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finishing the school project


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How can I make the panel's text disappear when it is hiding and the text is displayed when the panel is showing? Thank you

 

 

I'm sorry for my English

 

 

<!DOCTYPE html>
 
<html>
<head>
<style>
#panel, #flip {
padding: 5px;
text-align: center;
background-color: #e5eecc;
border: solid 1px #c3c3c3;
-webkit-user-select:none;
-moz-user-select:none;
-ms-user-select:none;
-o-user-select:none;
user-select:none;
}
#panel {
padding: 50px;
display: none;
}
</style>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<script>
$(document).ready(function(){
$("#flip").click(function(e){
e.preventDefault();
$("#panel").stop();
$("#panel").slideToggle("slow");
mostrarFrases();
});
mostrarFrases();
});
</script>
<script>
var Frases=new Array()
Frases[0] = "Si en los inicios no puedes alimentar a tu equipo con 2 pizzas, es que es demasiado grande – Jeff Bezos de Amazon.";
Frases[1] = "El valor de una idea radica en el uso de la misma – Thomas Edison.";
Frases[2] = "El trabajo va a ocupar gran parte de tu vida. La única forma de estar realmente satisfecho es hacer aquello que crees que es un buen trabajo, y la única forma de hacer un gran trabajo es amar aquello que haces – Steve Jobs de Apple.";
Frases[3] = "Tus clientes más insatisfechos deben ser tu mayor fuente de aprendizaje – Bill Gates";
Frases[4] = "Una visión de una idea sin la capacidad de ejecución es únicamente una alucinación – Steve Case de AOL.";
var Q = Frases.length;
 
function mostrarFrases() {
var numAleatorio=Math.round(Math.random()*(Q-1));
document.getElementById("panel").innerHTML=Frases[numAleatorio];
}
</script>
</head>
<body>
<div id="flip">Click to slide the panel down or up</div>
<div id="panel">Hello world!</div>
</body>
</html>

 

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Use a 'complete' option as described here http://api.jquery.com/slidetoggle/ to run a anonymous function  that will trigger the random function AFTER the slide is complete. Then use if condition to check if element is visible before running it

if($("#panel").is(":visible")){

//run code
}

You can clear the panel using if condition using

if($("#panel").is(":hidden")){

//run code
}

To clear content ready for new when panel is closed and the next click event occurs.

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