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40 lines
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1.4 KiB
Markdown
40 lines
No EOL
1.4 KiB
Markdown
---
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id: intentionally-fail-js-query
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title: Intentionally Throwing an Error in RunJS for Debugging
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---
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<div style={{paddingBottom:'24px'}}>
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In this step-by-step guide, we'll walk you through the process of creating a RunJS query that intentionally throws an error for debugging purposes.
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</div>
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<div style={{paddingTop:'24px', paddingBottom:'24px'}}>
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### Creating the Error-Throwing RunJS Query
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1. Create a new RunJS query by clicking the `+ Add` button on the query panel.
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2. Paste the following code into the RunJS query editor. This code utilizes the `ReferenceError` constructor to intentionally generate an error.
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```js
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throw new ReferenceError('This is a reference error.');
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```
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</div>
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<div style={{paddingTop:'24px', paddingBottom:'24px'}}>
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### Adding an Event Handler for Failure
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3. Now, enhance the query by adding an event handler that will display an alert when the query fails.
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4. Click the "Run" button to execute the query and observe the intentional error being thrown.
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Refer to the screencast below:
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<div style={{textAlign: 'center'}}>
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<img style={{ border:'0', marginBottom:'15px', borderRadius:'5px', boxShadow: '0px 1px 3px rgba(0, 0, 0, 0.2)' }} className="screenshot-full" src="/img/how-to/failjs/failjsn.gif" alt="reate a new RunJS query" />
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</div>
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</div>
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By following these steps, you can effectively simulate errors in your RunJS queries, aiding in the debugging process and improving the overall robustness of your code. |