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help me on arrays-dodgy

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Feb 05.2009

I’m not a novice so I don’t need tutorial. All I want to know is (based on the code below), how would I add the inputs(in for loop) to the candidateArray elements (e.g. input of 70 for first prompt would result in 300).ANY HELP WOULD BE MOST APPRECIATIVE

var totalMembership;
var totalVotes;
var candidateArray = new Array(230, 341, 196, 81, 257);
totalMembership = window.prompt (‘Please enter the number of members’, ”);
totalMembership = parseFloat(totalMembership);
totalVotes = 0;

for(var i = 0; i < candidateArray.length; i = i + 1) //a simple counter loop
{
candidateArray[i] = window.prompt(‘enter votes cast for candidate ‘ + (i + 1), ”);
}

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JavaScript

4 Comments(s) ↴

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@toicontienFeb 05.2009 — The window.prompt method returns a string when the user enters something, or null if the user enters nothing. You should also check that the number entered is a valid number. Try this code below:
[code=php]var totalMembership = 0;
var totalVotes = 0;
var candidateArray = [230, 341, 196, 81, 257];
var candidateLen = candidateArray.length;

function calcVotes() {
var i = 0;
var votes = 0;

totalMembership = promptValidNumber("Please enter the number of members", "",
"Please enter a valid number of members");

for(i; i < candidateLen; i++) {
votes = promptValidNumber("enter votes cast for candidate " + (i+1), "",
"Please enter a valid number of votes.");
candidateArray[i] += votes;
}
}

function promptValidNumber(promptStr, promptVal, errorStr) {
var n = null;

promptVal = promptVal || "";
errorStr = errorStr || "Please enter a valid number.";

while ( isNaN(n = Number(prompt(promptStr, promptVal))) ) {
alert(errorStr);
}

return n;
}[/code]
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@saintxxauthorFeb 05.2009 — This code needs to be without functions, and I only want to know what is wrong with it and maybe 1 or two lines corrected.

I want to add what i type in the prompt to each element, so for example, 70 in the first prompt would make the first element in the array 300.


*****NO FUNCTIONS*****


var totalMembership;

var totalVotes = 0;

var candidateArray = [230, 341, 196, 81, 257];

var votes = 0;


totalMembership = window.prompt('Please enter the number of members', '');

for(var i = 0; i < candidateArray.length; i = i + 1)

{

var votes = window.prompt('enter votes cast for candidate ' + (i + 1), '');

votes = parseFloat(votes);

}

document.write(candidateArray[i] + '<BR>');
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@toicontienFeb 05.2009 — Sounds like a class project?
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@JMRKERFeb 05.2009 — 
  • 1. You need to MOVE the last '}' character to the VERY last line as it

    does not include the display inside the loop.

  • 2. You need to add the prompted input to the current contents of the

    candidateArray if you want to see 230+70 to equal 300, otherwise only

    original value will be displayed.

  • 3. Finally with your statement *****NO FUNCTIONS*****
    [/QUOTE]     you violate your original code with the use of

    a. window.prompt()

    b. parseFloat()

    c. document.write()

    Each of which is a function.
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