Object Loses Scope With Onchange?
Mar 10, 2009
I will do my best to explain this one and sorry if the title isn't that great. I am trying to write a javascript object and it is my first time, so it isn't that great and of course I have trouble.The object is suppose to populate a dropdown (popMake()) and then add an onchange event (checkValue()) to it. It seems to do this fine but when the select box is changed, I no longer have access to object, it's parameters, etc. In checkValue I don't have access to this.currentMake which was just set or anything (already said that).I believe it has something to do with scope (possibly closure, but I didn't see how it would fit her). So how can I do something like this and still have access to the object after the click?Code below:Code:
window.onload = function() {
var mm = new makeModel();
mm.popMake();
[code]....
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Feb 26, 2010
I am working on a script to allow the user to click on an image to turn table header locking on and off. Everything appears to work fine, with the exception of one quirk that is occurring when I run the test page in Internet Explorer (7, in this case). If you click on the icon once to turn on header locking, it works. If you then click the icon again, it turns off header locking, as it is supposed to. But after that, you can no longer click on the icon. It is as if it loses the event binding. I am not removing or in anyway creating a new instance of the icon (although I did try using live() instead of click() just to be safe). Also, if I run this same page in Firefox, I do not have this problem. You can see the example page and view the complete source at [URL]
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Aug 5, 2011
I have an object with a single Method to load content from a xml file. The problem is... how do I add a property to the object to store the data loaded?? I tryed adding a simple Array inside the object, but didn't work.
[Code]...
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Apr 6, 2006
I had a need for a two dimentional array. Looking for this solution, I
ran accross a statement than all Javascipt arrays were arrays of
objects. So I created a function prototype, at least thats what I was
calling it:
function objRow(vartype, varaddr1, varaddr2)
{
this.type = vartype;
this.addr1 =varaddr1;
this.addr2 =varaddr2;
}
Next I did:
var myobject=new objRow("1", "1234 Main St.", "Apt 101");
At this point I was able to see myobject.addr1 or any other variable in
the object instance.
Now I added this object to a table.
var aryTestTable= new Array();
aryTestTable[0]= myobject;
At this point I could see
aryTestTable[0].addr1
Next I tried an additional object
myobject=new objRow("1", "1234 Main St.", "Apt 101"); //with
different data
And added it to the table
aryTestTable[1]= myobject;
Where I could see:
aryTestTable[1].addr2 or any other variable.
so far so good. Then I started the actual application code where I was
reading a database table and creating the objects and adding them to
the table. This was in a for loop wherein the myobject=new objRow("1",
"1234 Main St.", "Apt 101"); was instantiated.
After the for loop was finished, I could not access the data in the
table - undefined.
So my questions are: Have the my object instances popped off the stack?
and What is the alternative way to implement this table of rows of
values.
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Mar 26, 2006
I'm having trouble getting the following code to work properly. Every time I try to access the private testing variable from the priveleged MyMethod it gives an error. Says it can't find testing and that it has no properties so I can't run a push() command on it.
function MyClass()
{
var testing = new Array();
// define the method
function MyMethod()
{
this.testing.push("hello");
}
// make the method priveledged
this.MyMethod = MyMethod;
}
// a test function it ensure the variables declared here are isolated
function Start()
{
var myClass = new MyClass();
myClass.MyMethod();
document.write("[" + myClass.testing + "]");
}
Start();
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Dec 13, 2011
i'm having a slight problem understand how to use this.myVar in an object. And I use prototype.
[Code]...
Does anyone know how I can use this.myvar within the function. I have tried binding and bindAsEventListener.But nothing I've done has been able to get the right value!
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Feb 14, 2011
I'm a little puzzled over the possibility of accessing an array. I've declared the previd id - in the proxy.invoke call which works just fine (we have already implemented an .each loop which also works. My problem is this - after accessing the proxy.invoke function, the previd is populated correctly with push but after the call, we cannot seem to access the previd array to make a join to a string. Here's the basics of the code.
var previd = [];
proxy.invoke("validdateIDCard", p_caregiverid,
function(validaterID) {
var valcard = validateID;
previd.push(valcard);
}, onPageError);
var finalvalue = previd.join("|"); <-- this is where the problem lies - cannot seem to read the variable...
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Aug 5, 2007
I'm a newbie to JSON and have been trying to parse some data and send it to a function that writes some html. I can do this in IE, but I can't get it to work in firefox. Code:
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Jun 10, 2011
I created this code for a sliding panel and it works well. But I'm struggling to take the object oSidebar out of the global scope. I would prefer that it were a property of the clicked event object. That is, I want to be able to use 'this.oSidebar' within the click event. I've posted the whole page here along with the click image.
[Code]...
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Aug 13, 2006
I'm developing an AJAX toolkit in which I needed a way to write a subset of a markup language to modify the running copy of the document. When implementing part of the append parser I came against a problem. What I'm basically doing is reading the append XML tag, looking where it says It has to add code and then clone the nodes inside that tag and attempt to insert them in the document. The problem comes when I'm trying to append, it seems like all my cloned nodes lose all it's style properties, for example several <li> items would come one next to the other instead of one below the other with the round bullet separation, or an image won't load the actual image. Code:
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Nov 4, 2010
i have a html page which loose all text formatting and show white space between the table data cells. It works fine in the browser. Is there any way to fix it?
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Apr 23, 2010
At the moment, I have datepicker working on my page, and I really like it. When I tab through my form, and the date field receives the focus, the calendar opens. I pick a date and it closes. but some times I'm tabbing backwards through a form, or tabbing over a date field that already has a date in it, and just want to "tab on by". Datepicker open when the date field receives the focus, but does not close when the date field loses the focus.
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May 15, 2009
I want to stop the flowplayer video player when the page loses focus. Either another tab is being viewed or another app is in focus...
I tried (document).blur, ("#pagewrapper").blur, ("#pagewrapper").mouseout...
I have everything working except the page.blur... I can't seem to find an event that will work for this.
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Jun 8, 2011
I have to execute some code on the onchangeevent of a SELECT / RADIO. On IE9, it works fine. But on IE7, IE8 and Chrome, the event fires only after I lose focus from the SELECT / RADIO concerned. I tried addEventListener(), $("#some_control").attr("change", some_function), $("#some_control").change()but all in vain.
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May 6, 2011
I've googled the heck out of this, and although I'm finding plenty of solutions, I'm having trouble understanding them. I'm very new to jquery, and brand new to ajax. My problem is, I have a php application using several jquery effects. I've just started learning ajax and it is going really well, this stuff is incredible! But all the ajax loaded data loses the jquery effects. I get that it is a DOM issue, and I've seen that others have used "live" (i think?) to fix this, but I honestly just have no understanding of how toimplementanything that I'm seeing.
This is part of my ajax...
And this is the main effect I need to get working.
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May 29, 2010
I would like to know how to make an element Loses the Focus and How to check if it is focused or not?
cause after someone clicks in the search button I want it to lose the focus in the Text Input
and I want to check if its focused.
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Mar 16, 2010
Im using keyup function to track text typed in input box. The idea is to perform incremental search in db. This works fine. After this I update the html dynamically to display the filtered resuts and at the same time I must dynamically rewrite the html for input box code. After this the keyup function is not working anymore, allthough the id tag is the same? How should I get around this?
$('#filterBox').keyup(function() {
$('#status').text(this.value.length)
if (this.value.length > 2) {
filter($.trim(this.value));
}
});
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Jan 28, 2011
Is there something that will update as soon as the user changes information in a textbox as appose to what onChange does, which is update once the focus has been taken off of the textbox? I am writing a custom cart and I am using AJAX to update the price according to how many they are ordering, I was hoping to have it update the price as soon as the user put in the volume, but it doesnt update until the user clicks somewhere else on the page.
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Feb 10, 2010
Can I target the element and base an onChange outside of directly calling it in the element tag?
Due to the nature of my script, the best I can do is wrap a tag around the element.
example of what I am trying to do
Code:
<script>
document.form.field1.onchange = function();
<script>
And if this might work, can I call it in the head or must it come after the element.
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Jan 19, 2011
got a problem with this snippet...
function writeColum () {
var x = document.getElementById("wc").value;
var y = document.getElementById("title").value;
if (event.keyCode == 32) {
[Code]...
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Oct 11, 2006
I'm trying to write an 'each' function for a JavaScript array that
behaves like Ruby's Array#each. (It doesn't matter if you know Ruby to
help with this question.)
My problem is the scope of 'this' inside the iterator callback. I would
like it to be the same as the object that called the each() on the
array. Right now I have to do that with a closure or an
explicitly-passed 'this' scope. For example:
function Person( inName, inCats ) {
this.name = inName;
this.cats = inCats;
}
// Using a closure
Person.prototype.showInfo = function( ) {
var me = this;
this.cats.each( function( catName ){
alert( me.name + " owns " + catName );
} );
}
Array.prototype.each = function( inCallback ){
for ( var i=0,len=this.length; i<len; ++i ){
inCallback( this[ i ], i );
}
}
phrogz = new Person( 'Gavin', [ 'Fuzzles', 'Kitty' ] );
phrogz.showInfo( );
--Gavin owns Fuzzles
--Gavin owns Kitty
// Using an explicit scope
Person.prototype.showInfo = function( ) {
this.cats.each( this, function( catName ){
alert( this.name + " owns " + catName );
} );
}
Array.prototype.each = function( inScope, inCallback ){
for ( var i=0,len=this.length; i<len; ++i ){
inCallback.call( inScope, this[ i ], i );
}
}
Inside the each() function, arguments.callee.caller would give me a
reference to the showInfo function object. What I am looking for is a
way to access the scope of the 'this' receiver within that particular
invocation of showInfo(), so that I can use it in place of inScope
without having to pass 'this' each call.
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Jul 20, 2005
If I do . . .
myForm=document.tstForm;
function initialSetup(){
myForm.fld01.value="Test 01"
myForm.fld02.value="Test 02";
myForm.fld01.focus();
}
Then, in the body tag, I do onLoad="initialSetup()",
the script doesn't work and I get a "myForm has no properties" error
I know it'll work if I move it within the function, but I figured a
global variable would retain its value within the function. Why not?
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Jun 26, 2007
In the method nextImage, I can't figure out how to access thumbs. It keeps coming back as undefined. (Using Firefox)
function runPortal(portal_number){
// there are multiple runPortals on each webpage
this.portal = document.getElementById('portal'+portal_number); // represents the div that holds the images
this.thumbs = this.portal.getElementsByTagName('a').length; // represents all the images within the div that will be rotated
this.length = this.thumbs.length; // that's how many images will be rotated
// Hide everything
for (var j=0;j<this.thumbs.length;j++){
if (j==0) continue; // Don't hide the first one
this.thumbs[j].childNodes[0].style.display = 'none'
}
this.nextImage = function (){
// there are a fixed number of images to rotate. Start over
if (this.i >= this.length){
this.i = 0;
}
// One fades away, the next appears
Effect.dglPuff(this.thumbs[this.last].childNodes[0], {duration:.6, from:.7});
Effect.Appear(this.thumbs[this.i].childNodes[0]);
// iterate to the next image for the next run
this.last = this.i;
this.i++;
}
// Set up the image rotator
// here is where I started guessing
// thumbs needs to belong to the object rotator, I guess.
this.rotator = new PeriodicalExecuter(this.nextImage, 4); // This object runs the function every 4 seconds
this.rotator.portal = document.getElementById('portal'+portal_number); // represents the div that holds the images
this.rotator.thumbs = this.rotator.portal.getElementsByTagName('a'); // represents all the images within the div that will be rotated
this.rotator.length=this.length; // that's how many images will be rotated
this.rotator.i=0; // the counter for what image we're one
this.rotator.last=0; // the counter for the previous image
}
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Jul 23, 2005
Given the following working code:
function attributes() {
var attr1 = arguments[0] || '_'
var attr2 = arguments[1] || '_'
return (
function (el1, el2) {
var value1 = el1[attr1] + el1[attr2];
var value2 = el2[attr1] + el2[attr2];
if (value1 > value2) return 1;
else if (value1 < value2) return -1;
else return 0;
}
);
}
var a = [
{ a:'smith', b:'john' },
{ a:'jones', b:'bob' },
{ a:'smith', b:'jane' }
];
a.sort(attributes('a', 'b'));
for (var i =0; i < a.length; i++) {
document.write(a[i].a + ', ' + a[i].b + '<br>');
}
My question is, are attr1 and attr2 guaranteed to exist through
the lifetime of a.sort(attributes('a', 'b'))?
As I understand it, the anonymous inner function reference I am
returning is a property of attributes(). As such, when I return a
reference to the anonymous inner function, the outer attributes()
function must continue to exist (as must attr1 and att2) until
there are no further references to the inner anonymous function.
As a result, there is no danger of attr1 or attr2 "disappearing"
during the repeated calling of the anonymous inner function.
Is my explanation basically correct, or am I deluding myself and
I'm just lucky that the garbage collector hasn't recovered attr1
or attr2 while the sort is still going on? In other words, is the
behaviour I'm seeing consistent and predictable, or should I
change my approach?
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Jul 23, 2005
I have a script in which a function launched by a START button
continuously calculates and writes a value to a text box. The
calculation is done in a for loop. In the loop is a conditional that is
a global variable, a boolean. If the boolean is true, break ends the
loop (or is supposed to!). A STOP button has an onclick function that
sets the global variable to true.
What happens, though, is that the function for the STOP button is
not executed until the for loop reaches the maximum value set for i.
Anyone know how you can get one button to stop a process started by
another?
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Apr 4, 2011
I'm showing a form in a Simplemodal dialog in combination with ajaxForm() to redirect the resulting page to another DOM element. The success function of ajaxForm() closes the modal dialog.The resulting page in the other DOM element has no access to the jquery function $(). When I load a page using ajax into the DOM element there is no issue access the jquery function, this only happens when I redirect the resulting page from the ajaxForm() function.
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