We Keep Coding

Change range element's step depending on it's value

Right now I have this range element:
<input type="range"
onchange= "calculate();"
id="sumRange"
min="50000"
max="500000"
value="50000"
step= "50000"/>
I want its "step" to change depending on its value. For example, if the value is less than 200000 then step = 5000, if more than 200000 then step= 50000.
How can I do that? Do I create a function with simple "if" statements and make it run onchange of the range?
All example i've seen involve jQuery or something else, can i do this without...that?

See below, change the ranges as needed
function calculate() {
var input = document.getElementById('sumRange');
var val = input.value;
var newStep;
if (val < 100000) {
newStep = 10;
} else if (val < 150000) {
newStep = 20;
} else if (val < 200000) {
newStep = 30;
} else if (val < 250000) {
newStep = 40;
} else {
newStep = 50;
}
input.step = newStep;
}
<input type="range"
onchange= "calculate();"
id="sumRange"
min="50000"
max="500000"
value="50000"
step= "50000"/>

here is what you can do in your calculate function, using jquery
calculate = function() {
if ($('#sumRange').attr('value') < 200000 ) {
$('#sumRange').attr('step',5000);
} else {
$('#sumRange').attr('step',50000);
}

var sumRange = document.getElementById(“sumRange”);
sumRange.oninput = function(){
var value = this.value;
if (value > 20000) {
this.step = 50000;
} else {
this.step=5000;
}

Updating interval dynamically - jQuery or Javascript

I have two "stopwatches" in my code (and I may be adding more). This is the code I currently use below - and it works fine. But I'd really like to put the bulk of that code into a function so I'm not repeating the same code over and over.
When I tried doing it though, I could get it working - I think it was because I was passing stopwatchTimerId and stopwatch2TimerId into the function and it may have been passing by reference?
How can I reduce the amount of code repetition here?
var stopwatchTimerId = 0;
var stopwatch2TimerId = 0;
$('#stopwatch').click(function () {
if ($(this).hasClass('active')) {
$(this).removeClass('active');
clearInterval(stopwatchTimerId);
}
else {
$(this).addClass('active');
stopwatchTimerId = setInterval(function () {
var currentValue = parseInt($('#stopwatch-seconds').val()) || 0;
$('#stopwatch-seconds').val(currentValue + 1).change();
}, 1000);
}
});
$('#stopwatch2').click(function () {
if ($(this).hasClass('active')) {
$(this).removeClass('active');
clearInterval(stopwatch2TimerId);
}
else {
$(this).addClass('active');
stopwatch2TimerId = setInterval(function () {
var currentValue = parseInt($('#stopwatch2-seconds').val()) || 0;
$('#stopwatch2-seconds').val(currentValue + 1).change();
}, 1000);
}
});
As you can see, it's basically the same code in each except for stopwatchTimerId and $('#stopwatch-seconds') (and the same vars with 2 on it for the other one).

This won't pollute global scope and also you don't need to do any if-else statements. Just add data-selector to your new elements :)
<input id="stopwatch" type="text" data-selector="#stopwatch-seconds"/>
<input id="stopwatch2" type"text" data-selector="#stopwatch2-seconds"/>
$('#stopwatch stopwatch2').click(function () {
var $element = $(this),
interval = $element.data('interval');
selector = $element.data('selector');;
if ($element.hasClass('active')) {
$element.removeClass('active');
if (interval) {
clearInterval(interval);
}
}
else {
$element.addClass('active');
$element.data('interval', setInterval(function () {
var currentValue = parseInt($(selector).val()) || 0;
$(selector).val(currentValue + 1).change();
}, 1000));
}
});

function stopwatch(id){
$('#' + id).click(function () {
if ($(this).hasClass('active')) {
$(this).removeClass('active');
clearInterval(window[id]);
}
else {
$(this).addClass('active');
window[id] = setInterval(function () {
var currentValue = parseInt($('#' + id + '-seconds').val()) || 0;
$('#' + id + '-seconds').val(currentValue + 1).change();
}, 1000);
}
});
}
$(function(){
stopwatch("stopwatch");
stopwatch("stopwatch2");
});

You could do something like this (code is not very nice, you can improve it):
var stopwatchTimerId;
$('#stopwatch').click(function () {
doStopWatch(1);
});
$('#stopwatch2').click(function () {
doStopWatch(2);
});
var doStopWatch = function(option){
var stopWatch = option===1?$('#stopwatch'):$('#stopwatch2');
if (stopWatch.hasClass('active')) {
stopWatch.removeClass('active');
clearInterval(stopwatchTimerId);
}
else {
stopWatch.addClass('active');
stopwatchTimerId = setInterval(function () {
var currentValue = option===1?(parseInt($('#stopwatch-seconds').val()) || 0):(parseInt($('#stopwatch2-seconds').val()) || 0);
if(option===1)
$('#stopwatch-seconds').val(currentValue + 1).change();
else
$('#stopwatch2-seconds').val(currentValue + 1).change();
}, 1000);
}
}

Try
var arr = $.map($("div[id^=stopwatch]"), function(el, index) {
el.onclick = watch;
return 0
});
function watch(e) {
var id = this.id;
var n = Number(id.split(/-/)[1]);
if ($(this).hasClass("active")) {
$(this).removeClass("active");
clearInterval(arr[n]);
} else {
$(this).addClass("active");
arr[n] = setInterval(function() {
var currentValue = parseInt($("#" + id + "-seconds").val()) || 0;
$("#" + id + "-seconds").val(currentValue + 1).change();
}, 1000);
}
};
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js">
</script>
<div id="stopwatch-0">stopwatch1</div>
<input type="text" id="stopwatch-0-seconds" />
<div id="stopwatch-1">stopwatch2</div>
<input type="text" id="stopwatch-1-seconds" />

Undefined index after running function a few times

So I was trying to create my own Blackjack in javascript for learning purposes and even though the code is overall working, I came across a weird bug.
After some clicks on the Deal html button, which calls the function deal(), I will get either a playerHand[i] undefined or dealerHand[i] undefined error on line 114 or 118, respectively, of the code posted below.
I noticed this also happened if I clicked the button very fast for whatever reason.
I suspected it had something to do with memory optimization so I used the delete command to reset those arrays between game turns, but the error persists.
So, why do my arrays break after some use?
Thanks.
JS:
var deck = [];
var dealerHand = [];
var playerHand = [];
var dscore = 0;
var pscore = 0;
var turn = 0;
function Card(suit, src) {
this.src = src;
this.suit = getSuit(suit);
this.value = getValue(src);
};
function getSuit(suit) {
if (suit == 1) return "Clubs";
if (suit == 2) return "Diamonds";
if (suit == 3) return "Hearts";
if (suit == 4) return "Spades";
};
function getValue(src) {
if (src == 1) return 11;
if (src < 10) return src;
else return 10;
};
function createDeck() {
for (i=1; i<=4; i++) {
for(j=1; j<=13; j++) {
var card = new Card(i, j);
deck.push(card);
};
};
};
function getCard() {
var rand = Math.floor(Math.random()*deck.length);
deck.splice(rand,1);
return deck[rand];
};
function deal() {
if(turn == 0) {
dealerHand.push(getCard());
playerHand.push(getCard());
};
dealerHand.push(getCard());
playerHand.push(getCard());
};
function stand() {
dealerHand.push(getCard());
};
function clearBoard () {
$('#player').html("");
$('#dealer').html("");
};
function resetDeck () {
delete deck;
deck = [];
};
function resetHands () {
delete dealerHand;
delete playerHand;
dealerHand = [];
playerHand = [];
};
function resetScore () {
pscore = 0;
dscore = 0;
};
function isAce (arr) {
for(i=0; i<arr.length; i++) {
if (arr[i].src == 1) return true;
else return false;
};
}
function updateScore() {
resetScore();
if (playerHand.length > 0 && dealerHand.length > 0) {
for(i=0; i<playerHand.length; i++) {
pscore += playerHand[i].value;
};
for(i=0; i<dealerHand.length; i++) {
dscore += dealerHand[i].value;
};
//Regra do Às
if(pscore > 21 && isAce(playerHand)) {
pscore -= 10;
};
if(dscore > 21 && isAce(dealerHand)) {
dscore -= 10;
};
} else {
pscore = 0;
dscore = 0;
};
};
function showScore () {
$('#pscore').html("<p>Player Score: " + pscore + "</p>");
$('#dscore').html("<p>Dealer Score: " + dscore + "</p>");
};
function showCards () {
for(i=0; i<playerHand.length; i++) {
var div = $("<div>");
var img = $("<img>");
img.attr('src', 'img/cards/' + playerHand[i].suit + '/' + playerHand[i].src + '.png');
div.append(img);
$('#player').append(div);
};
for(i=0; i<dealerHand.length; i++) {
var div = $("<div>");
var img = $("<img>");
img.attr('src', 'img/cards/' + dealerHand[i].suit + '/' + dealerHand[i].src + '.png');
div.append(img);
$('#dealer').append(div);
};
};
function cleanUp () {
if (pscore == 21) {
alert("Blackjack!");
newGame();
};
if (pscore > 21) {
alert("Bust!");
newGame();
};
if (dscore == 21) {
alert("You lost!");
newGame();
};
if (dscore > 21) {
alert("You won!");
newGame();
};
};
function newGame () {
turn = 0;
clearBoard();
resetHands();
resetScore();
showScore();
resetDeck();
createDeck();
};
function gameTurn () {
clearBoard();
updateScore();
showCards();
showScore();
cleanUp();
turn++;
};
$(document).ready(function() {
newGame();
$('#deal').on('click', function(){
deal();
gameTurn();
});
$('#stand').on('click', function(){
stand();
gameTurn();
});
});
CSS:
body {
background: url(../img/greenbg.png);
}
.holder {
width:800px;
margin:auto;
}
.clearfix {
clear:both;
}
#pscore, #dscore {
color: white;
margin: 10px;
display: block;
font-size: 1.2rem;
text-shadow: 0 0 5px #000;
}
.container {
width: 600px;
height: 300px;
margin: 10px;
}
div img {
float: left;
margin: 10px;
}
div button {
margin: 10px;
}
HTML:
<html>
<head>
<div class="holder clearfix">
<div id="dscore"><p>Dealer Score: 0</p>
</div>
<div id="dealer" class="container">
</div>
<div id="pscore"><p>Player Score: 0</p>
</div>
<div id="player" class="container">
</div>
<div class="">
<button id="deal">Deal</button>
<button id="stand">Stand</button>
</div>
</div>
</body>
</html>

You have a problem in this function, which may be to blame:
function getCard() {
var rand = Math.floor(Math.random()*deck.length);
deck.splice(rand,1);
return deck[rand];
};
As written, it's removing a card, and then returning the card that now has that position in the deck. If rand was the last element in the array then there is no longer a card in that position, so it'll return undefined.
You should be returning the value of the removed card itself, part of the result of the splice call:
function getCard() {
var rand = Math.floor(Math.random() * deck.length);
var pick = deck.splice(rand, 1);
return pick[0];
};
p.s. it's worth learning modern ES5 utility functions for arrays. For example, your isAce function could be rewritten thus, avoiding the bug where you always return after testing the first element:
function isAce(arr) {
return arr.some(function(n) {
return n === 1;
});
};
or, more cleanly:
function isAce(card) {
return card === 1; // test a single card
};
function holdsAce(hand) {
return hand.some(isAce); // test an array (or hand) of cards
};

Js and Divs, (even <div> is difference)

I Have find a javascript code that works perfectly for showing a DIV.
but this code works only for showing one div for each page.
i want to include many DIVS for hiding and showing in the same page.
I was try to replace the div id and show/hide span id with a rundom php number for each include, but still is not working.
so how i have to do it?
the JS code:
var done = true,
fading_div = document.getElementById('fading_div'),
fade_in_button = document.getElementById('fade_in'),
fade_out_button = document.getElementById('fade_out');
function function_opacity(opacity_value) {
fading_div.style.opacity = opacity_value / 100;
fading_div.style.filter = 'alpha(opacity=' + opacity_value + ')';
}
function function_fade_out(opacity_value) {
function_opacity(opacity_value);
if (opacity_value == 1) {
fading_div.style.display = 'none';
done = true;
}
}
function function_fade_in(opacity_value) {
function_opacity(opacity_value);
if (opacity_value == 1) {
fading_div.style.display = 'block';
}
if (opacity_value == 100) {
done = true;
}
}
// fade in button
fade_in_button.onclick = function () {
if (done && fading_div.style.opacity !== '1') {
done = false;
for (var i = 1; i <= 100; i++) {
setTimeout((function (x) {
return function () {
function_fade_in(x)
};
})(i), i * 10);
}
}
};
// fade out button
fade_out_button.onclick = function () {
if (done && fading_div.style.opacity !== '0') {
done = false;
for (var i = 1; i <= 100; i++) {
setTimeout((function (x) {
return function () {
function_fade_out(x)
};
})(100 - i), i * 10);
}
}
};

Check out the Fiddle, you can edit code based on your needs ;)
$(function() {
$('.sub-nav li a').each(function() {
$(this).click(function() {
var category = $(this).data('cat');
$('.'+category).addClass('active').siblings('div').removeClass('active');
});
});
});

finaly i found my self:
<a class="showhide">AAA</a>
<div>show me / hide me</div>
<a class="showhide">BBB</a>
<div>show me / hide me</div>
js
$('.showhide').click(function(e) {
$(this).next().slideToggle();
e.preventDefault(); // Stop navigation
});
$('div').hide();
Am just posting this in case someone was trying to answer.

Javascript Focus() function not working

I have a textbox which I want to set the focus on, but it doesn't work.
document.getElementById("txtCity").focus();
Any idea?

Maybe you are calling the JavaScript before the input element is rendered? Position the input element before the JavaScript or wait until the page is loaded before you trigger your JavaScript.
In that order, it works just fine:
<input type="text" id="test" />
<script type="text/javascript">
document.getElementById("test").focus();
</script>
In jQuery you could place your code within the .ready() method to execute your code first when the DOM is fully loaded:
<script type="text/javascript" src="jquery.min.js"></script>
<script type="text/javascript">
$(document).ready(function () {
$("#test").focus();
// document.getElementById("test").focus();
});
</script>

In case someone searching has a similar situation to mine ... I had to set a tabindex attribute before my div could receive focus():
featured.setAttribute('tabindex', '0');
featured.focus();
console.log(document.activeElement===featured); // true
(I found my answer here: Make div element receive focus )
And of course, make sure the body element is ready before setting focus to a child element.

I have also faced same problem.To resolve this problem, put your code in setTimeout function.
function showMeOnClick() {
// Set text filed focus after some delay
setTimeout(function() { jQuery('#searchTF').focus() }, 20);
// Do your work.....
}

Try to wrap it into document ready function and be sure, that you have jquery included.
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.4.4/jquery.min.js"></script>
<script>
$(document).ready(function() {
$("#test").focus();
});
</script>

<div id="txtROSComments" contenteditable="true" onkeyup="SentenceCase(this, event)"style="border: 1px solid black; height: 200px; width: 200px;">
</div>
<script type="text/javascript">
function SentenceCase(inField, e) {
debugger;
var charCode;
if (e && e.which) {
charCode = e.which;
} else if (window.event) {
e = window.event;
charCode = e.keyCode;
}
if (charCode == 190) {
format();
}
}
function format() {
debugger; ;
var result = document.getElementById('txtROSComments').innerHTML.split(".");
var finaltxt = "";
var toformat = result[result.length - 2];
result[0] = result[0].substring(0, 1).toUpperCase() + result[0].slice(1);
if (toformat[0] != " ") {
for (var i = 0; i < result.length - 1; i++) {
finaltxt += result[i] + ".";
}
document.getElementById('txtROSComments').innerHTML = finaltxt;
alert(finaltxt);
abc();
return finaltxt;
}
if (toformat[0].toString() == " ") {
debugger;
var upped = toformat.substring(1, 2).toUpperCase();
var formatted = " " + upped + toformat.slice(2);
for (var i = 0; i < result.length - 1; i++) {
if (i == (result.length - 2)) {
finaltxt += formatted + ".";
}
else {
finaltxt += result[i] + ".";
}
}
}
else {
debugger;
var upped = toformat.substring(0, 1).toUpperCase();
var formatted = " " + upped + toformat.slice(1);
for (var i = 0; i < result.length - 1; i++) {
if (i == (result.length - 2)) {
finaltxt += formatted + ".";
}
else {
//if(i
finaltxt += result[i] + ".";
}
}
}
debugger;
document.getElementById('txtROSComments').value = finaltxt;
return finaltxt;
}
</script>
<script type="text/javascript">
function abc() {
document.getElementById("#txtROSComments").focus();
}

It works fine in this example
http://jsfiddle.net/lmcculley/rYfvQ/