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hisoka

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    continuation of understanding what is going on in HTML DOM tutorial

    in JavaScript

    Posted · Edited by hisoka

    Now I know why I cannot understand easily . It is because of the technical concepts used . Because of these concepts I suffer a lot and I get confused and lost .

     

    So please tell me Justsomeguy :

     

    In programming context and java script , HTML context

     

    What is an attribute ?

    what is an object attribute ?

    what is the difference between an object attribute and an attribute ?

    what is the difference between a variable and an attribute ?

    what is an object?

    what is an interface ?

     

    I need a simple and clear understandable definition for all these terms . I googled them but I got more confused :(

    understanding the meaning of some words

    in General

    Posted

    good explanation . I understood . I have some requests :

     

     

    "log file parsing" would refer to having a program read and interpret a log file

     

     

    1) What is the need to have a program reading and interpreting a log file ? and especially what is the need to interpret or execute a log file ?

     

    The lock out an IP address means to prevent users with a particular IP address from seeing your website.

     

     

    it means blocking a user IP . If w3schools forum blocks my IP and then I put

     

    http://w3schools.invisionzone.com in the browser address bar , then what happens ? I get a blank page or a page in which it is written access denied ? or the connection walks until it time out ? or I get server not found or I can see the w3schools forum home page but I will not be able to login ?

    continuation of understanding what is going on in HTML DOM tutorial

    in JavaScript

    Posted

    ok Foxy Mod I used :

    document.getElementById('leftmenuinnerinner')

    and get :

    <div id="leftmenuinnerinner" class="w3-light-grey">

    as an element

     

    then tried to experiment this method :

    element.attribute = new value

    So I had

    leftmenuinnerinner.attributes

    and got :

    NamedNodeMap [ id="leftmenuinnerinner", class="w3-light-grey" ]

    reading about NamedNodeMap here :

     

    https://developer.mozilla.org/en-US/docs/Web/API/NamedNodeMap

     

    I think of it as a method or a function that returns the attributes of an element . What makes me think that

    id="leftmenuinnerinner", class="w3-light-grey"

    both are attributes or unities composed from variable value pair . Am I right or wrong ? if I am wrong correct me please . SO an attributes can be composed of variables- values pairs ?

    continuation of understanding what is going on in HTML DOM tutorial

    in JavaScript

    Posted

    I've already answered this several times now and is getting boring now!

     

    Yes but in many cases , I cannot understand what you are writing . By Foxy Mod or Justsomeguy , I understand very well what they mean , my confusion disappeared and I become enlightened but by you not . Whatsoever I did , in many cases , I cannot grasp what you wrote to me . I am only being honest and telling the truth :(

    understanding a php code

    in PHP

    Posted

    I understand very well .

     

     

    in order for an OS to deal with objects like windows , these objects should be identified . The OS cannot deal with objects if they are not identified to him . A handle is an object identifier or a pointer to that object . In the context of PHP a handle is an object identifier too like files handle , directory handles and so on . If I am wrong correct me

     

    I think it would be more accurate to say that it opens a directory and returns a handle to the open directory.

     

     

    why a handle to an open directory should be returned ? True can be returned if the directory is opened or false if it is not opened but why a handle ?

    continuation of understanding what is going on in HTML DOM tutorial

    in JavaScript

    Posted

    There is something I could not understand :

    document.getElementsByTagName('a')[3]

    gives the third element namely :

    <a title="HTML Tutorial" class="w3-hide-small" href="/html/default.asp">

    but this :

    var x = document.getElementsByTagName('a')[3];
console.log(x);

    gives :

    object {}

    although all what I did is assigning

    document.getElementsByTagName('a')[3]

    to a variable . So I am wondering why ? why the result is different ?

    understanding a php code

    in PHP

    Posted

    In this page of

     

    I found this little PHP code . I tried to understand it but I could not grasp its meaning to 100%

     

    So I will be grateful if you help me understand it :

    <?php
$dir = "/images/";

// Open a directory, and read its contents
if (is_dir($dir)){
  if ($dh = opendir($dir)){
    while (($file = readdir($dh)) !== false){
      echo "filename:" . $file . "<br>";
    }
    closedir($dh);
  }
}
?>
    $dir = "/images/";

    is the directory that will be opened and read

    if (is_dir($dir))

    the if condition checks if the directory exists . Please if I am wrong correct me . Now comes the confusion and I have some questions

    if ($dh = opendir($dir))

    1) the opendir opens a directory handle . What is a handle ? why we need it ? and why we need it to open a directory ? why opendir does not just open a directory and that is all ? what is the difference between opening a directory and opening a directory handle ?

     

    2)if the directory exists then open it . So why do not we put it like this :

    if (is_dir($dir)){
  $dh = opendir($dir)

{...

    why we use another if ? like in :

    if (is_dir($dir)){
  if ($dh = opendir($dir)){

    ??

    while (($file = readdir($dh)) !== false)

    The readdir() function returns the name of the next entry in a directory. This is somehow confusing to me . So what does it mean

    returns the name of the next entry in a directory

    ??

     

    what does it mean

    while (($file = readdir($dh)) !== false)

    ?? why false is used here in this context along with the !== ??

     

     

    continuation of understanding what is going on in HTML DOM tutorial

    in JavaScript

    Posted 

    <a target="_top" href="default.asp">JS HOME</a>
<a target="_top" href="js_intro.asp">JS Introduction</a>
<a target="_top" href="js_whereto.asp">JS Where To</a>
<a target="_top" href="js_output.asp">JS Output</a>
<a target="_top" href="js_syntax.asp">JS Syntax</a>
    element.innerHTML =  new html content

    change the inner HTML of an element . So I would like to change JS HOME to JS HOUSE . I did it like this :

    a.JS HOME = JS HOUSE

    but there was an error saying :

     

    SyntaxError: missing ; before statement

     

    what was that error and how to change the inner HTML from JS HOME to JS HOUSE ??

    continuation of understanding what is going on in HTML DOM tutorial

    in JavaScript

    Posted · Edited by hisoka

    No! it gives you a single object list for ANY single element that use attribute name of 'id' with specific attribute 'id' named value , instead of a multiple object list using tagname where it targets actual tagname of elements.

     

     

    That is very complicated and not 100% true and exact

    document.getElementById(id)

    gives an element by id and not as you wrote to me

     

    meanwhile this :

    document.getElementsByTagName(name)

    gives an array of elements by Tag name . To prove what I write here is what 

    document.getElementById('nav_tutorials')

    gives : a single element

    <div class="w3-dropnav w3-light-grey w3-card-2 w3-center" id="nav_tutorials" style="display: none;">

    and here what

     document.getElementsByTagName('a')

    gives : an array containing more than 241 elements

    HTMLCollection [ <a.w3schools-logo>, <a.topnav-localicons.w3-hide-large.w3-left>, <a.topnav-icons.fa.fa-home.w3-left>, <a.w3-hide-small>, <a.w3-hide-small>, <a.active>, <a.w3-hide-small>, <a.w3-hide-small>, <a.w3-hide-small>, <a.w3-hide-small>, 241 more… ]

    it is single against plural .

    continuation of understanding what is going on in HTML DOM tutorial

    in JavaScript

    Posted

    Like the name suggests it is collection of specific element in this case 'a' elements, much like an array, you then use index ref followed by attribute name to retrieve value.

     

    much like an array

     

     

    Exactly this :)

    document.getElementsByTagName(name)

    gives an array of elements , specified by the tag name between the opening and closing parentheses , as its values . It does not give a raw element like

    document.getElementById(id)

    does

    continuation of understanding what is going on in HTML DOM tutorial

    in JavaScript

    Posted

    I decided to post a new thread concerning this link case I do not understand something I write it here as I think it will be too long .

     

    Continuation of this already opened thread :

     

     

    http://w3schools.invisionzone.com/index.php?showtopic=55183&hl=

     

    Foxy Mod the second method is

    document.getElementsByTagName(name)

    This is a sample of a w3schools source code :

     

    <a target="_top" href="default.asp">JS HOME</a>
    <a target="_top" href="js_intro.asp">JS Introduction</a>
    <a target="_top" href="js_whereto.asp">JS Where To</a>
    <a target="_top" href="js_output.asp">JS Output</a>
    <a target="_top" href="js_syntax.asp">JS Syntax</a>

     

    When I put 

    document.getElementsByTagName('a')

    I got this :

    HTMLCollection [ <a.attribute-value>, <a.attribute-value>, <a.attribute-value>, <a.attribute-value>, <a.attribute-value>, <a.attribute-value>, <a.attribute-value>, <a.attribute-value>, <a.attribute-value>, <a.attribute-value>

    I wonder why I did not get the element as it as namely like this

    <a target="_top" href="default.asp">JS HOME</a>
<a target="_top" href="js_intro.asp">JS Introduction</a>
<a target="_top" href="js_whereto.asp">JS Where To</a>
<a target="_top" href="js_output.asp">JS Output</a>
<a target="_top" href="js_syntax.asp">JS Syntax</a>
<a target="_top" href="js_whereto.asp">JS Where To</a>
<a target="_top" href="js_output.asp">JS Output</a>
<a target="_top" href="js_syntax.asp">JS Syntax</a>
<a target="_top" href="js_statements.asp">JS Statements</a>
<a target="_top" href="js_comments.asp">JS Comments</a>
<a target="_top" href="js_variables.asp">JS Variables</a>
<a target="_top" href="js_operators.asp">JS Operators</a>
<a target="_top" href="js_arithmetic.asp">JS Arithmetic</a>
<a target="_top" href="js_assignment.asp">JS Assignment</a>
<a target="_top" href="js_datatypes.asp">JS Data Types</a>

    .....

    ???

    set a specific time for submitting a form to webserver

    in JavaScript

    Posted · Edited by hisoka

    I am now reading carefully but I need to ask some questions in between .

     

    This is a source code :

    <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<!--[if IE 6]>
<html xmlns="http://www.w3.org/1999/xhtml" lang="en" class="lteIE6">
<![endif]-->
<!--[if IE 7]>
<html xmlns="http://www.w3.org/1999/xhtml" lang="en" id="ie7">
<![endif]-->
<!--[if !(IE 6) & !(IE 7)]><!-->
<html lang="en">
<!--<![endif]-->
<head profile="http://gmpg.org/xfn/11">
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
<title>Local file inclusion | DDXhunter, Hack 'n Web</title>
<link rel="pingback" href="https://ddxhunter.wordpress.com/xmlrpc.php" />
<link rel="alternate" type="application/rss+xml" title="DDXhunter, Hack 'n Web » Feed" href="https://ddxhunter.wordpress.com/feed/" />
<link rel="alternate" type="application/rss+xml" title="DDXhunter, Hack 'n Web » Comments Feed" href="https://ddxhunter.wordpress.com/comments/feed/" />
<link rel="alternate" type="application/rss+xml" title="DDXhunter, Hack 'n Web » Local file inclusion Category Feed" href="https://ddxhunter.wordpress.com/category/web-hacking/local-file-inclusion/feed/" />
    <script type="text/javascript">
        /* <![CDATA[ */
        function addLoadEvent(func) {
            var oldonload = window.onload;
            if (typeof window.onload != 'function') {
                window.onload = func;
            } else {
                window.onload = function () {
                    oldonload();
                    func();
                }
            }
        }
        /* ]]> */
    </script>
    <link rel='stylesheet' id='all-css-0' href='https://s0.wp.com/_static/??-eJx9j90KwjAMhV/IGvzFXYjPsnaxq0uWsqaMvb2dIoKT3YTkcD5ODozROOkVewXOJlL2oU8wRidsEgfC6efaupQ28B+j0GGCB2qsXWde18JuSfwXEO+xkazmLkQywhgaj7qW4WTAonOsdXYwNqFGQi62NYzj+UPNa1seXK3y7mxtHDAlUyaHzEbbErTk3jLEbIGlyVQPQafSXxGSToQzcOPr7niq9sdddbg8nkinjQs=''>https://s0.wp.com/_static/??-eJx9j90KwjAMhV/IGvzFXYjPsnaxq0uWsqaMvb2dIoKT3YTkcD5ODozROOkVewXOJlL2oU8wRidsEgfC6efaupQ28B+j0GGCB2qsXWde18JuSfwXEO+xkazmLkQywhgaj7qW4WTAonOsdXYwNqFGQi62NYzj+UPNa1seXK3y7mxtHDAlUyaHzEbbErTk3jLEbIGlyVQPQafSXxGSToQzcOPr7niq9sdddbg8nkinjQs=' type='text/css' media='all' />
<link rel='stylesheet' id='screenprojection-css-1' href='https://s1.wp.com/wp-content/themes/pub/modularity-lite/library/styles/screen.css?m=1289600476h' type='text/css' media='screen, projection' />
<link rel='stylesheet' id='print-css-2' href='https://s1.wp.com/wp-content/themes/pub/modularity-lite/library/styles/print.css?m=1361549426h' type='text/css' media='print' />
<!--[if lte IE 8]>
<link rel='stylesheet' id='modularity-ie-css' href='https://s0.wp.com/wp-content/themes/pub/modularity-lite/library/styles/ie.css?m=1276553573h&ver=4.5.1' type='text/css' media='all' />
<![endif]-->
<!--[if lte IE 7]>
<link rel='stylesheet' id='modularity-ie-nav-css' href='https://s0.wp.com/wp-content/themes/pub/modularity-lite/library/styles/ie-nav.css?m=1276553573h&ver=4.5.1' type='text/css' media='all' />
<![endif]-->
<link rel='stylesheet' id='all-css-7' href='https://s1.wp.com/_static/??-eJx9i1EKwkAMRC/kGgor6od4lu0S05RsUpotXt+VQqko/gwzzHvwnEI2ragVyhImWYjVAYuNvOYxux+AQa1yI30r6/HbJ7QgllNl048RHpJ4/qfO2ItRqwSN2s0vqQ5Y0GGIQGJ9kjdwL7cunq4xXs5dHF9ualHF' type='text/css' media='all' />
<script type='text/javascript'>
/* <![CDATA[ */
var LoggedOutFollow = {"invalid_email":"Your subscription did not succeed, please try again with a valid email address."};
/* ]]> */

    1)why is some HTML between <--> ?

    document.getElementById(id)

    is used to find element by element id . So I applied it on the source code above like this :

    document.getElementById('ie7')

    but it gives null as a result ? why ?

     

    then

    document.getElementById('all-css-0')

    gives me this :

    <link media="all" type="text/css" href="https://s0.wp.com/_static/??-eJx9j90KwjAMhV/IGvzFXYjPsnaxq0uWsqaMvb2dIoKT3YTkcD5ODozROOkVewXOJlL2oU8wRidsEgfC6efaupQ28B+j0GGCB2qsXWde18JuSfwXEO+xkazmLkQywhgaj7qW4WTAonOsdXYwNqFGQi62NYzj+UPNa1seXK3y7mxtHDAlUyaHzEbbErTk3jLEbIGlyVQPQafSXxGSToQzcOPr7niq9sdddbg8nkinjQs=" id="all-css-0" rel="stylesheet">

    why it gives me that whole stuff . It should give me only as I asked only for the element

     id="all-css-0"

    ???

     

    One last question

    document.getElementById(id)

    is used to find an element by element id . What if I cannot access the source code or I want to find an element by its id without accessing the source code . So for example how can I use 

    document.getElementById()

    to access the

     'all-css-0'

    element without seeing the source code ???

    mysql ditching

    in SQL

    Posted

    So , if I understand what is mentioned in the dictionary very well , they're ditching MySQL in favor of PostgreSQL means that they replaced MySQL database with PostgreSQL? right ?

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