Greetings,

I use Dreamweaver for my code and sometimes what I do is use some of their behaviors and then modify them to suit my needs. Using one of their behaviors generated the following code...

function goNext() {
  var currPage, i
  for (i=0; i<=(quiz.length-1); i++) {
    if (parent.main.location.href.indexOf(quiz[i].src) != -1) {
      parent.main.location.href = quiz[i+1].src
      break
    }

My question is this...what does the "i" do/mean here? Can anyone enlighten me?

Clay Hess

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Clay Hess

The i in this example is an index variable used inside the loop.

This code loops while i is less than or equals to the number of quiz items. It does this by giving i a starting value of 0. Then the code between the brackets will run. On the next iteration, i is incremented by one (i++). If i is still less than or equal to quiz.length-1, the code will continue.

So, imagine the quiz had 4 questions, the code would loop for i = 0, 1, 2 and 3.

Inside the loop, you can then use i to retrieve a specific item, usually related to the value of i, as in this example:

quiz[i+1].src

In this example, the ith + 1 item is retrieved from the array with quiz questions.

Does this help?

Imar
---------------------------------------
Imar Spaanjaars
Everyone is unique, except for me.

Imar,

THanks...yes that does make sense. Now maybe you can answer another question for me. Here is the quiz array...

var quiz = new Array()

quiz[0] = new quizPage("al_home.htm")
quiz[1] = new quizPage("al_q1.htm")
quiz[2] = new quizPage("al_q2.htm")
quiz[3] = new quizPage("al_q3.htm")
quiz[4] = new quizPage("al_q4.htm")
quiz[5] = new quizPage("al_q5.htm")
quiz[6] = new quizPage("al_q6.htm")
quiz[7] = new quizPage("al_q7.htm")
quiz = new quizPage("al_q8.htm")
quiz[9] = new quizPage("al_q9.htm")
quiz[10] = new quizPage("al_q10.htm")
quiz[11] = new quizPage("al_sum.htm")
quiz[12] = new quizPage("al_home.htm")

Now looking at this array and the code in my previous post. Why would parent.main.location.href be undefined once I get to the al_sum.htm page?

Clay Hess

To be honest, I don't know. What is quizPage for a thing? How does the rest of the code look like?

Imar
---------------------------------------
Imar Spaanjaars
Everyone is unique, except for me.

Here is the quizpage object code...

// constructor for a quiz page object
function quizPage(src,time, timeLimit, tries, score, completed) {
  this.src = src
  this.time = (!time) ? 0 : time
  this.timeLimit = (!timeLimit) ? 0 : timeLimit
  this.tries = (!tries) ? 0 : tries
  this.score = (!score) ? 0 : score
  this.completed = (!completed) ? false : completed
}

Clay Hess

Imar,

I got it to work by changing..

function goNext() {
  var currPage, i
  for (i=0; i<=(quiz.length-1); i++) {
    if (parent.main.location.href.indexOf(quiz[i].src) != -1) {
      parent.main.location.href = quiz[i+1].src
      break
    }

to the following..

function goNext() {
  var currPage, i
  for (i=0; i<=(quiz.length-1); i++) {
    if (parent.main.document.location.href.indexOf(quiz[i].src) != -1) {
      parent.main.document.location.href = quiz[i+1].src
      break
    }

Now I like to know the whys behind something. Why would the reference to the document make the difference?

Clay Hess

I think your loop loops too many times. Take a look at this:

for (i=0; i<=(quiz.length-1); i++) {
...
      parent.main.document.location.href = quiz[i+1].src


quiz.length will return 13 (items from 0 to 12, so the code will loop for i = 0 to i = 12.

The last line tries to retrieve item i + 1, which will result in 12 + 1 for the last item in the quiz array.
Item 13 does not exist in the array, because the last item is number 12.

Cheers,

Imar
---------------------------------------
Imar Spaanjaars
Everyone is unique, except for me.