Problem With Onmouseout - Object Has No Properties Error
May 14, 2006
I've got an image gallery in which users can navigate between the next and previous image by clicking on the right or left half respectively of the current image. When the mouse is over the left half an arrow pointing to the left is shown on the image and when on the right an arrow to the right. It works fine if i use inline javascript but i'm trying to achieve the same effect unobtrusively and with an addEvent function. The onmouseover part works fine but from the function that fires on the onmouseout event i get the following error in Firefox and the arrow is not hidden:
how to add extra properties to html elements as I was storing data in html attributes. After looking at some others code including Raphael and this addEvent code. [URL] They seem to treat objects just like an array. obj[property] = value; This would have been extremely helpful to know previously as I have needed to be able to include variables in property names - but have resorted to making the whole thing a string and calling exec() on it.
I have a number of show/hide images on my site which allows the user to click on various thumbnails to open up the full image using layer based styles.
However, my Javascript seems to have developed an error saying that the object has no properties and then takes me to the following line of code:
obj.visibility='hidden';
This code was written for me so that i could use the script dynamically with PHP an alter the number of div layers it needed to generate.
The full(?) javascript for this function is:
function showImg(myShow) { var loopNum=99; for (x=1; x<=(loopNum); x++) //1 based loop
I am developing in firefox 1.0+, but will be working in an msie 6.0+ produciton environment ( not my choice, but when is it ever? ).
the desired output is that when the end-user selects two radio buttons, one from each 'group', the form / page will open an alert window displaying the values of the radio buttons selected without having the end-user left-click on a submit button.
i cannot figure out why I'm getting the "document.[formName] has no properties" error mesasage in the javascript console....
I've been tryin to figure out why I am getting this error for some time now. Any ideas?
<script language="Javascript">
<!-- var lead_id = "<?php echo $LeadID; ?>"
if (lead_id > "") { var state = "<?php echo $row['State']; ?>"; var confirmer = "<?php echo $row['Confirmer']; ?>"; var day = "<?php echo $row['ApptDay']; ?>";
if (state == "MD") { alert("hi"); document.forms['form1'].state.options[0].selected = true; }}
//--> </script>
state is equal to MD so I am getting the alert "hi", but it breaks right there and gives me this error. document.forms.form1 has no properties heres my form tag:
i'd like to know objects properties and/or methods.
saying i do have an object "o" being part of the dom (a div or an ul...) how could i list (introspection) all the properties and methods attached to this object ?
i know it is possible in javascript but don't remeber how to ...
Do many programmers remember most of the object properties and methods or do they use IDE or references to find those specific objects. I'm starting to learn Javascript and seeing all the different type of objects available can be depressing. :(
I am fairly familiar with the concept of Objects and their properties and methods, but javascript being object based as opposed to object oriented has me stumped on how to access an object's properties from an onclick event handler created for another object created within the original object.
In the example below, I have a constructor function called anyObj. to which I pass an object reference to an element.
anyObj has 3 properties and one function increaseWidth()
increaseWidth() creates a new button with an onclick event handler and this is where I have a problem.
The onclick function needs to increase the value of anyObj's this.width property. I originally had a line this.width += 10; in the onclick but quickly realised why this wasn't working because the this in the onclick function refers to the new button object and not the this.width property of anyObj.
The workaround I have used, and it works, is to make a copy of all the this.xxxxx properties. eg. width = this.width; and use the width variable in the onclick as you can see below. This "workaround" works fine but doesn't feel ideal to me.
So is there a better way to access the anyObj()'s properties from within the onclick function than the way I have done it? Obviously I would prefer to not have to make copies of all the anyObj() properties like I have to make them accessible to the onclick function.
Say x in a XML Http Request Object ... meaning it's either XMLHttpRequest (firefox) or ActiveXObject (IE)
This line of code works in firefox... x.someProp = "someValue"; alert(x.someProp);
But in IE I get "Object doesn't support this property or method" I need to place a custom property on the object. Is there any way I can do that in IE?
I've created an object and within this object, I've added an eventlistener. But the problem now is that after addEventListener is being called to access a callback function, the callback function is not able to access the properties within its own class. Code:
I am fairly familiar with the concept of Objects and their properties and methods, but javascript being object based as opposed to object oriented has me stumped on how to access an object's properties from an onclick event handler created for another object created within the original object.In the example below, I have a constructor function called anyObj. to which I pass an object reference to an element.
anyObj has 3 properties and one function increaseWidth()
increaseWidth() creates a new button with an onclick event handler and this is where I have a problem.The onclick function needs to increase the value of anyObj's this.width property. I originally had a line this.width += 10; in the onclick but quickly realised why this wasn't working because the this in the onclick function refers to the new button object and not the this.width property of anyObj.
The workaround I have used, and it works, is to make a copy of all the this.xxxxx properties. eg. width = this.width; and use the width variable in the onclick as you can see below. This "workaround" works fine but doesn't feel ideal to me.So, what I am asking advice on is, is there a better way to access the anyObj()'s properties from within the onclick function than the way I have done it? Obviously I would prefer to not have to make copies of all the anyObj() properties like I have to make them accessible to the onclick function.
Code:
function anyObj(divObj){ this.elem = divObj; this.width = 50;
Well, I've been working with JS for three years and have a great experience here. But! I still have no really acceptable answer to the following question:
What is the principle difference between declaring methods/properties in the constructor function body and via prototypes.
Are there any real GURUs? Let's discuss the issue.
In JavaScript 1.5, objects can use special getter and setter functions [1] for properties. However, these only seem to be implemented in Gecko and, AFAICT, don't seem to be part of ECMAScript.
Is there an alternative syntax I can use that is standardised in ECMAScript and also (preferably) interoperably implemented in several browsers? Or, do I have to use ordinary getFoo() and setFoo() functions. Code:
I want to programmatically list all properties of JS object from C++ code (I am using Mozilla's JSAPI). I know I can go up the prototype chain with JS_GetPrototype, then enumerate each object's own properties with JS_Enumerate.
I have an object: Myobject and properties for the object: Myobject.color, Myobject.width, Myobject.height The scripts returns TRUE if I query Myobject.color or Myobject.width etc. I want to loop through de properties like so:
Code: var properties = ['color', 'width', 'height'] for (var i=0; i<properties.length; i++) { Myobject.properties[i]; // Returns UNDEFINED }
I don't know why but after the animate() function it's like all the properties get wiped. PHP Code: bubble.prototype.expand = function() { var _this = this; this.mLeft = parseInt($(this.div).css('margin-left').split('px')[0]); this.mTop = parseInt($(this.div).css('margin-top').split('px')[0]); this.iWidth = $(this.iconImg).width();//icons dimensions this.iHeight = $(this.iconImg).height(); .....
I'm using code below to run a function when the user move the mousepointer from within a DIV and outside it:The idea is that that mousepointer motion shall hide the DIV.
Code:
document.getElementById(theID).onmouseout = hideDiv; if (document.getElementById(theID).captureEvents) document.getElementById(theID).captureEvents(Event.MOUSEOUT);
It kind of works, but the problem is that if I move the mousepointer to fast out of the DIV then it will not trigger.The div in question has some elements within it, and originally it was allmost fully covered by those element... and then the onmouseout did not work that good....So I had to create some padding for the div to make it detect the onmouseout better... kind of work... but sometimes failes to trigger on the onmouseout.That padding also make the div not look that good ... so would like to get rid of all the padding as well, and make it work, if possible.I have tested this in the following browsers and get pretty much same behaviour in them all:IE8, Firefox (latest), Chrome (latest), Safari for win (latest beta)...
How does one trigger the execution of a method within an object or any other code/function with the setting of an object property?
More elaboration for those who want it:
Suppose we have anObjectType, with a property .description, whose value can be a string, and the value of .description actually describes the structure of anObjectType as a string. (The details are not important about how the structure is described, but if you want something concrete, think of 'anObjectType' as a DOM Node of type NODE_ELEMENT, and ..description as the property .innerHTML.)
When an instance of anObjectType is created, the value of description is created with the instance. Indeed, the value of description may not be set with the construction of anObjectType, but it might be added to the prototype of anObjectType.
But the property .description is not merely read-only. Fetching the value of .description returns the string which describes the structure of the object in a meaningful way.
When .description is set with a value of type string, the string is checked to see if it properly describes a legally formed structured for anObjectType, and the instance (and only that instance) of anObjectType is completely re-built: it might possibly be destructed and then re- constructed, or all properties (but not methods) which involve descendant objects are changed to conform to the described structure.
The question is, the setting of a string value of the property ..description of object anObjectType does not automatically trigger a method/methods (or an exception??) for doing something (such as restructing the object) as a result of the setting of an object property.
