How to have one-time push in laravel blade

One solution is to extend Blade by creating a pushonce directive as follows:

Blade::directive('pushonce', function ($expression) {

    $isDisplayed = '$__pushonce_'.trim(substr($expression, 2, -2));

    return "<?php if(!isset({$isDisplayed})): {$isDisplayed} = true; \$__env->startPush{$expression}; ?>";
});

Blade::directive('endpushonce', function ($expression) {

    return '<?php $__env->stopPush(); endif; ?>';
});

It must be added to AppServiceProvider boot method.

Usage:

@pushonce('scripts')
   <script src="{{ asset('js/foo.js') }}"></script>
   <script>
   ...
   </script>
@endpushonce

@pushonce('styles')
   <script src="{{ asset('js/foo.js') }}"></script>
   <script>
   ...
   </script>
@endpushonce

Please test it and let me know if that's help.

This Works for me.

@once
    @push('page_scripts')
        <script type="text/javascript">
           
        </script>
    @endpush
@endonce

As of Laravel 7.25, Blade now includes a new @once component that will only render the items within the tags one time. https://laravel.com/docs/8.x/blade#the-once-directive

In the following answer I assumed you are familiar with Blade extension. This method has been tested on Laravel 5.2 and 5.3 (See note below).

After testing Ismail RBOUH's Answer (so please read it), It seems there are two problems with the solution:

1- The $isDisplayed variable is not in a same scope with the other included widgets so each @include push its scripts to stack. As a result I change it to:

Blade::directive('pushonce', function ($expression) {
    $isDisplayed = '__pushonce_'.trim(substr($expression, 2, -2));
    return "<?php if(!isset(\$__env->{$isDisplayed})): \$__env->{$isDisplayed} = true; \$__env->startPush{$expression}; ?>";
});
Blade::directive('endpushonce', function ($expression) {
    return '<?php $__env->stopPush(); endif; ?>';
});

2- The solution limit the use of @pushonce to one widget. i.e. in the case of 2 or more widgets (widget1.blade.php, widget2.blade.php, ...) it prevent to push other widgets scripts. So, I add domain to @pushonce with the following code:

Blade::directive('pushonce', function ($expression) {
    $domain = explode(':', trim(substr($expression, 2, -2)));
    $push_name = $domain[0];
    $push_sub = $domain[1];
    $isDisplayed = '__pushonce_'.$push_name.'_'.$push_sub;
    return "<?php if(!isset(\$__env->{$isDisplayed})): \$__env->{$isDisplayed} = true; \$__env->startPush('{$push_name}'); ?>";
});
Blade::directive('endpushonce', function ($expression) {
    return '<?php $__env->stopPush(); endif; ?>';
});

Usage:

widget1.blade.php

@pushonce('scripts:widget1')
   <script src="{{ asset('js/foo.js') }}"></script>
   <script>
   ...
   </script>
@endpushonce

widget2.blade.php

@pushonce('scripts:widget2')
   <script src="{{ asset('js/bar.js') }}"></script>
   <script>
   ...
   </script>
@endpushonce

NOTE FOR L 5.3: change the following line:

$domain = explode(':', trim(substr($expression, 2, -2)));

to

$domain = explode(':', trim(substr($expression, 1, -1)));