How to use browser embedded scripts to automate web page elements operations and numerical calculations?

Browser embedded scripts to realize web page automation and numerical calculation

This article discusses how to use browser embedded scripts to automate web page elements operations and numerical calculations. We will solve a practical case: automatically clicking the web button, extracting the values, calculating and entering the results, and performing them loop until a specific condition is met. The user hopes to implement a script, automatically click the "Stimulus" button, obtain the "Current Efficiency" value, substitute the formula (100 - 当前效率) × 344 calculation, and enter the result into the specified input box. Finally, click the "OK" button, and loop this process until the "Current Efficiency" reaches 100. There is a problem with the Tampermonkey script provided by the user, and this article will analyze and provide improvement solutions.

Problem analysis and solutions

The main problems with user scripts are inaccurate selectors and improper timing control of click operations:

1. Selector problem: querySelector selector may fail due to page structure changes. It is recommended to use the browser's developer tool (F12) to check the structure of the target element and use a more precise selector such as ID or more specific class name. Avoid using selectors that depend on element order (such as :nth-child() ) or absolute paths, as these are susceptible to page structure changes.

2. Clicking the order and timing of operation: Continuous clicking of the "Incentive" and "OK" buttons may cause the page to not be updated in time, thereby obtaining the wrong "Current Efficiency" value. You need to add a delay after clicking the "Motivation" button, and wait for the page to be updated before performing subsequent operations. It is recommended to use setTimeout or setInterval functions to control execution timing. The correct process should be: click "Motivation" -> Wait for page update -> Get value -> Calculate -> Enter results -> Click "OK".

Improvement suggestions

To improve script reliability and maintainability, it is recommended:

• Use a more precise selector: Find the unique identifier (ID) of the target element or a more specific class name as the selector through the developer tool.
• Add a waiting mechanism: After clicking the "Incentive" button, use setTimeout function to wait for a period of time to ensure that the page is updated before obtaining the "Current Efficiency" value. You can use loops and conditions to judge until the correct value is obtained.
• Error handling: Use try...catch block to capture potential errors, such as element not found or numerical parsing failure, etc.
• Logging: Add logging function to facilitate debugging and troubleshooting. Record the execution and results of key steps.
• Loop control: Use while loop and set the termination condition (the "current efficiency" reaches 100).
• Script Start/Stop Mechanism: Consider adding buttons or other mechanisms to control the start and stop of the script.

Through the above improvements, a more robust and reliable automated script can be created to effectively complete web element operations and numerical calculations. Remember, double-checking of page structure and tuning script logic is the key to solving such problems.

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