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In laravel, the old () method is used to extract the information from session with the syntax "value=" {{old ('name')}} "; when the form submission fails, laravel will flash the data entered by the user into an one-time session, and old can retrieve the flash data from it.

This article operating environment: Windows10 system, Laravel6 version, Dell G3 computer.

How to use old method in laravel

Because error messages flash into session, the old function fetches the information from session

Value= "{{old ('name')}}"

When a user fails to submit a form, laravel automatically flash the user's input data into an one-time session (this data will be lost as soon as it is refreshed, so it is called one-time data). Then old ('name') can take out the flash data in the session and avoid letting the user re-enter it.

Using old (), you can take the last submitted data from the one-time session and hang it on the DOM element, thus preventing the user from re-entering it.

Examples are as follows:

The traditional submission form page will be refreshed and the contents of the input box will be lost. Laravel

Better user experience solution withInput () + old () session

Laravel automatically stores the data entered by the user into an one-time session. Function

Using old (), you can take the last submitted data from the one-time session and hang it on the DOM element, thus avoiding the user's new input. Input

Using withInput (), in conjunction with the with method, you can write the parameters you want to return to session. The blade template can extract the value from the session to make some logical judgments. It

Return redirect ()-> back ()-> withInput ()-> with (['error'= >' failed to register, incorrect SMS verification code', 'page'= >' phone'])

Blade template old () assignment function written as io

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