Populating dynamic html elements on validation failure in Laravel 5.1 - php

Question

In my form, I am populating state and city dropdowns using ajax.
Also, on the same form the user can add multiple employees by clicking on the "Add more button".
In both above scenarios the HTML DOM elements are generated using jquery.
I need re-build the dynamically generated elements in case the validation fails on form submit.
Can anyone please tell me a right approach for achieving the above mentioned issue.
Thanks.

Answer 1

Say you've generated a list of inputs dynamically by calling a js function, maybe something like
//JS
function generate(){
$("#container-abc").append("<input name=name[]>");
}
<!--HTML -->
<input name=name[] />
<input name=name[] />
Submit them and if there's validation error you will get back the values using:
//in your blade
$name = Request::old('name');
#if(count($name) > 0)
for (var i = 1; i <= {{count($name)}}; i++) {
generate();
}
#endif

Answer 2

you can use
return Redirect::back()->withInput();
or for more info visit https://laravel.com/docs/5.2/requests#old-input
Old Input
Laravel allows you to keep input from one request during the next
request. This feature is particularly useful for re-populating forms
after detecting validation errors. However, if you are using Laravel's
included validation services, it is unlikely you will need to manually
use these methods, as some of Laravel's built-in validation facilities
will call them automatically. Flashing Input To The Session
The flash method on the Illuminate\Http\Request instance will flash
the current input to the session so that it is available during the
user's next request to the application:
$request->flash();
You may also use the flashOnly and flashExcept methods to flash a
sub-set of the request data into the session:
$request->flashOnly(['username', 'email']);
$request->flashExcept('password');
Flash Input Into Session Then Redirect
Since you often will want to flash input in association with a
redirect to the previous page, you may easily chain input flashing
onto a redirect using the withInput method:
return redirect('form')->withInput();
return redirect('form')->withInput($request->except('password'));
Retrieving Old Data
To retrieve flashed input from the previous request, use the old
method on the Request instance. The old method provides a convenient
helper for pulling the flashed input data out of the session:
$username = $request->old('username');
Laravel also provides a global old helper function. If you are
displaying old input within a Blade template, it is more convenient to
use the old helper. If no old input exists for the given string, null
will be returned: