Why is \'TypeError: $(...).modal is not a function\' Occurring with Bootstrap Modal and How Can It Be Fixed?

TypeError: $(...).modal is not a function with Bootstrap Modal

In an attempt to dynamically insert a Bootstrap modal into another view, a developer encountered the error "TypeError: $(...).modal is not a function." This error indicates that the jQuery function for manipulating modals is not being recognized.

The developer's code involves using the jQuery ajax function to load a separate partial view containing the modal HTML into a target div. However, even though the div containing the modal was correctly inserted, the modal() function was not working as expected.

The underlying issue in this case was the potential duplication of the jQuery library. When checking the page source, it was discovered that jQuery was being included twice, which can lead to conflicts and errors.

Resolution:

To resolve the issue, ensure that jQuery is only included once on the page. Typically, this is done by using a script tag to load the jQuery library from a CDN or from a locally stored version. Verifying that jQuery is not loaded multiple times will help prevent this type of error and ensure the correct functioning of jQuery functions, including the modal() function.

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