JQuery verifies whether the jsp page attribute is empty (example code)_jquery

Note: The prerequisite for verifying whether it is empty must first ensure that it is verified before submitting the form. If the verification result contains empty items, the form cannot be submitted and a prompt is displayed. Verify the error message and verify that the form is submitted normally when the page attributes are not empty. This part belongs to the JS part and has basically nothing to do with the background business logic layer and control layer.

The method of limiting submissions can be to limit it in the form tag, or to add onclick event restrictions on the submit button:

Case:

Copy code The code is as follows:

Copy code The code is as follows:

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