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Скачать или смотреть Troubleshooting Conflicting Scripts in .NET: Why Only One JavaScript Runs at a Time

  • vlogize
  • 2025-08-15
  • 0
Troubleshooting Conflicting Scripts in .NET: Why Only One JavaScript Runs at a Time
Two scripts refuse to run togetherjavascripthtmljqueryasp.net core
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Описание к видео Troubleshooting Conflicting Scripts in .NET: Why Only One JavaScript Runs at a Time

Having both scripts in a .NET project? Find out why only the last script runs and learn how to easily solve this issue.
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This video is based on the question https://stackoverflow.com/q/67781852/ asked by the user 'UgKnu' ( https://stackoverflow.com/u/16069747/ ) and on the answer https://stackoverflow.com/a/67785909/ provided by the user 'UgKnu' ( https://stackoverflow.com/u/16069747/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

Visit these links for original content and any more details, such as alternate solutions, latest updates/developments on topic, comments, revision history etc. For example, the original title of the Question was: Two scripts refuse to run together

Also, Content (except music) licensed under CC BY-SA https://meta.stackexchange.com/help/l...
The original Question post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license, and the original Answer post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license.

If anything seems off to you, please feel free to write me at vlogize [AT] gmail [DOT] com.
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Troubleshooting Conflicting Scripts in .NET

As a web developer, you may encounter strange issues where two scripts refuse to work together. This common problem can be quite frustrating, leading to hours of debugging. Today, we'll explore a specific case where two JavaScript files in a .NET environment caused conflicts, and provide insights on how to resolve it effectively.

The Scenario

Imagine you are working on a .cshtml file for an ASP.NET application, and you need to implement functionalities using two scripts: one for clicking an icon (star.js) and another for displaying a map (mapdisplay.js). Surprisingly, you find that only one of the scripts runs while the other remains dormant. Specifically, when included, only the last script loaded in the file executes correctly.

Here’s a snippet of the structure that caused the issue:

[[See Video to Reveal this Text or Code Snippet]]

Understanding the Problem

The clash arises primarily from how JavaScript handles the window.onload event:

window.onload can only be assigned to one function. When you declare multiple window.onload functions, only the last one gets executed, which is the root cause of the issue you're facing.

In your case:

Both star.js and mapdisplay.js are trying to use window.onload, which leads to one script overriding the other.

The Solution

Use window.addEventListener

The solution is straightforward! Instead of assigning the function to window.onload, you can use window.addEventListener:

Modify your existing scripts to use addEventListener. Here's how:

In star.js, replace:

[[See Video to Reveal this Text or Code Snippet]]

With:

[[See Video to Reveal this Text or Code Snippet]]

Do the same for mapdisplay.js as well.

Updated example for star.js:

[[See Video to Reveal this Text or Code Snippet]]

Updated example for mapdisplay.js:

[[See Video to Reveal this Text or Code Snippet]]

Benefits

Compatibility: addEventListener allows multiple events to be registered for the same event type, thus enabling both scripts to run successfully without interference.

Better practice: Using addEventListener is considered a more modern approach to handle events in JavaScript.

Conclusion

By simply switching from window.onload to window.addEventListener, you can solve the issue of conflicting scripts and enable both functionalities to coexist peacefully in your ASP.NET application. This not only solves the immediate problem but also enhances the overall maintainability of your code.

Remember, as you work with JavaScript in various environments, it’s crucial to understand how event handling works. If you ever find yourself in a similar situation, this fix should save you valuable time and frustration.

Keep coding and happy debugging!

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