Macro: Pause Until Web Page Element Exists [Example]

web_browser
webscrape
javascript

#1

Continuing the discussion from How can I check if a form field exists?:

Use Case

  • Sometimes you need to open a web page URL, but then pause until a certain HTML element is loaded, that you want to use.
  • The below macro does exactly that.
  • It uses the JavaScript querySelector method that uses CSS selectors to define the target Element
    • Using querySelector is much easier than using XPath, but this same approach could be used with XPath (requires modification to the JavaScript)
  • The best way to determine the HTML Element and the required CSS Selector is to open the web page, and right-click on the target UI element, and select "inspect".
    • You can use either Chrome or Safari to do this, but I recommend Chrome, even if ultimately you will be using Safari in your workflow.
    • If you need help with this, post a new topic with the URL and a screen shot of the UI element you want to target.

MACRO:   Pause Until Web Page Element Exists [Example]

~~~ VER: 1.0    2019-02-26 ~~~

DOWNLOAD:

Pause Until Web Page Element Exists [Example].kmmacros (10 KB)
Note: This Macro was uploaded in a DISABLED state. You must enable before it can be triggered.


ReleaseNotes

Author.@JMichaelTX

PURPOSE:

  • Pause Macro Until Web Page Element Exists
    • Element defined by querySelector CSS

REQUIRES:

  1. KM 8.2+
  2. macOS 10.11.6 (El Capitan)
  • KM 8 Requires Yosemite or later, so this macro will probably run on Yosemite, but I make no guarantees. :wink:

NOTICE: This macro/script is just an Example

  • It has had very limited testing.
  • You need to test further before using in a production environment.
  • It does not have extensive error checking/handling.
  • It may not be complete. It is provided as an example to show you one approach to solving a problem.

How To Use

  1. Make changes to Macro as stated in the "Macro Setup" below
  2. Trigger this macro.
    • It will then open the web page and pause until the HTML element is found.
    • The Pause Until (While Action) will auto-cancel if not found within one minute.

MACRO SETUP

  • Carefully review the Release Notes and the Macro Actions
    • Make sure you understand what the Macro will do.
    • You are responsible for running the Macro, not me. ??
      .
  1. Assign a Trigger to this maro..
  2. Move this macro to a Macro Group that is only Active when you need this Macro.
  3. ENABLE this Macro.
    .
  • REVIEW/CHANGE THE FOLLOWING MACRO ACTIONS:
    (all shown in the magenta color)
    • Open URL
    • Set CSS Selector
    • If desired, change the TimeOut of the "Pause Until" While Action

TAGS: @WebScrape @UI @Browser @JavaScript @PauseUntil

USER SETTINGS:

  • Any Action in magenta color is designed to be changed by end-user

ACTION COLOR CODES

  • To facilitate the reading, customizing, and maintenance of this macro,
    key Actions are colored as follows:
  • GREEN -- Key Comments designed to highlight main sections of macro
  • MAGENTA -- Actions designed to be customized by user
  • YELLOW -- Primary Actions (usually the main purpose of the macro)
  • ORANGE -- Actions that permanently destroy Variables or Clipboards,
    OR IF/THEN and PAUSE Actions

USE AT YOUR OWN RISK

  • While I have given this limited testing, and to the best of my knowledge will do no harm, I cannot guarantee it.
  • If you have any doubts or questions:
    • Ask first
    • Turn on the KM Debugger from the KM Status Menu, and step through the macro, making sure you understand what it is doing with each Action.

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Script on near identical mac won't loop properly
How can I check if a form field exists?