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Thread: I need basic help

  1. #1
    Join Date
    Oct 2012
    Posts
    9

    I need basic help

    Hey guys

    I have a basic js code for some alerts and need to make an alert for showing age calculated from dob.

    I have 1 already set up to show dob and now need to show the other 1 for age .

    Heres my code:

    var dob = document.getElementById("dob");
    dob.oninput = function(){
    alert("your date of birth is: " + dob.value)
    daysOld(dob);
    };

    function daysOld(dob){
    var msPerDay = 1000 * 60 * 60 * 24,
    now = new Date(),
    diff = now - dob;
    alert("age is " + diff)
    return diff/msPerDay;
    };


    Any help would be much appreciated

  2. #2
    Join Date
    Nov 2002
    Location
    Flint, Michigan, USA
    Posts
    588
    Maybe this will help:
    Code:
    function daysOld(dob){
    msPerDay=1000*24*60*50;
    var Birth=new Date(dob)*1;  // birth date in milliseconds since 1-1-1970
    now = new Date()*1;
    diff = now - Birth;
    alert("age is " + diff + "milliseconds")
    return diff/msPerDay;
    };
    Age=daysOld('March 11, 1949');
    alert(Age);

  3. #3
    Join Date
    Oct 2012
    Posts
    9
    thanks for your help but this still didn't work. age is being displayed at undefined

  4. #4
    Join Date
    Nov 2002
    Location
    Flint, Michigan, USA
    Posts
    588
    Please post what you have so far.

  5. #5
    Join Date
    Oct 2012
    Posts
    9
    window.onload = function(){
    var para = document.getElementById("heading");
    para.innerText = "A short exercise on creating dynamic web content.";

    var button = document.getElementById("button"); // get the button element
    button.onclick = function(){ // Attach a function to it
    alert("I've been clicked");
    };
    var list = document.getElementById("list");
    list.onchange = function(){
    var item = list.options[list.selectedIndex].text; // This code extracts the text
    changeColour(item); // from the selected item in
    };
    // list (at the .onchange event)
    var dob = document.getElementById("dob");
    dob.oninput = function(){
    alert("your date of birth is: " + dob.value);
    daysOld(dob);
    };


    var range = document.getElementById("range");
    var value = document.getElementById("value");
    range.onchange = function () {
    value.innerText = range.value;
    };



    function daysOld(age){
    var msPerDay = 1000 * 60 * 60 * 24,
    now = new Date(),
    diff = now - dob;
    alert("You are:" + diff);
    return diff/msPerDay;
    }

    function changeColour(colour){
    var c = 0;
    switch(colour){
    case "Red":
    c = "#f00";
    break;
    case "Green":
    c = "#0f0";
    break;
    case "Blue":
    c = "#00f";
    break;
    }
    document.bgColor = c;


    }
    };

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