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JavaScript - Possible Variable Scope Problem With Clearinterval? New To Js Please Help.
Hello,
I am trying add some animation effects to a navigation button and am having some problems with my code. I am using setInterval(); and the problem came with trying to clear it using clearInterval(); if i have this code then it seems to clear it fine: Code:
var i = 21;
function w(){
document.getElementById("homebtntop").style.height = i + "px";
i--;
}
function c(){
if(i<=6){
window.clearInterval(t);
}
}
function r(){
t = self.setInterval("w()",15);
}
function slideIn(){
t = self.setInterval("w()",15);
clearInterval(t);
}
but if i then try to call it from inside a function c(); it doesn't work: Code: var i = 21;
function w(){
document.getElementById("homebtntop").style.height = i + "px";
i--;
}
function c(){
if(i<=6){
window.clearInterval(t);
}
}
function r(){
t = self.setInterval("w()",15);
}
function slideIn(){
t = self.setInterval("w()",15);
clearInterval(t);
}
Any ideas? i am sorry if my code makes no ssense or is badly formatted, this is my first time with javasript. Thank you. Similar TutorialsHi, 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. Hi all, I'm just starting out with Javascript as a development language and this will probably be a relatively simple problem for someone to solve for me. I am trying to access a variable (this.bodyEl.innerHTML) from within a function but get an error message indicating that it is "undefined". I know that it is a valid variable because I call it elsewhere outside of the inner function itself. I'm sure this is just a scope issue, but I'd welcome any suggestions on how to solve it with an explanation of where I've gone wrong if you have the time. Here's the code: Code: displayFeed: function(responseData) {
this.bodyEl.innerHTML = "xxxx"; // I can see this
var responseDoc = Presto.Util.parseXml(responseData);
var items = Ext.DomQuery.select("/rss/channel/item", responseDoc);
items.each(function(item, bodyHTML) {
var rssTitle = Ext.DomQuery.selectValue("/title", item);
var rssDescription = Ext.DomQuery.selectValue("/description", item);
var rssLink = Ext.DomQuery.selectValue("/link", item);
// but this results in an undefined error
this.bodyEl.innerHTML = '<a href="' + rssLink + '">' + rssTitle + '</a><br/>';
}); // end of items processing
}
This is a fragment of the code from my script. The first access of "this.bodyEl.innerHTML" works fine, but the second access in the items.each loop doesn't and I get an undefined variable error. Is this a scoping problem, and if so how is it best solved. Thanks in advance, Innes (NZ) I am writing a rather large bookmarklet. For this bookmarklet I would like to have some user-defined variable values. My idea for this is a bookmarklet code something like this Code: var MY_var = "my value";
(function(){
/* usual loading of bookmarklet script file */
var s=document.createElement('script');
s.type='text/javascript';
s.src='https://myhost.com/path/to/my.js;
document.getElementsByTagName('head')[0].appendChild(s);
})();
However I can't access the variable MY_var in the bookmarklet script file "my.js". Is there any way I can change the bookmarklet so that I can access MY_var in my.js? So, I have a very simple script to show/hide a div on mouseover/onmouseout... basically, it's a slide-down menu, without the actual animation.... In any event, clearInterval doesn't seem to do a damn thing, and it's not a scope problem, and have tried it as many ways as I can think... still can't get a timer to clear. Have done a lot of searching, but seems like it typically boils down to a problem of variable scope, which I feel is not the case here. Code: <script type="text/javascript">
var navClosedY = -60;
var navOpenY = 0;
var navObj;
var hideTimer; //globally defined, should be accessible in all the functions.
function showNavControl() {
navObj = top.mainFrame.document.getElementById('navControl');
navObj.style.top = navOpenY + "px";
}
function hideNavControl() {
hideTimer = setInterval("hideNav()", 1000); //never clears.
}
function hideNav() {
navObj.style.top = navClosedY + "px";
clearInterval(hideTimer); //this is the bit that doesn't do anything.
alert(hideTimer); //this works, so I KNOW it can access hideTimer.
}
</script>
And, in the DOM, I just have a div like this: Code: <div id="navControl" class="navControlMain" onmouseover="showNavControl();" onmouseout="hideNavControl();"> I am trying to have a slide show of pictures that are randomly generated stop when the user mouses over the image, I have got everything to work so far except the onmouseover event, even the onmouseout seems to work I don't necessarily need the exact answer but any guidance would be appreciated! <script type="text/javascript"> /* ! [CDATA[ */ setInterval('randomImage()', 4000); //sets the interval of images to show every 4 seconds and runs the function to do so. var imgs = new Array("outdoors.jpg", "kayak.jpg", "fishing.jpg", "scuba.jpg", "biking.jpg"); //the array of images function randomImage() { document.getElementById("image").src = imgs[Math.floor(Math.random()*imgs.length)]; } //the function calls for a random number and applies it to the array of images to show a random picture. /* ]]> */ </script> </head> <body> <p> <img src="outdoors.jpg" width="200" height="200" alt="Random Image" id="image" onmouseover="clearInterval();" onmouseout="randomImage()" /> </p> I am not quite sure what I am doing wrong I've tried mutliple different set ups for the "onmouseover="clearInterval();" and nothing seems to work. Im having some problem with stopping a function i run on loop using setInterval Code: $(document).ready(function(){
var Cycle = setInterval('cycle()', 3000);
/* ... some other functions here ... */
$('.Test').click(function(){
var ID = $(this).attr('ID');
clearInterval(Cycle);
/* ... Rest of this function ... */
if (ID == 'Home')
{
var Cycle = setInterval('cycle()', 3000);
}
console.log(ID);
});
});
When i click a link with the Test class it runs through the function but the loop never stops and im not sure why, cant anyone help me solve this? If you want to see the bits of JS i cut out just say but i dont think there relevant. EDIT: Seems to be the if (ID == 'Home') bit which is causing the problems even though when in the log it shows ID being the word 'Live'. Have i missed some stupid obvious thing ? Whenever i click I have a script that works until I add the clearInterval command, and I am not sure what I have done wrong. The code is: Code:
<script type="text/javascript">
function loadChatTalkRefresh(File,ID,Msg){
var xmlhttp;
if (window.XMLHttpRequest) {
xmlhttp=new XMLHttpRequest();
}
else {
try{
xmlhttp=new ActiveXObject("Msxml2.XMLHTTP");
} catch (e) {
xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");
}
}
xmlhttp.onreadystatechange=function(){
if (xmlhttp.readyState==4 && xmlhttp.status==200){
document.getElementById(ID).innerHTML=xmlhttp.responseText;
empress = setInterval(function(){loadChatTalkRefresh(File,ID,Msg)},3000);
willow = clearInterval(empress,210000);
}
}
var params=Msg;
xmlhttp.open("POST",File,true);
xmlhttp.setRequestHeader("Pragma", "Cache-Control:no-cache");
xmlhttp.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
xmlhttp.setRequestHeader("Content-length", params.length);
xmlhttp.setRequestHeader("Connection", "close");
xmlhttp.send(params);
}
</script>
Hello everybody I have a problem with Java Script damned I want to add the values of several variables in one variable and then use this variable, which contains the values of variables You can see the following example HTML Code PHP Code: <input type="text" name="txt1" /> <br/>age <input type="text" name="txt2" /> <br/><br/> <input type="button" name="submits" value="send"/> Javascript Code PHP Code: field = document.getElementsByName('txt1')[0]; field2 = document.getElementsByName('txt2')[0]; submit = document.getElementsByName('submits')[0]; data = 'data=' + field.value + '&data2=' + field2.value + '&submits=' + submit.value; document.getElementsByName('submits')[0].onclick = function(){ alert(data); } After executing this code I find that the variables are not displayed values As in the following picture I want to know what the cause of this problem ? hi all ~ this is my code, when i change the first checkbox , i want to change the var theSame, but it seams doesn't change in if(theSame == 1) ; but it changes in alert("b"+theSame) , it's queer, how to handle this ? Code: <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.7.0/jquery.min.js" type="text/javascript"></script>
<script type="text/javascript">
$(document).ready(function(){
var theSame = 1;
$("input[name='thesame']").change(function(){
theSame = $(this).is(":checked") ? 1 : 0;
alert("a"+theSame)
});
if(theSame == 1){
$(".check_list input").change(function(){
alert("b"+theSame)
});
}
});
</script>
</head>
<body>
<input type="checkbox" name="thesame">same
<br>
<div class="check_list">
<input type="checkbox" name="son">ppp
<input type="checkbox" name="son">ppp
<input type="checkbox" name="son">ppp
</div>
</body>
</html>
I have a popup in one of my pages which is populated via AJAX call with a list of click-able options, this is all good, however I am now trying to display a javascript tree in the popup but it can not seem to 'see' the javascript routine that creates the tree, even if I hard code that into the popup itself, so the tree starts with d=new dTree() , and javasript is telling me that 'd' is undefined. the code works fine in a regular webpage but when pulled up in a AJAX generated popup it cant see squat? I tried parent.dTree() etc but to no avail. Is this because the javascript is loaded after the main page load via AJAX? if so is it accessible in anyway ? I don't really understand why a.d() fails in the following, or rather why a.d can't access local vars in a, or how to rewrite this so that it can PHP Code: window.a = (function () { var b = '<br>hello '; var c = function (){ document.write(b+'from c') // in this scope we can access the local vars of a }; c() // this will work and write hello from c document.write(b) // this will work and write hello from b return{c:c} })(); a.d = function () { document.write(b+'from d') // even though as far as I can tell I have added d to the object a, } // this still can't access the local vars of a... why not? how can I change that? a.d() // doesn't work :( a.c() // this works too because we returned c in a's return statement Hi there - this seems like it should be an obvious problem - can anyone spot it? I have an object, declared this way: Code: var FK_gid = new picChooser('FK_gid', FK_gidArray);
FK_gid.init();
and a select group like this: Code: <select id = "FK_gid" name = "FK_gid"> <option value="none" selected="true" >None</option> <option value="335" >pics/zoobins.jpg</option> etc. etc. </select> picChooser in construction sets the onchange of the select group like this: Code: this.list = document.getElementById('FK_gid');
this.list.setAttribute("onchange", "FK_gid.displayImage();");
and the object's displayImage(); is like this: Code: this.displayImage = function () {
this.clearImage();
if (this.list.selectedIndex != 0)
{
pic = new Image();
pic.src = this.reformat(this.list.options[this.list.selectedIndex].innerHTML);
img = document.createElement("img");
img.src = pic.src;
this.preview.appendChild(img);
}
}
But whenever I choose something else off the list I get this error message: Code: TypeError: Result of expression 'FK_gid.displayImage' [undefined] is not a function. It's bizarre because when I type FK_gid.displayImage(); into Safari's dynamic console the function works perfectly... Any ideas? Thanks Edd Recently I had an issue while trying to copy an array: I couldn't understand why modifying the new array caused modifications in the old array Old Pedant cleared that up nicely for me in http://www.codingforums.com/showthread.php?t=240020 Now I'm trying to understand closures, and scope and all that fun stuff thanks to Venegal's great tutorial at reallifejs.com and I have the following: Code: <script>
window.USER = (function(){
var Employees = [['Alex',1,'ft',1],['Olivia',2,'ft',1],['Brenda',3,'ft',1],['Michael',4,'ft',1]];
var info = ['Start String'];
var Setup = function(){
}
return{
CheckLogin : function(login){
this.info = Employees[login];
},
Reset : function(){
},
info:info,
Emp:Employees
};
})();
</script>
And I think I got all the kinks worked out, but there was one thing that I don't understand... Based on my other thread I expected the modification of USER.info to overwrite values in USER.Emp Don't get me wrong, I didn't want that to happen, I am just confused as to why it didn't I used the following buttons to test the values of USER.info and USER.Emp but again, writing to USER.info did not overwrite anything in USER.Emp.... Code: <script>
document.write('<button onclick="alert(USER.info)">USER.info read</button>');
document.write('<button onclick="USER.info=\'Test String\'">USER.info write</button>');
document.write('<button onclick="alert(USER.Emp)">Employees read</button>');
document.write('<button onclick="USER.CheckLogin(0)">Check Login</button>');
</script>
So what I guess I'm asking is why? Or maybe: what is happening here, and how does it differ from my last issue? Was it maybe a scope issue? Or maybe something more sinister...? I have devised the following constructor based loosely on the observer pattern Code: Observer = function (ConditionIsTrue , codeToExecute){
var
observer = this ,
ConditionWasMet = false ,
CheckIfReady = function () {
if (ConditionIsTrue()) {
if(!ConditionWasMet)
codeToExecute();
ConditionWasMet = true;
}
else {
if (ConditionWasMet) ConditionWasMet = false;
}
};
Loop.call(observer , CheckIfReady)
observer.speed(1)
};
It works fine, no problems that I know of... But the most interesting thing happened when I attached it to my lib and ran it through the http://closure-compiler.appspot.com/home compiler Code: $['Observer'] = function (//...etc... For the first time the compiler has added something to my global scope Code: var i=!1;
window.$=function(){//...etc...
...
Observer:function(j,k){var h=i;Loop.call(this,function(){j()?(h||k(),h=!0):h&&(h=i)});this.speed(1)}
}
})();
Can someone explain to me why the var ConditionWasMet had to be exported to the global scope? Was it already in the global scope? That would confuse me considering the observer can be called from multiple instances without conflict... But I don't want any surprise conflicts jumping out at me later, I appreciate the consideration. I am doing project exercises from a JavaScript book for a college class. I am creating a brand new .html document for each project. I was under the impression that each unique page name would have its very own cookie scope. But to my surprise it seems adding/loading cookies using 'document.cookie' doesn't assign new cookies to each page. I am seeing that when I try to load document.cookie in new .html pages there are cookies that were already created in past pages in the document.cookie property/string. So whats the 'default' scope of a document cookie. Do I have to set the domain property to get unique cookies for each .html page I create? Thanks for the help. Edit: Okay, it seems that cookies have a default scope of the folder your .html page resides in and all sub-folders that your page resides in. I moved my project folder so that it was a sibling of my projects folder and it got its own cookies that way. I don't even know where to begin with this one. I don't know the terminology for what I am trying to do here, and the sample code is too big and cluttered to post. So I put together the following to illustrate the structure of the object that I am trying to overcome. I have a method chain within an object, and I need to override one of the methods, but when I do so I loose access to the private methods and properties of it's containing object... I googled this for several hours, and the best that I can come up with is that I need to somehow use call() to access the scope of another object. But I don't understand call() or apply() at all, and I've read many tutorials on those... Code: window.oModule['Report'] = (function(){
var _privateProp1 = '' ,
_privateMethod1 = function(){
// ...
} ,
_publicMethod1 = function(){
// ...
} ,
_publicMethod2 = (function(){
var _sub_privateProp1 = '' ,
_sub_privateMethod1 = function(param1,param2){
// ...
} ,
_sub_publicMethod1 = function(){
// ...
} ,
_sub_publicMethod2 = function(start , end){ // I need to replace this method from somewhere else
var _neededValue = '';
for(var i = start ; i<end ; ++i) {
// ...
_neededValue += _sub_privateMethod1(arg1,arg2)
}
return _neededValue;
} ;
return{
'_sub_publicMethod1' : _sub_publicMethod1 ,
'_sub_publicMethod2' : _sub_publicMethod2
}
})() ;
return{
'_publicMethod1' : _publicMethod1 ,
'_publicMethod2' : _publicMethod2
}
})();
alert(oModule.Report._publicMethod2._sub_publicMethod2(1,5)) // This works fine
oModule.Report._publicMethod2._sub_publicMethod2 = function(start,end){ // Doing this modifies the output of all expressions that already call the sub method (which is what I need)
var _neededValue = '';
// ...
return start+end
}
alert(oModule.Report._publicMethod2._sub_publicMethod2(1,5)) // This will alert 6 (as intended)
oModule.Report._publicMethod2._sub_publicMethod2 = function(start,end){ // Doing this modifies the output of all expressions that already call the sub method (which is what I need)
var _neededValue = '';
for(var i = start ; i<end ; ++i) {
// ... different set of instructions
_neededValue += _sub_privateMethod1(arg1,arg2) // This line causes an error: _sub_privateMethod1 is undefined
}
return _neededValue
}
Let's say I'm defining an object and I want the constructor to take one input and ten save it. I'd like to do something like this: function apple(color) { this.color = arguments.color; } But of course that doesn't work because arguments isn't a scope. My question is, is there a scope I can use. What I've been doing instead is this: function apple(new_color) {this.color = new_color;} But that just seems less than perfectly pretty. This is a bit of a strange one. I have been trying to call a function in a child object from the parent object but the child seems to be going out of scope in onbeforeunload function. These function calls work outside of a onbeforeunload, so it only fails when called in onbeforeunload. I can fix it by making the child object a global but I was trying to avoid that. Anyone know why my childobject is out of scope when called in onbeforeunload? Notice I call that same function in windows onload event and it works fine. Here is the code (I have simplified as much as possible to just show the error): Code: <html>
<head>
<title>Broken Page</title>
<script language="javascript" type="text/javascript">
var myparent;
function windowLaunch()
{
myparent = new parent();
myparent.getchildvalue();
window.onbeforeunload = myparent.getchildvalue;
}
function parent()
{
this.mychild = new childobject("myinput");
this.getchildvalue = function()
{
var tmpval = this.mychild.returnvalue();
};
}
function childobject(thename)
{
this.myprop = thename;
this.returnvalue = function()
{
return (document.getElementById(this.myprop).value);
};
}
</script>
</head>
<body id="thebody" onload="windowLaunch();">
<div id="outerdiv">
<span title="This Input Box">My Input:</span><br />
<input id="myinput" style="width: 290px"/>
</div>
</body>
</html>
Question: if I declare a variable in on js fiile, is this available to another js file that is loaded? Answer: yes, it's available (unless inside of a function or something) BUT: does it matter WHERE I declare this variable?? Let's say, I have the following in my HTML file: <script src="script/main.js"></script> And then at the very bottom of my HTML page before the </body> tag I have: <script type="text/javascript">var myvariable = "Sample Data";</script> So, is myvariable available to main.js? In simple tests I've done, yes it does seem to be available But... what if I have a lot of other js code running in between Does this change anything? Thanks OM Hey everyone, I wanted to write my own script for a fade-in animation, since the ones I have found have got too many options or need some framework, which makes them unnecessarily big. I wanted to learn too. Unfortunately, the code didn't work as I wanted, and I commented some things so as to find out what's happening. The only function called from outside is fadeIn with a string as argument (in the example, this string is: d1296668690535). This is the code: Code: var fadems = 500; // Anim. duration in milliseconds
var fps = 20; // Frames per second
function fadeIn(elemId){
var frames = fadems/1000 * fps;
var delay = 1000 / fps;
var incrOp = 1 / frames;
//document.getElementById(elemId).style.zoom = '1';
setOp(elemId, 0);
for(i=1; i<=frames; i++){
debugOutLn("(fadeIn for) elemId = " + elemId);
setTimeout("setOp(" + elemId + "," + incrOp*i + ")", delay*i);
}
}
function setOp(elemId, val){
debugOutLn("(setOp) elemId = " + elemId + "; val = " + val);
// document.getElementById(elemId).style.opacity = val;
// document.getElementById(elemId).style.filter = 'alpha(opacity = ' + val * 100 + ')';
}
Code: function debugOutLn(str){
document.getElementById("debug").innerHTML += str + "<br />";
}
And this is the text it outputs (on Opera 11.01): Code: (setOp) elemId = d1296668690535; val = 0 (fadeIn for) elemId = d1296668690535 (fadeIn for) elemId = d1296668690535 (fadeIn for) elemId = d1296668690535 (fadeIn for) elemId = d1296668690535 (fadeIn for) elemId = d1296668690535 (fadeIn for) elemId = d1296668690535 (fadeIn for) elemId = d1296668690535 (fadeIn for) elemId = d1296668690535 (fadeIn for) elemId = d1296668690535 (fadeIn for) elemId = d1296668690535 (setOp) elemId = [object HTMLDivElement] ; val = 0.1 (setOp) elemId = [object HTMLDivElement] ; val = 0.2 (setOp) elemId = [object HTMLDivElement] ; val = 0.30000000000000004 (setOp) elemId = [object HTMLDivElement] ; val = 0.4 (setOp) elemId = [object HTMLDivElement] ; val = 0.5 (setOp) elemId = [object HTMLDivElement] ; val = 0.6000000000000001 (setOp) elemId = [object HTMLDivElement] ; val = 0.7 (setOp) elemId = [object HTMLDivElement] ; val = 0.8 (setOp) elemId = [object HTMLDivElement] ; val = 0.9 (setOp) elemId = [object HTMLDivElement] ; val = 1 Why is an object reference assigned to what was previously a string? Thanks for the help! |
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