Javascript: Random Element From Array, Do While -

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i have button displays quote , author array. need button display new quote/author each time button clicked. no 2 same quotes/authors in row!

window.onload = function() {     //assign var quotetext id contents     var quotespan = document.getelementbyid("quotetext");      //assign var authortext id contents     var authorspan = document.getelementbyid("authortext");      var oldquoteindex = -1;     var submitbutton = document.getelementbyid('submit');      var quotes = [         {'text': 'i milk!', 'author': '-biff'},          {'text': 'milk nasty.', 'author': '-jonn'},          {'text': 'what mean?', 'author': '-jay'},          {'text': 'milk. mmm.', 'author': '-don'},          {'text': 'milk bad.', 'author': '-denny'}     ];        //function determining random quote     function nextquote() {                  {             //picks random quote quotes arraw             var newquoteindex = math.floor(math.random() * quotes.length);          } while (newquoteindex == oldquoteindex); //while index of newly chosen quote same index of old quote         quotespan.innerhtml = quotes[newquoteindex].text; //while html's quotetext has random quote         authorspan.innerhtml = quotes[newquoteindex].author; //while html's authortext has random author         var oldquoteindex = newquoteindex; //while old index same new index     }      //when button clicked, quotation function starts     submitbutton.onclick = nextquote;  }

why deal picked?

just remove after use it.

basic example:

var orgarr = [0,1,2,3,4,5]; var rand = orgarr.slice(0)          //make copy of original     .sort(function (){              //sort array           return math.random() > .5; // basic shuffle function     });  while (rand.length) {               //just looping show items being removed     var randomitem = rand.pop();    //get next random item , remove      console.log(randomitem);       //display }

in case when click happens, popping.


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