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docs: update undefined not iterable article #1713

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0be62c7
docs: address dotnet 6 deprecation issues
petar-i-todorov Jun 12, 2025
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docs: update undefined not iterable article
petar-i-todorov Jun 13, 2025
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revert changes
petar-i-todorov Jun 13, 2025
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petar-i-todorov Jun 13, 2025
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Update knowledge-base/telerik-reportviewer-typeerror-undefined-is-not…
petar-i-todorov Jun 16, 2025
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docs: make it more technically accurate
petar-i-todorov Jun 16, 2025
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8 changes: 4 additions & 4 deletions knowledge-base/telerik-reportviewer-typeerror-undefined-is-not-iterable.md
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---
title: TypeError undefined is not iterable in Telerik ReportViewer
description: Resolving the 'TypeError undefined is not iterable' error when previewing a report with Telerik ReportViewer.
title: TypeError undefined is not iterable in HTML5-based report viewers
description: Learn how to resolve the 'TypeError undefined is not iterable' error when previewing a report in HTML5-based report viewers.
type: troubleshooting
page_title: Fix TypeError undefined is not iterable in HTML5-based report viewer
slug: telerik-reportviewer-typeerror-undefined-is-not-iterable
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## Cause

This issue occurs due to a breaking change in the latest version, where the report viewer is no longer fully initialized immediately after the `$("#reportViewer1").telerik_ReportViewer` call. As a result, subsequent calls like `reportViewer.reportSource()` immediately after initialization do not behave as expected.
This issue occurs due to a breaking change in the 19.1.25.521 version, where the report viewer is no longer fully initialized immediately after the `$("#reportViewer1").telerik_ReportViewer` call. As a result, subsequent calls like `reportViewer.reportSource()` will fail because the viewer instance is not yet ready.

## Solution

Use the `ready` event to ensure the report viewer is fully initialized before setting the report source. For example, in the HTML5 report viewer, this would look as follows:
Place logic that relies on the report viewer being fully initialized, such as the `reportViewer.reportSource()` calls, inside the `ready` event handler instead. For example, in the [HTML5 report viewer]({%slug telerikreporting/using-reports-in-applications/display-reports-in-applications/web-application/html5-report-viewer/overview%}), this would look as follows:

````javascript
$("#reportViewer1")
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