[jQuery] Re: Am I using 'this' too often?
Are you using this: http://tablesorter.com ?
Because it's quite easy to update: http://tablesorter.com/docs/example-ajax.html
On nov. 10, 23:58, George [EMAIL PROTECTED] wrote:
Thanks for the linkhttp://docs.jquery.com/UI/Developer_Guide
You are absolutely right about understanding.
Our professor of math was saying First you have to use it, then you
will understand it.
I found it to be very true.
I had been using JQuery for some time... It's just I am working on a
new project which requires the tablesorter plug-in functionality
married with AJAX.
Unfortunately I were not able to use tablesorter as is. Since data
comes from AJAX and tablesorter plug in does not allow me reload data
into grid easily. I spent some time with it trying to fit it in but
finally gave up and decided that it's time to write my own thing.
And that is how I realized that I know too little about modern
JavaScript language. I used to think that I know it pretty well when
in reality all I could do is to use alert and setInteval functions :)
George.
On Nov 10, 3:11 pm, Balazs Endresz [EMAIL PROTECTED] wrote:
The thing with the other libraries is that jQuery mainly promotes
writing a simple functional plugin, beacause in many cases object-
oriented code is really not necessary. Of course in other cases it is,
like when building a widget:http://docs.jquery.com/UI/Developer_Guide
So I think if you want to write your application that doesn't need to
be a jquery plugin, just use a general design pattern if that's more
suitable. And most likely it will be convenient to write some custom
jQuery plugins too, but that is really
simple:http://docs.jquery.com/Plugins/Authoring
Using jQuery should be very easy, and you don't have to understand it
in depth first, just play with the examples and see what happens.
Understanding how to construct a javascript application is quite a
different thing. Of course they meet some time in the future, e.g. if
you're building a complex jQuery plugin, but this shouldn't be the
point to start I think, just start learning these separately!
Cheers,
Balazs
On Nov 10, 7:24 pm, George [EMAIL PROTECTED] wrote:
I see your point...
I had discovered recently the lack of JavaScript knowledge. And since
I mostly doing web development I realized that I am missing out a lot.
Unfortunately the object oriented approach JavaScript using is
different from other object oriented languages I know (C++, C#, Java)
So I am trying to get up to speed with JavaScript and making up my own
problems/tasks. Like I am learning how 'this' works with JavaScript...
So the code I wrote is not promoted by another library :) It's
promoted by my background in C++ and C# mostly :)
So I chose JQuery as a library to use but before I can freely start
using it I want to understand how things work.
Cause as of right now if you tell me to write JQuery from scratch I
will not be ably even to start :)
And even having full source available does not help much since I often
do not understand what is going on
Thanks
George.
On Nov 10, 12:50 pm, Olivier Percebois-Garve [EMAIL PROTECTED]
wrote:
Well, using the pattern for plugin creation will make your life easier,
and
this will make more sense.
Reading your code, it feels like you are using the structuration
promoted by
another library
On Mon, Nov 10, 2008 at 6:29 PM, George [EMAIL PROTECTED] wrote:
I had looked there probably 10 times :)
Are you implying that I need to convert my code to being Plug-In?
Other than that I do not see how this page
http://docs.jquery.com/Plugins/Authoring
answers my question...
Sorry, but please spell it out for me.
The Plug-In would be the next step for me.. But as of now I am trying
to nail down the use of 'this' in JavaScript as it's a bit different
from what I am used to.
George.
On Nov 10, 11:43 am, Olivier Percebois-Garve [EMAIL PROTECTED]
wrote:
you may want to have a look
herehttp://docs.jquery.com/Plugins/Authoring
On Mon, Nov 10, 2008 at 5:20 PM, George [EMAIL PROTECTED] wrote:
Being newbie in JavaScript I am trying to code my own helper
object
that does pagination.
So here is a snippet of my code.
MyData.prototype = {
blablabla...
PageUp: function() {
this.iFrom += this.pageSize;
this.CheckPageIndex();
},
CheckPageIndex: function() {
if( this.iFrom = this.data.length )
this.iFrom = Math.floor((this.data.length - 1)/
this.pageSize) * this.pageSize;
if( this.iFrom 0 )
this.iFrom = 0;
}
}
Why do I need to call CheckPageIndex using this.CheckPageIndex
when
called from PageUp? It's in the same object...
Without
[jQuery] Re: Am I using 'this' too often?
you may want to have a look here http://docs.jquery.com/Plugins/Authoring
On Mon, Nov 10, 2008 at 5:20 PM, George [EMAIL PROTECTED] wrote:
Being newbie in JavaScript I am trying to code my own helper object
that does pagination.
So here is a snippet of my code.
MyData.prototype = {
blablabla...
PageUp: function() {
this.iFrom += this.pageSize;
this.CheckPageIndex();
},
CheckPageIndex: function() {
if( this.iFrom = this.data.length )
this.iFrom = Math.floor((this.data.length - 1)/
this.pageSize) * this.pageSize;
if( this.iFrom 0 )
this.iFrom = 0;
}
}
Why do I need to call CheckPageIndex using this.CheckPageIndex when
called from PageUp? It's in the same object...
Without 'this' I get an error 'CheckPageIndex is undefined'. Coming
from object oriented languages like C++ I have a trouble
understanding
it.
Or am I doing it wrong and there is a way not to specify 'this' to
many times?
Thanks
George
[jQuery] Re: Am I using 'this' too often?
I had looked there probably 10 times :)
Are you implying that I need to convert my code to being Plug-In?
Other than that I do not see how this page
http://docs.jquery.com/Plugins/Authoring
answers my question...
Sorry, but please spell it out for me.
The Plug-In would be the next step for me.. But as of now I am trying
to nail down the use of 'this' in JavaScript as it's a bit different
from what I am used to.
George.
On Nov 10, 11:43 am, Olivier Percebois-Garve [EMAIL PROTECTED]
wrote:
you may want to have a look herehttp://docs.jquery.com/Plugins/Authoring
On Mon, Nov 10, 2008 at 5:20 PM, George [EMAIL PROTECTED] wrote:
Being newbie in JavaScript I am trying to code my own helper object
that does pagination.
So here is a snippet of my code.
MyData.prototype = {
blablabla...
PageUp: function() {
this.iFrom += this.pageSize;
this.CheckPageIndex();
},
CheckPageIndex: function() {
if( this.iFrom = this.data.length )
this.iFrom = Math.floor((this.data.length - 1)/
this.pageSize) * this.pageSize;
if( this.iFrom 0 )
this.iFrom = 0;
}
}
Why do I need to call CheckPageIndex using this.CheckPageIndex when
called from PageUp? It's in the same object...
Without 'this' I get an error 'CheckPageIndex is undefined'. Coming
from object oriented languages like C++ I have a trouble
understanding
it.
Or am I doing it wrong and there is a way not to specify 'this' to
many times?
Thanks
George- Hide quoted text -
- Show quoted text -
[jQuery] Re: Am I using 'this' too often?
Well, using the pattern for plugin creation will make your life easier, and
this will make more sense.
Reading your code, it feels like you are using the structuration promoted by
another library
On Mon, Nov 10, 2008 at 6:29 PM, George [EMAIL PROTECTED] wrote:
I had looked there probably 10 times :)
Are you implying that I need to convert my code to being Plug-In?
Other than that I do not see how this page
http://docs.jquery.com/Plugins/Authoring
answers my question...
Sorry, but please spell it out for me.
The Plug-In would be the next step for me.. But as of now I am trying
to nail down the use of 'this' in JavaScript as it's a bit different
from what I am used to.
George.
On Nov 10, 11:43 am, Olivier Percebois-Garve [EMAIL PROTECTED]
wrote:
you may want to have a look herehttp://docs.jquery.com/Plugins/Authoring
On Mon, Nov 10, 2008 at 5:20 PM, George [EMAIL PROTECTED] wrote:
Being newbie in JavaScript I am trying to code my own helper object
that does pagination.
So here is a snippet of my code.
MyData.prototype = {
blablabla...
PageUp: function() {
this.iFrom += this.pageSize;
this.CheckPageIndex();
},
CheckPageIndex: function() {
if( this.iFrom = this.data.length )
this.iFrom = Math.floor((this.data.length - 1)/
this.pageSize) * this.pageSize;
if( this.iFrom 0 )
this.iFrom = 0;
}
}
Why do I need to call CheckPageIndex using this.CheckPageIndex when
called from PageUp? It's in the same object...
Without 'this' I get an error 'CheckPageIndex is undefined'. Coming
from object oriented languages like C++ I have a trouble
understanding
it.
Or am I doing it wrong and there is a way not to specify 'this' to
many times?
Thanks
George- Hide quoted text -
- Show quoted text -
[jQuery] Re: Am I using 'this' too often?
The plugin authoring page won't help you much building a class in
javascript.
If you want to use the this keyword less you can use private
variables:
http://javascript.crockford.com/private.html
and there are some more great sources here: http://www.crockford.com/javascript/
But transforming a complex generic js class to a jQuery plugin is
another story as a plugin should generally return a jQuery object.
Some patterns regarding this issue came up here:
http://groups.google.com/group/jquery-en/browse_thread/thread/9dc9be1cc298cbdd
After reading the article on private variables it should be clear, but
briefly the the problem is that if you don't use the this keyword then
CheckPageIndex will be a reference to a variable in the closure
(function) you use it, or if it doesn't exist there then it will be a
global variable. And this way you don't have any closure that could
remember the variable. So you need to define things in a closure
(function).
Anyway, it's much better explained in the article :)
On Nov 10, 6:29 pm, George [EMAIL PROTECTED] wrote:
I had looked there probably 10 times :)
Are you implying that I need to convert my code to being Plug-In?
Other than that I do not see how this
pagehttp://docs.jquery.com/Plugins/Authoring
answers my question...
Sorry, but please spell it out for me.
The Plug-In would be the next step for me.. But as of now I am trying
to nail down the use of 'this' in JavaScript as it's a bit different
from what I am used to.
George.
On Nov 10, 11:43 am, Olivier Percebois-Garve [EMAIL PROTECTED]
wrote:
you may want to have a look herehttp://docs.jquery.com/Plugins/Authoring
On Mon, Nov 10, 2008 at 5:20 PM, George [EMAIL PROTECTED] wrote:
Being newbie in JavaScript I am trying to code my own helper object
that does pagination.
So here is a snippet of my code.
MyData.prototype = {
blablabla...
PageUp: function() {
this.iFrom += this.pageSize;
this.CheckPageIndex();
},
CheckPageIndex: function() {
if( this.iFrom = this.data.length )
this.iFrom = Math.floor((this.data.length - 1)/
this.pageSize) * this.pageSize;
if( this.iFrom 0 )
this.iFrom = 0;
}
}
Why do I need to call CheckPageIndex using this.CheckPageIndex when
called from PageUp? It's in the same object...
Without 'this' I get an error 'CheckPageIndex is undefined'. Coming
from object oriented languages like C++ I have a trouble
understanding
it.
Or am I doing it wrong and there is a way not to specify 'this' to
many times?
Thanks
George- Hide quoted text -
- Show quoted text -
[jQuery] Re: Am I using 'this' too often?
I see your point...
I had discovered recently the lack of JavaScript knowledge. And since
I mostly doing web development I realized that I am missing out a lot.
Unfortunately the object oriented approach JavaScript using is
different from other object oriented languages I know (C++, C#, Java)
So I am trying to get up to speed with JavaScript and making up my own
problems/tasks. Like I am learning how 'this' works with JavaScript...
So the code I wrote is not promoted by another library :) It's
promoted by my background in C++ and C# mostly :)
So I chose JQuery as a library to use but before I can freely start
using it I want to understand how things work.
Cause as of right now if you tell me to write JQuery from scratch I
will not be ably even to start :)
And even having full source available does not help much since I often
do not understand what is going on
Thanks
George.
On Nov 10, 12:50 pm, Olivier Percebois-Garve [EMAIL PROTECTED]
wrote:
Well, using the pattern for plugin creation will make your life easier, and
this will make more sense.
Reading your code, it feels like you are using the structuration promoted by
another library
On Mon, Nov 10, 2008 at 6:29 PM, George [EMAIL PROTECTED] wrote:
I had looked there probably 10 times :)
Are you implying that I need to convert my code to being Plug-In?
Other than that I do not see how this page
http://docs.jquery.com/Plugins/Authoring
answers my question...
Sorry, but please spell it out for me.
The Plug-In would be the next step for me.. But as of now I am trying
to nail down the use of 'this' in JavaScript as it's a bit different
from what I am used to.
George.
On Nov 10, 11:43 am, Olivier Percebois-Garve [EMAIL PROTECTED]
wrote:
you may want to have a look herehttp://docs.jquery.com/Plugins/Authoring
On Mon, Nov 10, 2008 at 5:20 PM, George [EMAIL PROTECTED] wrote:
Being newbie in JavaScript I am trying to code my own helper object
that does pagination.
So here is a snippet of my code.
MyData.prototype = {
blablabla...
PageUp: function() {
this.iFrom += this.pageSize;
this.CheckPageIndex();
},
CheckPageIndex: function() {
if( this.iFrom = this.data.length )
this.iFrom = Math.floor((this.data.length - 1)/
this.pageSize) * this.pageSize;
if( this.iFrom 0 )
this.iFrom = 0;
}
}
Why do I need to call CheckPageIndex using this.CheckPageIndex when
called from PageUp? It's in the same object...
Without 'this' I get an error 'CheckPageIndex is undefined'. Coming
from object oriented languages like C++ I have a trouble
understanding
it.
Or am I doing it wrong and there is a way not to specify 'this' to
many times?
Thanks
George- Hide quoted text -
- Show quoted text -- Hide quoted text -
- Show quoted text -
[jQuery] Re: Am I using 'this' too often?
The thing with the other libraries is that jQuery mainly promotes
writing a simple functional plugin, beacause in many cases object-
oriented code is really not necessary. Of course in other cases it is,
like when building a widget: http://docs.jquery.com/UI/Developer_Guide
So I think if you want to write your application that doesn't need to
be a jquery plugin, just use a general design pattern if that's more
suitable. And most likely it will be convenient to write some custom
jQuery plugins too, but that is really simple:
http://docs.jquery.com/Plugins/Authoring
Using jQuery should be very easy, and you don't have to understand it
in depth first, just play with the examples and see what happens.
Understanding how to construct a javascript application is quite a
different thing. Of course they meet some time in the future, e.g. if
you're building a complex jQuery plugin, but this shouldn't be the
point to start I think, just start learning these separately!
Cheers,
Balazs
On Nov 10, 7:24 pm, George [EMAIL PROTECTED] wrote:
I see your point...
I had discovered recently the lack of JavaScript knowledge. And since
I mostly doing web development I realized that I am missing out a lot.
Unfortunately the object oriented approach JavaScript using is
different from other object oriented languages I know (C++, C#, Java)
So I am trying to get up to speed with JavaScript and making up my own
problems/tasks. Like I am learning how 'this' works with JavaScript...
So the code I wrote is not promoted by another library :) It's
promoted by my background in C++ and C# mostly :)
So I chose JQuery as a library to use but before I can freely start
using it I want to understand how things work.
Cause as of right now if you tell me to write JQuery from scratch I
will not be ably even to start :)
And even having full source available does not help much since I often
do not understand what is going on
Thanks
George.
On Nov 10, 12:50 pm, Olivier Percebois-Garve [EMAIL PROTECTED]
wrote:
Well, using the pattern for plugin creation will make your life easier, and
this will make more sense.
Reading your code, it feels like you are using the structuration promoted by
another library
On Mon, Nov 10, 2008 at 6:29 PM, George [EMAIL PROTECTED] wrote:
I had looked there probably 10 times :)
Are you implying that I need to convert my code to being Plug-In?
Other than that I do not see how this page
http://docs.jquery.com/Plugins/Authoring
answers my question...
Sorry, but please spell it out for me.
The Plug-In would be the next step for me.. But as of now I am trying
to nail down the use of 'this' in JavaScript as it's a bit different
from what I am used to.
George.
On Nov 10, 11:43 am, Olivier Percebois-Garve [EMAIL PROTECTED]
wrote:
you may want to have a look herehttp://docs.jquery.com/Plugins/Authoring
On Mon, Nov 10, 2008 at 5:20 PM, George [EMAIL PROTECTED] wrote:
Being newbie in JavaScript I am trying to code my own helper object
that does pagination.
So here is a snippet of my code.
MyData.prototype = {
blablabla...
PageUp: function() {
this.iFrom += this.pageSize;
this.CheckPageIndex();
},
CheckPageIndex: function() {
if( this.iFrom = this.data.length )
this.iFrom = Math.floor((this.data.length - 1)/
this.pageSize) * this.pageSize;
if( this.iFrom 0 )
this.iFrom = 0;
}
}
Why do I need to call CheckPageIndex using this.CheckPageIndex when
called from PageUp? It's in the same object...
Without 'this' I get an error 'CheckPageIndex is undefined'. Coming
from object oriented languages like C++ I have a trouble
understanding
it.
Or am I doing it wrong and there is a way not to specify 'this' to
many times?
Thanks
George- Hide quoted text -
- Show quoted text -- Hide quoted text -
- Show quoted text -
[jQuery] Re: Am I using 'this' too often?
Thanks for the link http://docs.jquery.com/UI/Developer_Guide
You are absolutely right about understanding.
Our professor of math was saying First you have to use it, then you
will understand it.
I found it to be very true.
I had been using JQuery for some time... It's just I am working on a
new project which requires the tablesorter plug-in functionality
married with AJAX.
Unfortunately I were not able to use tablesorter as is. Since data
comes from AJAX and tablesorter plug in does not allow me reload data
into grid easily. I spent some time with it trying to fit it in but
finally gave up and decided that it's time to write my own thing.
And that is how I realized that I know too little about modern
JavaScript language. I used to think that I know it pretty well when
in reality all I could do is to use alert and setInteval functions :)
George.
On Nov 10, 3:11 pm, Balazs Endresz [EMAIL PROTECTED] wrote:
The thing with the other libraries is that jQuery mainly promotes
writing a simple functional plugin, beacause in many cases object-
oriented code is really not necessary. Of course in other cases it is,
like when building a widget:http://docs.jquery.com/UI/Developer_Guide
So I think if you want to write your application that doesn't need to
be a jquery plugin, just use a general design pattern if that's more
suitable. And most likely it will be convenient to write some custom
jQuery plugins too, but that is really
simple:http://docs.jquery.com/Plugins/Authoring
Using jQuery should be very easy, and you don't have to understand it
in depth first, just play with the examples and see what happens.
Understanding how to construct a javascript application is quite a
different thing. Of course they meet some time in the future, e.g. if
you're building a complex jQuery plugin, but this shouldn't be the
point to start I think, just start learning these separately!
Cheers,
Balazs
On Nov 10, 7:24 pm, George [EMAIL PROTECTED] wrote:
I see your point...
I had discovered recently the lack of JavaScript knowledge. And since
I mostly doing web development I realized that I am missing out a lot.
Unfortunately the object oriented approach JavaScript using is
different from other object oriented languages I know (C++, C#, Java)
So I am trying to get up to speed with JavaScript and making up my own
problems/tasks. Like I am learning how 'this' works with JavaScript...
So the code I wrote is not promoted by another library :) It's
promoted by my background in C++ and C# mostly :)
So I chose JQuery as a library to use but before I can freely start
using it I want to understand how things work.
Cause as of right now if you tell me to write JQuery from scratch I
will not be ably even to start :)
And even having full source available does not help much since I often
do not understand what is going on
Thanks
George.
On Nov 10, 12:50 pm, Olivier Percebois-Garve [EMAIL PROTECTED]
wrote:
Well, using the pattern for plugin creation will make your life easier,
and
this will make more sense.
Reading your code, it feels like you are using the structuration promoted
by
another library
On Mon, Nov 10, 2008 at 6:29 PM, George [EMAIL PROTECTED] wrote:
I had looked there probably 10 times :)
Are you implying that I need to convert my code to being Plug-In?
Other than that I do not see how this page
http://docs.jquery.com/Plugins/Authoring
answers my question...
Sorry, but please spell it out for me.
The Plug-In would be the next step for me.. But as of now I am trying
to nail down the use of 'this' in JavaScript as it's a bit different
from what I am used to.
George.
On Nov 10, 11:43 am, Olivier Percebois-Garve [EMAIL PROTECTED]
wrote:
you may want to have a look
herehttp://docs.jquery.com/Plugins/Authoring
On Mon, Nov 10, 2008 at 5:20 PM, George [EMAIL PROTECTED] wrote:
Being newbie in JavaScript I am trying to code my own helper object
that does pagination.
So here is a snippet of my code.
MyData.prototype = {
blablabla...
PageUp: function() {
this.iFrom += this.pageSize;
this.CheckPageIndex();
},
CheckPageIndex: function() {
if( this.iFrom = this.data.length )
this.iFrom = Math.floor((this.data.length - 1)/
this.pageSize) * this.pageSize;
if( this.iFrom 0 )
this.iFrom = 0;
}
}
Why do I need to call CheckPageIndex using this.CheckPageIndex when
called from PageUp? It's in the same object...
Without 'this' I get an error 'CheckPageIndex is undefined'. Coming
from object oriented languages like C++ I have a trouble
understanding
it.
Or am I doing it wrong and there is a way not to specify 'this' to
many times?
Thanks
George- Hide quoted
