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JavaScript - Javascript Objects - Out Of Scope On Onbeforeunload
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>
Similar TutorialsI 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 ? Hello everybody am a JavaScript beginner. here is a code making rollovers //////////////////////////////////////////////// window.onload=rolloverInit; function rolloverInit() { for(var i=0; i<document.images.length; i++) { if(document.images.parentNode.tagName=="A") { setUpRollover(document.images); } } } function setUpRollover(currentImage) { currentImage.outImage = new Image(); currentImage.outImage.src = currentImage.src; currentImage.onmouseout = rollOut; currentImage.overImage = new Image(); var source = currentImage.src; var sourceText = source.toString(); if(sourceText.indexOf("png")>0) { currentImage.overImage.src ="images/"+currentImage.id+"_on.png"; } else { currentImage.overImage.src ="images/"+currentImage.id+"_on.gif"; } /*currentImage.overImage.src ="images/"+currentImage.id+"_on.gif";*/ /*currentImage.overImage.src ="images/"+currentImage.id+"_on.png";*/ currentImage.onmouseover = rollOver; currentImage.clickImage = new Image(); if(sourceText.indexOf("png")>0) { currentImage.clickImage.src ="images/"+currentImage.id+"_click.png"; } else { currentImage.clickImage.src ="images/"+currentImage.id+"_on.gif"; } /*currentImage.clickImage.src = "images/"+currentImage.id+"_on.gif";*/ /*currentImage.clickImage.src = "images/"+currentImage.id+"_on.png";*/ currentImage.onmousedown = rollClick; currentImage.parentNode.childImage = currentImage; currentImage.parentNode.onblur = rollOutParent; currentImage.parentNode.onfocus = rollOverParent; } function rollOut() { this.src = this.outImage.src; } function rollOver() { this.src = this.overImage.src; } function rollClick() { this.src = this.clickImage.src; } function rollOutParent() { this.childImage.src = this.childImage.outImage.src; } function rollOverParent() { this.childImage.src = this.childImage.overImage.src; } //////////////////////////////////////////////// 1-I do understand "if iam right, lol" that here ///currentImage.outImage = new Image();/// and here ///currentImage.overImage = new Image();/// and here ///currentImage.clickImage = new Image();/// we are creating an image object "overImage" on the fly which still a property of currentImage object, to keep track and store the current image and new image src. but here ///currentImage.parentNode.childImage = currentImage;/// I am unable to see the point behind creating the childImage object -same rule applied here??? is it really a brand new independent object "still a property of the parent" created on the fly like before? and if so -what is is purpose here?? how the cildImage object is interacting here, what is its purpose? and how it is able to modify "actually change" the <a> object child node Image object "currentImage". it seems stupid question but its quiet simple ---///currentImage.parentNode.childImage = currentImage;/// here I have an object on the fly, a new Image object "childImage", that is Fine until now. ---///this.childImage.src = this.childImage.outImage.src;/// now how the childImage became able to change my parent "<A>" child "currentImage" src ??? how it "childImage" became displayable at all is is because of the assignment here ///currentImage.parentNode.childImage = currentImage;/// ??? 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Hi If i was using c# i would use a generic list and add all my people objects to the list collection but how do i do this in jquery/javascript eg //container object var allObj= { }; //people object var people= { name:"fred",: age:00; }; How do I add many people objects to allObj (the amount of people added in not always the same) eg the final result is something like this allObj -person1 -person2 -person3 -person4 thanks Hello, Here is my situation. I have a java array generated from a JSP on the server side, and saved in the session. This array consists of objects (of say class X). How can I load this array into a javascript array so I can search for a this array based on attributes of the object? Thanks Hi, one of my js file is receiving a variable which is of type object. This object has some html texts. How can get the content of this object (something like value) in javascript? Thanks, Pavan Hi, Can i sort an array of objects in javascript?. I am having the value as Code: var myVarr = [{"name":"xyz","age":21},
{"name":"cde","age":25}].
The above array has two objects. I need to sort by age using javascript. Please help. Regards, anas Hi, I am a begginer in javascript, please help on below I want to create an object with nested objects array like following: var country{ var states=new array(); } var state { city,pincode } this should be called like var city= country[0].state[0].city; any idea will be appreciated I was wondering if there are any sites dedicated to ending javascript objects using the prototype property to give them features like trimming string, removing elements of arrays by name, removing duplicates in arrays, etc. Granted I have functions to do this but there's probably a ton of other good ones out there. Most things I've seen are frameworks like JQuery (which is awesome) but it doesn't extend these objects.
I wrote a log function that took note of various function calls. Thinking that functions are first class objects, and objects have properties, I made the name of each logged function a property of that function, e.g., brightenInnerPara.name = "brightenInnerPara"; Every browser I tried (Firefox, MSIE, Opera, Chrome, Safari) accepted the assignment, no problem. In Firefox and MSIE, the result was what I wanted: brightenInnerPara.name == "brightenInnerPara" But in the others, the result was: brightenInnerPara.name == null Question 1. Which Javascript is correct here? I favor Firefox and MSIE, not merely because they were willing to give me what I wanted, but also because it makes no sense to accept an assignment statement without throwing an error and then give it a null semantics, like Chrome, Opera, and Safari did. I found a workaround, using assignments like this: brightenInnerPara.prototype.name = "brightenInnerPara"; To my surprise, that worked in every browser. But I don't know why. It seems that such assignments are enough to cause each function to have its own distinct prototype. Question 2. Just how inefficient is my workaround, and why does it work? Hello! Is there any way to disable this annoying event? (I'm using IE) Code: <html>
<body onbeforeunload="alert('bye');">
</body>
</html>
I tried to put this at the address bar: Code: javascript: document.body.onbeforeunload=''; But it didn't worker either... Anyone has an idea? Thanks! In my onbeforeunload event, it asked the user whether they want to leave the page or stay on it. When they click "stay on page", I want it to then redirect them to another webpage in the same window. Is there a way to do this, without just showing/hiding divs? Can I override the function? I'm currently trying to do it this way(as seen below) but now the dialog box is not showing up at all. It was working before Any ideas as to what I'm doing wrong, or how to accomplish this task? Code: <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
<title>The Shocking Truth - Cabot Market Letter</title>
<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.4.1/jquery.min.js"></script>
<script type="text/javascript">
$(document).ready(function() {
$("#vid").show();
$("#div2").hide();
});
var test = 1;
function manipulatetest()
{
test = 2;
}
window.onbeforeunload = onbeforeunload_Handler;
function onbeforeunload_Handler()
{ if (test == 1){
$("#vid").hide();
$("#div2").show();
var confirm = confirm("Would you like to stay on this page?");
if (confirm == true) {
window.location = "http://www.google.com";
}
}
}
</script>
</head>
<style type="text/css">
body {
background-color: #e0e6e5;
}
#vid {
margin: 20px auto;
width: 920px;
}
</style>
<body>
<div id="vid">
<video width="920" height="540" autoplay preload controls>
<source src="shockingtruth.mp4" type='video/mp4; codecs="avc1.42E01E, mp4a.40.2"'>
<source src="shockingtruth.webm" type='video/webm; codecs="vp8, vorbis"'>
<source src="shockingtruth.ogv" type='video/ogg; codecs="theora, vorbis"'>
<object width="920" height="540" type="application/x-shockwave-flash"
data="flowplayer-3.2.1.swf">
<param name="movie" value="flowplayer-3.2.7.swf" />
<param name="allowfullscreen" value="true" />
<param name="flashvars" value='config={"clip": {"url": "http://www.cabot.net/videos/shocking-truth/shockingtruth.mp4", "autoPlay":true, "autoBuffering":true}}' />
<p>Download video as <a href="pr6.mp4">MP4</a>, <a href="pr6.webm">WebM</a>, or <a href="pr6.ogv">Ogg</a>.</p>
</object>
</video>
</div>
<div id="div2">
<video width="920" height="540" autoplay preload controls>
<source src="shockingtruth.mp4" type='video/mp4; codecs="avc1.42E01E, mp4a.40.2"'>
<source src="shockingtruth.webm" type='video/webm; codecs="vp8, vorbis"'>
<source src="shockingtruth.ogv" type='video/ogg; codecs="theora, vorbis"'>
<object width="920" height="540" type="application/x-shockwave-flash"
data="flowplayer-3.2.1.swf">
<param name="movie" value="flowplayer-3.2.7.swf" />
<param name="allowfullscreen" value="true" />
<param name="flashvars" value='config={"clip": {"url": "http://www.cabot.net/videos/shocking-truth/shockingtruth.mp4", "autoPlay":true, "autoBuffering":true}}' />
<p>Download video as <a href="pr6.mp4">MP4</a>, <a href="pr6.webm">WebM</a>, or <a href="pr6.ogv">Ogg</a>.</p>
</object>
</video>
</div>
<p style="text-align: center;"><a href="http://www.cabot.net/info/cml/cmlld03.aspx?source=ed01" onclick="manipulatetest();">Click Here To Order</a></p>
</body>
</html>
I set some value like in onbeforeUnload document.getElementById('hGridStateModified').value='YES'; The value is not set and is not available at server side. ( I set some value like document.getElementById('hGridStateModified').value='YES'; The value is available at server side. ) Code /// START f(window.body){ window.body.onbeforeunload = saveBeforeExit; // IE else }else{ window.onbeforeunload = saveBeforeExit; // FX } function saveBeforeExit() { show_confirm(); } function show_confirm() { var result=confirm("Do you want to save the changes before navigating."); if (result==true) { document.getElementById('hGridStateModified').value='YES'; return true; } else { document.getElementById('hGridStateModified').value='NO'; return true; } } ///END Thanks in advance. Best Regards, Sandip Hi, I have the following problem: When I use this script it pops up both if a user tries to close the window and also if he presses the back button. Please tell how to show another window or do another action when the back button is pressed? I know it is possible although a lot of people say it's not. Code: <script type="text/javascript" type="text/javascript">
window.onbeforeunload = confirmExit;
function confirmExit()
{
return "blabla";
}
</script>
I am creating a popup for an online store so that when prospective customers put something in their shopping cart and then try to leave the site, they are offered a coupon in a popup. I am using the following code (FYI, uses prototype.js) Code: Event.observe(document.body, 'click', function(event) {
if (Event.element(event).tagName == 'A' || Event.element(event).tagName == 'INPUT' || Event.element(event).tagName == 'IMG') {
staying_in_site = true;
}
});
window.onbeforeunload = popup;
function popup() {
if (staying_in_site) {
return;
}
if (popup_displayed) {
return;
}
popup_displayed = true;
//popup displayed here
}
The popup is not displayed when the user clicks on a link or submits a form (correct behavior) and it is displayed when the user types in a URL or tries to close the browser (also correct behavior). The problem is when the user clicks the back or forward buttons, the popup is displayed which is not the desired behavior. Anyone here have a solution for this? i dont want to show the confirm message when using window.onbeforeunload. Please suggest a solution to hide the confirm message.. -------------------------------------------------------------------------------- I am currently using onbeforeunload to show user a message 'click ok to save, cancel to continue' Question.. On browser close event (user clicks on window close button 'X' on browser), I do not want to show the message to user. Can you please help with how to check the browser close event. Other details.. If user closes the browser, my ajax request is not getting executed and hence I am not able to save the data to database. Hence I am planning not to show the popup when user closes the browser. Thanks in advance... Sandip 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 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 |
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