
if(i == 4)
{
document.getElementById("viewData").className = "view";
clearInterval(int);
}
else
setLoop(i);
}
function closeData()
{
document.getElementById("fade").style.opacity = 1;;
document.getElementById("viewData").className = "close";
}
Thanks for your help, tecmeister. Hi and thanks for taking the time to help me. Just to say in short, I'm a musician and not a programmer, the only thing I have learned is html many years ago, however JS and Java I have never done at all. About 6 month ago I asked a colleague of mine to make me a new website. All went very nicely apart from one little detail as the title says. The popup window with the music player (me playing), keeps on going in the background as soon as a person continues to browse through the page. Unfortunately, my colleague hasn't answered any of my emails asking him to fix it, and therefore I found this forum through google with hope that perhaps you'd be able to help me out. I have found the part of the code that shows the function to open a new window (in the <head></head> part of the page). Here it is: <code> <SCRIPT LANGUAGE="javascript"> <!-- function otworz(adres) { noweOkno = window.open(adres, 'okienko', 'menubar=no, toolbar=no, location=no, scrollbars=auto, resizable=yes, status=no, width=270, height=260, left=30, top=30') noweOkno.focus() } --> </script> </code> Here is the part which is already in the <body> of the page <code> <a href="javascript:otworz('muzyka.htm')"><img src="muzyka.png"></a> <!-- <object type="application/x-shockwave-flash" id="player1" allowscriptaccess="always" allowfullscreen="false" data="OriginalMusicPlayer.swf" width="170" height="90"><param name="movie" value="OriginalMusicPlayer.swf" /><param name="FlashVars" value="playlistXmlPath=music/playlist.xml" /></object> --> </code> My colleague is Polish and hence the Polish language of the function and the htm file. If it would be more usefull for you to see the actual website, then I can of course give you the adress as well, but perhaps the code above would do. In any case, I thank you for any help or advice you can give me. Greetings Daniel I have this: function doThese(id){ clearInterval(interval); doThis(id); var interval = function(){ setInterval("doThis('"+id+"')", 2000); } interval(); doThisToo(id); alsoDoThis(id); } Everything works fine together. However when I run the doThese() function a second time(with different id), the interval keeps using the id of the first run. Thought clearinterval would fix that.. it doesn't. Any suggestions? Thx in advance. Can anyone tell me how the following code actually works please? I've been trying to work out exactly why I need it all, but can't understand it at all! Code: var speed = 50
var myInterval
var pause
function start(){
window.clearInterval(pause)
myInterval = setInterval("auto()",speed)
}
pause = setInterval("start()",3000)
The body onLoad is set to run start(). If anyone can explain why this code is needed I would be very greatful. In my mouseClick function I have a setInterval which call cursor function. Unfortunately it's not working. Below is my code: Code: var canvas;
var ctx;
var cursor_width = 1;
var cursor_height = 16;
var wait_time = 500;
var repeat_time = 1000;
var height = 22;
var textbox = new Array();
var repeat;
function Class(__proto__) {
var Class = __proto__.hasOwnProperty("constructor") ? __proto__.constructor : (__proto__.constructor = function () {});
Class.prototype = __proto__;
return Class;
}
Class.prototype = Function.prototype;
function init(CanvasName) {
canvas = document.getElementById(CanvasName);
ctx = canvas.getContext("2d");
}
//============================================= Textfield =============================================
textfield = new Class({
constructor: function (x, y, w) {
this.x = x;
this.y = y;
this.w = w;
this.text = new Array();
var coordinates = new Array();
coordinates.x = x;
coordinates.y = y;
coordinates.w = w;
textbox.push(coordinates);
},
display: function () {
ctx.beginPath();
ctx.rect(this.x, this.y, this.w, height);
ctx.closePath();
ctx.stroke();
canvas.addEventListener("mousedown", this.mouseClick, false);
},
cursor : function () {
this.cursor_posX = this.x + 3;
this.cursor_posY = this.y + 3;
ctx.beginPath();
ctx.strokeStyle = "black";
ctx.rect(this.cursor_posX, this.cursor_posY, cursor_width, cursor_height);
ctx.closePath();
ctx.stroke();
setTimeout(this.animateCursor, wait_time);
},
animateCursor :function () {
ctx.strokeStyle = "white";
ctx.stroke();
},
mouseClick: function (evt) {
var mouse_posX = evt.clientX - canvas.offsetLeft;
var mouse_posY = evt.clientY - canvas.offsetTop;
var self = this;
// if mouse coordination is within a texfield display cursor
for (child in textbox){
if((mouse_posX > textbox[child].x && mouse_posX < (textbox[child].x + textbox[child].w)) && (mouse_posY > textbox[child].y && mouse_posY < (textbox[child].y + height))) {
repeat = setInterval(this.cursor, repeat_time);
canvas.addEventListener("keypress", this.displayText, false);
break;
}
else
{
clearInterval(repeat);
canvas.removeEventListener("keypress", this.displayText, false);
}
}
}
});
I tried the following code as well but I received a message telling me it's not a function Code: repeat = setInterval("this.cursor()", repeat_time);
Can anyone help me please How would you use setInterval so that theres a delay each time javascript runs through a certain loop?
i have found a very simple ajaxexample on the internet, when this works i can adept it to my site, but it doesn't work :-( anybody sees why? Code: <div align="center" id="timeval">--:--:--</div>
<button id="stop">Stop</button>
<script src="jquery.js"></script>
<script>
$(document).ready(function()
{
//ajaxTime.php is called every second to get time from server
var refreshId = setInterval(function()
{
$('#timeval').load('ajaxTime.php?randval='+ Math.random());
}, 1000);
//stop the clock when this button is clicked
$("#stop").click(function()
{
clearInterval(refreshId);
});
});
</script>
and the phpscript:
ajaxtime.php
<?php
echo date("g:i:s A");
?>
Hello, I'm having trouble with some scripts conflicting and interrupting my animation. I have a small website build around Joomla and I do my own modules and components.. I've made a simple browser game that uses Javascript's setInterval to highlight some elements. A few days ago I decided to add some advertising banners to cover the server costs but those banners are using Javascript and are interrupting my "game"... Is there a way to stop that from happening ? The script flow goes like this... Step 1. An XMLHttpRequest is being made and the server returns X numbers of elements out of Y total elements that need to get highlighted. Step 2. The elements default state is "blank" then a loop goes through the Y elements and sets a className of "highlight" on the elements that need to get highlighted. Step 3. The setInterval is being called and executes the code that highlights the X elements on every interval. Code: mytimer = setInterval ( animation, 500 ); The animation variable holds a function that changes the elements with class "highlight" to "highlighted". Some pseudo-code: Code: // After all the AJAX requests and more doodle codes...
while(i < num_arr.length) { // num_arr holds the X numbers to get marked as highlight
document.getElementsByTagName('td').item(X).setAttribute('name', 'highlight');
i++;
}
mytimer = setInterval ( animation, 500 );
var animation = function() {
document.getElementsByTagName('td').item(X).className = 'highlighted';
// There is an "if" check to kill the setInterval if no more Xs are found
clearInterval(mytimer);
}
* The above code is just a short example of the actual script * Any help would be much appreciated.. Thank you. Hello. I'm trying to get a script (and an html page, I guess) to run constantly, and I'm pretty sure I should be using setInterval() to do this. But I'm not familiar enough with Javascript to know what I'm doing wrong, or what I need to fix. This is the code... Code: <html>
<head>
<script type="text/javascript" src="wz_jsgraphics.js"></script>
<script type="text/javascript">
<!--
function initialize_field() {
var jg = new jsGraphics();
var pixel_spacer = 10;
var field_length = 1000;
var field_width = 600;
jg.drawRect(pixel_spacer,pixel_spacer,field_length,field_width);
//...
return jg
}
function main() {
our_field = initialize_field();
dateobj = new Date();
current_time = dateobj.getMilliseconds();
our_field.drawString("Hello world!",current_time,500);
our_field.paint();
}
-->
</script>
</head>
<body onload="main(); setInterval('main()', 250 )">
</body>
</html>
If I understand setInterval() correctly, this should cause the page to run the main() function every 250 seconds. And within main(), the "Hello world!" string is being drawn at some point between 0 and 1000 pixels, depending upon the number of milliseconds, so it should essentially be scrolling across the screen. But I can only get it to "scroll" if I hammer F5 to repeatedly load the page. How can I get the main() function to run repeatedly? I tried calling main() from main(), but that did not work well... Thanks for any suggestions you have! I found a little chat script online and I wanted to check it out. When I integrated it into a page I created, for some reason this will not work correctly <body onload="setInterval('chat.update()', 1000)"> I tested it with two different browswers open Lets say on two different browser windows you have user1 and user2 if user1 types 'Hello' it will not show up on user2 window but if user2 types 'Hi' then on user2 window it will say user1 says Hello user2 says Hi so basically for user1 to see what user2 has wrote, user1 has to type something first and send it to see what user2 said. hope you understand, if you would like I could post up the code. thanks for your time - I am more of a hacker than a coder. I have a webpage with a setinterval script I put together which reloads another page's php content into an iframe on the page. It works fine in IE, but doesnt work in FF or Chrome. (I dont want to use a refresh meta though that seems to work in IE & Chrome but not FF.) Here's the script snippet I wrote: Code: <script>
window.setInterval("reloadIFrame();", 5000);
function reloadIFrame() {
document.frames["chat"].location.reload();
}
</script>
<iframe id="chat" src="../chat/buffer.php" width="100%" height="200"></iframe>
on the page's first load, all the info is there in the iframe, but except for IE, updates do not show (the reloads dont seem to occur). I have a javascript that precedes this script containing a setTimeout, but never had issues with it. I can post the entire page code, if needed... thanks again. HWL Hi all, I'm new to Javascript, and having an issue with getInterval. For my programming languages class we have to create a simulation of waves breaking on a shore from above. I've decided to use a canvas object and Javascript for this animation, but am getting stuck on refreshing the frames. Here is the code I have so far: Code: var shoreline = new Array();
var waves = new Array();
var canWidth = 600;
var canHeight = 400;
var waveNum = 0;
var count = 0;
function wave() {
setupShore();
var canvas = document.getElementById("canvas");
canvas.setAttribute("width",canWidth);
canvas.setAttribute("height",canHeight);
var ctx = canvas.getContext("2d");
createWave();
setInterval(update(ctx), 1000);
}
function update(ctx) {
if(waves.length != 0) {
drawWater(ctx);
drawShore(ctx);
drawWaves(ctx);
updateWaves();
}
}
function drawElement(ctx, x, y, width, height, fillcolor) {
ctx.fillStyle = fillcolor;
ctx.fillRect(x, y, width, height);
}
function setupShore() {
for(var i = 0; i <= canWidth/5; i++) {
shoreline[i] = Math.round(canHeight/5); // + Math.floor(Math.random()*101);
}
}
function createWave() {
/* Wave array setup:
[ [waveID1, [node1, node2, ..., nodeN]],
[waveID2, [node1, node2, ..., nodeN] ] */
waves.push([waveNum, []]);
for(var c = 0; c <= canWidth/5; c++){
waves[waves.length-1][1].push(canHeight);
}
waveNum = waveNum + 1;
}
function destroyWave() {
waves.shift();
}
function drawWater(ctx) {
drawElement(ctx, 0, 0, canWidth, canHeight, "#336699");
}
function drawShore(ctx) {
for(var s = 0; s <= shoreline.length; s++) {
drawElement(ctx, s*5, 0, 5, shoreline[s], "#FFCC00");
}
}
function updateWaves() {
for(var u = 0; u < waves.length; u++) {
var limit = waves[u][1].length;
for(var v = 0; v < limit; v++){
var temp = waves[u][1][v]-5;
waves[u][1][v] = temp;
if(waves[u][1][v] <= shoreline[v]){
destroyWave();
}
}
}
}
function drawWaves(ctx) {
for(var w = 0; w < waves.length; w++) {
for(var n = 0; n <= waves[w][1].length; n++){
y = waves[w][1][n];
drawElement(ctx, n*5, y, 5, 5, "Purple");
}
}
}
As you can see, the idea is that each 5-pixel wide node of the shore and wave are stored in arrays so that the position of each node can differ. The wave() function initializes all the required data, and then calls setInterval on update(). The function update() draws the water, shore, and wave, and then updates the wave position node-by-node. Ideally, setInterval would cause this to happen repeatedly, so that the wave would appear to move closer to the shore every 1000ms. However, this is not the case. It appears as though setInterval is working for one pass of update(), but fails after the first pass. You can tell that this is happening because the wave appears at its starting position, but does not continue to move. Any idea why this is happening? I read somewhere that setInterval can be broken by one-time functions, but I'm not sure. If you'd like to see what it's currently doing in a browser, I've hosted it here. Once I've got this animating properly I can continue my project, but I've hit a roadblock. Thanks in advance for your help, I'm really stuck. Marcus If you try some codes and then catch exception, it should catch the exception when there is. However, if there is a setInterval method in the try clause, then the exception cannot be caught... why??? the following works ( a usual method is invoked in the try clause): Code: <script language="javascript" type="text/javascript">
function invoke()
{ var i=0;
return i.x.y;
}
try
{
alert(invoke());
}
catch(ex){ alert(ex); } //Any Exception will be caught.
</script>
if the highlighted line is changed as below (using setInterval method), then it fails... Code: <script language="javascript" type="text/javascript">
function invoke()
{ var i=0;
return i.x.y;
}
try
{
setInterval(alert('invoke())',1000);
}
catch(ex){ alert(ex); } //The Exception will NOT be caught.
</script>
any idea? thx in advance Hi, all. I am very new to Javascript (and coding generally); the code below is part of my first project. I teach, and just built a flash card / timed-drill site for my students which has a number of setIntervals going on as a central part of its timed functionality. I ran into a problem when trying to create controls that would allow adjustments in the drill timing within the same page. The running setIntervals simply need to be killed when a variable is changed through the user form input, but I cannot seem to do this through any means known to me. I've tried about 15 different approaches and none of them work. Here is one function in my code that runs a setInterval and refuses to be killed by any external stimuli (like, say, a specific killerVariable value): Code: function countdownTimer()
{
var countdown=timeLimit/1000;
var countdownString=countdown+'';
document.getElementById("countdownTimerArea").innerHTML = countdownString;
var killCountdown=setInterval(function() {
countdownString=(countdown-1)+'';
document.getElementById("countdownTimerArea").innerHTML = countdownString;
countdown--;
if (countdown==0)
{
clearInterval(killCountdown);
}
},1000);
}
The clearInterval shown in the code *does* work correctly. However, if I try to set up another conditional, killerVariable-value-driven clearInterval in this function (or even change the above to if (countdown==0 || killerVariable==1), it does not stop the setInterval when killerVariable changes. In the end, because I needed this to go online quickly, I "solved" this problem by simply creating a few different versions of the page with hard-coded variable values and having the form control buttons take the user to those pages rather than trying to stop and restart the timed processes within the same instance of the script. However, this was a real kludge of a solution, and I am still very curious as to what I could have done to actually make this work. Is there anything I could have done short of totally rewriting the function as a loop with setTimeout? Alternately-- and this *does* seem incredibly basic, but I can't get an answer no matter how I phrase my Google and CF queries-- is there some way to hard-kill a currently running function via another function in Javascript? I think that would have solved my problems. |
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