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Mostrar "buscar de nuevo" cuando el resultado esté vacío usando JavaScript

Creé un filtro de menú desplegable usando JavaScript.

Quiero mostrar "Buscar de nuevo" cuando el resultado esté vacío.

es decir, si el resultado devuelto es "nulo", entonces write.document("search again") .

¡Le agradezco que se tome el tiempo para ayudarme!


 <script> $("select.grade, select.type, select.subject").change(update); function update() { var resourceGrade = $('select.grade').val(); var resourceType = $('select.type').val(); var resourceSubject = $('select.subject').val(); $('.property-load-section') .find('.property-item') .hide() .filter(function() { var okResourceGrade = true; if (resourceGrade !== "all") { okResourceGrade = $(this).attr('data-grade') === resourceGrade; } var okResourceType = true; if (resourceType !== "all") { okResourceType = $(this).attr('data-type') === resourceType; } var okResourceSubject = true; if (resourceSubject !== "all") { okResourceSubject = $(this).attr('data-subject') === resourceSubject; } var result = okResourceGrade && okResourceType && okResourceSubject; if (result === null) { document.getElementById("searchagain").style.display = "block"; } return result; }) .fadeIn('fast'); } </script>
about 4 years ago · Juan Pablo Isaza
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