GetNestedTag() - v1

Introduction

Function (parser) to retrieve the contents of a (nested) HTML-tag, say a DIV.

This is useful if you have a HTML file/or variable and you want to extract a block of data, for example the CONTENT or MAIN div or a UL that is used for a menu. By default it will get the first occurrence of a tag, so if you want to use it to get more than one tag you will have to use a loop, for example if you wanted to get all Paragraph <p> tags from the HTML data. (See example 5)

Parameters

GetNestedTag(data,tag[,occurence=1])

Parameter	Description
Data	Html code as variable, you can read a file into a variable using FileRead, http://www.autohotkey.com/docs/commands/FileRead.htm
Tag	(Nested)tag to retrieve from html data. It will retrieve the first occurrence by default.
Occurence	By default it retrieves the first occurence of the Tag, you can use occurrence to retrieve the second, third etc. To get all occurrences of a tag use a loop as shown in example 5 below.

Code Examples

In the examples below a variable ‘get’ is used just to make it a little easier to pass on the tag to get to the function. If you want to pass on the tag directly in the function call you need to use "" to escape the quotes (if they are present), which depends on how the HTML is written, so it could be any of these:

GetNestedTag(html,"<div id=""content"">")
GetNestedTag(html,"<div id='content'>")
GetNestedTag(html,"<div id=content>")

It only works correctly with properly formatted html.

#Include GetNestedTag.ahk ; Not required if you place GetNestedTag.ahk in your library

Gosub, GetHtml

; Example 1 - get DIV header
; Pretty simple as it is not a nested DIV
get=<div id="header">
MsgBox,,Example 1 - get DIV header, % GetNestedTag(html,get)

; Result:
; <div id="header"><!-- start header -->
; <h1>GetNestedTag(data,tag)</h1>
; <!-- /end header --></div>

; Example 2 - get content
; More complex as it is a nested DIV
get=<div id="content">
MsgBox,,Example 2 - get DIV content, % GetNestedTag(html,get)

; Result:
; <div id="content"><!-- start content -->
; .... all lines in between ...
; <!-- /end content --></div>     

; Example 3a - get table data
; Nested TABLE
get=<table id="data">
MsgBox,,Example 3a - get table data, % GetNestedTag(html,get)

; Example 3b - get table subdata
get=<table id="subdata">
MsgBox,,Example 3b - get table subdata, % GetNestedTag(html,get)

; Example 4a - get UL menu
; Nested UL, 3 levels
get=<ul id="menu">
MsgBox,,Example 4a - get UL Menu, % GetNestedTag(html,get)

; Example 4b - get the first UL
get=<ul>
MsgBox,,Example 4 - get UL, % GetNestedTag(html,get)

; Example 5 - get all paragraphs
Loop
  {
   tag:=GetNestedTag(html,"<p",A_Index)
   If (tag = "")
     Break
   MsgBox,,Example 5 - get P (%A_Index%/5), % tag
  }

ExitApp

 GetHtml:
 html=
 (
 <!DOCTYPE html>
 <html lang="en-us">
 <head>
 <title>Example HTML</title>
 </head>
 <body>
 <div id="wrapper"><!-- start wrapper -->
  <div id="header"><!-- start header -->
   <h1>GetNestedTag(data,tag)</h1>
  <!-- /end header --></div>
  <div id="navigation"><!-- start navigation -->
   <ul id="menu">
    <li>Menu option 1</li>
    <li>Menu option 2
     <ul class="submenu">
      <li>Submenu 2.1</li>
      <li>Submenu 2.2
       <ul><!-- ul1 -->
        <li>Submenu 2.2.1</li>
        <li>Submenu 2.2.2</li>
        <li>Submenu 2.2.3</li>
        <li>Submenu 2.2.4</li>
       </ul>
      </li>
      <li>Submenu 2.3</li>
      <li>Submenu 2.4</li>
     </ul>
    </li>
    <li>Menu option 3</li>
    <li>Menu option 4</li>
    <li>Menu option 5    
     <ul class="submenu">
      <li>Submenu 5.1</li>
      <li>Submenu 5.2</li>
     </ul>
    </li>
    <li>Menu option 6</li>
   </ul>
  </div><!-- /end navigation -->

    <div id="leftcolumn"><!-- start leftcol -->
     <ol>
      <li>Scripting</li>
      <li>Hotkeys</li>
      <li>Automation</li>
     </ol>
    <!-- /end leftcol --></div>

    <div id="content"><!-- start content -->

    <div class="intro"><p>AutoHotkey is a free, open-source utility for Windows. With it, you can:</p></div>

    <div style="clear:both;"></div>

    <ul><!-- ul2 -->
    <li>Automate almost anything by sending keystrokes and mouse clicks.</li>
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    <div style="clear:both;"></div>

    <p>Here is a nice table with some data:</p>

    <table id="data">
      <tr>
        <th>1</th>
        <th>2</th>
      </tr>
      <tr>
        <td>
        <table id="subdata">
         <tr>
          <td>3a</td>
          <td>3b</td>
         </tr>
        </table>
        </td>
        <td>4</td>
      </tr>
      <tr>
        <td>5</td>
        <td>6</td>
      </tr>
    </table>

    <p>Nothing more to report in content.</p>

    <!-- /end content --></div>
    <div id="rightcolumn"><!-- start rightcol -->
     <ol>
      <li>Automation</li>
      <li>Hotkeys</li>
      <li>Scripting</li>
     </ol>
    <!-- /end rightcol --></div>

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   </div>
 <!-- /end wrapper --></div>
 </body>
 </html>
 )
Return

Source: https://github.com/hi5/GetNestedTag/