Develop Reference

Execute javascript for certain screen size

I have a javascript function that I need modified for certain screen sizes, though I've tried "if (screen.width <= 960) {... " and "if (window.width <= 960) {..." , only the part after "else" get's executed, like it's not even looking at the screen width I'm placing in the parenthesis.
Here is my function ( I know it's poorly written, but I'm new to javascript):
$(document).ready(function(){
var numberofscroll = 0;
var lastScrollTop = 0;
$("#home").scroll(function(){
var st = $(this).scrollTop();
(st > lastScrollTop) ? numberofscroll++ : numberofscroll--;
console.log(numberofscroll);
console.log(lastScrollTop);
console.log(st);
if (numberofscroll<2){
change_background2(numberofscroll);
}
else if (numberofscroll<3){
change_background3(numberofscroll);
}
else if (numberofscroll<4){
change_background4(numberofscroll);
}
lastScrollTop = st;
});
function change_background2(numberofscroll){
var i;
for (i = 2) {
$("#home").css("background-position","0 -652px");
}
}
function change_background3(numberofscroll){
var i;
for (i = 3) {
$("#home").css("background-position","0 -1326px");
}
}
function change_background4(numberofscroll){
var i;
for (i = 4) {
$("#home").css("background-position","0 -1978px");
}
}
)};

Corrections:
Changed all the for to ifs.
Corrected the parentheses.
Assigned a temp variable to ternary operation.
Changed all the i to numberofscroll
I believe the corrected JavaScript is:
$(document).ready(function () {
var numberofscroll = 0;
var lastScrollTop = 0;
$("#home").scroll(function () {
var st = $(this).scrollTop();
n = (st > lastScrollTop) ? numberofscroll++ : numberofscroll--;
console.log(numberofscroll);
console.log(lastScrollTop);
console.log(st);
if (numberofscroll < 2) {
change_background2(numberofscroll);
} else if (numberofscroll < 3) {
change_background3(numberofscroll);
} else if (numberofscroll < 4) {
change_background4(numberofscroll);
}
lastScrollTop = st;
});
function change_background2(numberofscroll) {
if (numberofscroll == 2) {
$("#home").css("background-position","0 -652px");
}
}
function change_background3(numberofscroll) {
if (numberofscroll == 3) {
$("#home").css("background-position","0 -1326px");
}
}
function change_background4(numberofscroll) {
if (numberofscroll == 4) {
$("#home").css("background-position","0 -1978px");
}
}
});

I think you want to use the innerWidth property of window. (https://developer.mozilla.org/en/docs/Web/API/window/innerWidth).

on.change() event doesn't run when manually setting value of <select>

As the title describes, I'm having a problem with a function running using the
$("element_name").on("change", some_function)
event on a select when manually setting the element's value like
$("element_name").val("")
I read something about a "chosen" and I don't understand what that has anything to do with the issue.
Anybody know why the on.change() handler isn't catching the manual value change?
EDIT: I am including additional information as the solutions suggested do not work.
trigger("change"), bind("change", and on("change") do not work.
This is the code for the recreated select that controls the value setting:
(function($) {
$.extend({
fancySelect: function(options) {
var defaults = {
autoClose: true
}
var options = $.extend(defaults, options);
$("select").hide();
$("select").each(function() {
var $select = $(this);
var $fancyselect = $('<div class="fancyselect"/>');
$select.after($fancyselect);
var $ul = $('<ul/>').appendTo($fancyselect);
$ul.hide();
var $options = $select.find("option");
var $span = $("<div/>").addClass("fancyselect-label").prependTo($fancyselect);
var $arrow = $("<div>▼</div>").addClass("fancyselect-arrow").appendTo($fancyselect);
var selected = $select.find("option[selected=selected]");
var toUse = 0;
if (selected.length == 0) {
toUse = $options.first();
} else {
toUse = selected.first();
}
$span.text(toUse.text());
$options.each(function() {
var $option = $(this);
var label = $option.text();
var value = $option.val();
if ($option.is(":selected")) {
$span.text(label);
}
var $li = $('<li value="' + value + '">' + label + '</li>').appendTo($ul).bind("click", function() {
$select.val(value);
if ($option.index() == $(this).index()) {
$options.removeAttr("selected");
$option.attr("selected", "selected");
}
$span.html(label);
if (options.autoClose) {
$ul.hide();
$fancyselect.removeClass("active");
}
$ul.find("li").removeAttr("class");
$(this).addClass("selected");
});
if ($option.is(":selected")) {
$li.addClass("selected");
}
});
if (!$select.attr("disabled")) {
var $j = 0;
$span.bind("click", function() {
if ($ul.is(":visible")) {
$ul.hide();
$fancyselect.removeClass("active");
$arrow.html("▼");
} else {
$(".fancyselect").each(function() {
$(this).find("ul").hide();
$(this).removeClass("active");
});
$ul.show();
$fancyselect.addClass("active");
$arrow.html("▼");
if ($j == 0) $ul.tinyScrollbar();
$j++;
}
});
} else {
$fancyselect.addClass("disabled");
}
});
$(document).bind("keyup keydown keypress", function(event) {
$(".fancyselect").each(function() {
var $ul = $(this).find("ul");
if ($ul.is(":visible")) {
var keycode = parseInt((event.keyCode ? event.keyCode : event.which));
if(keycode >= 48 && keycode <= 90){
$ul.find("li").each(function() {
if ($(this).text().substr(0, 1) == String.fromCharCode(event.keyCode)) {
$ul.find("li").removeAttr("class");
$(this).addClass("selected");
return;
}
});
} else if (keycode == 13) {
$ul.hide();
}
return;
}
});
});
}
});
})(jQuery);
$.fancySelect();
And this is the code for the binding:
$(".downloads-series-sort select").trigger("change", load_downloads);

if statement echo out different links for different codes

I am using this code
HTML:
<div id="message">some message</div>
<input type="text" id="myInput" />​
jQuery:
$(function() {
$("#message").hide();
$("#fail").hide();
var prefix = ['HX', 'HD', 'BD', 'LS']
$('#myInput').keyup(function(e) {
var value = $(this).val();
var firstTwo = value.substr(0,2);
var firstTwoUpper = firstTwo.toUpperCase();
if(firstTwo != firstTwoUpper) {
$(this).val( value.replace(/^\w\w/, firstTwoUpper) );
}
if(value.length > 1) {
if($.inArray(firstTwoUpper, prefix) >= 0) {
$("#fail").hide();
$("#message:hidden").fadeIn();
} else {
$("#message").hide();
$("#fail:hidden").fadeIn();
}
} else {
$("#message").hide();
$("#fail").hide();
}
});
});
​
To be a post code check. I got the above code from here: Jquery check array perform function and it works just fine but I want to display a message containing a link which all differ from one another. For example I want code 'HX' to link to facebook and I want 'BD' to link to the BBC. How would I write the if statement correctly? I have tried various ways but I am not achieving what I need.
Could someone give me a little guideance please?
Thanks,
Ben.

This fiddle does what you might be looking for
<div id="message">Some link</div>
<div id="fail">Invalid postcode</div>
<input type="text" id="myInput" />
$(function () {
$("#message").hide();
$("#fail").hide();
var prefix = ['HX', 'HD', 'BD', 'LS'];
var links = ['http://www.facebook.com','http://www.example.com','http://www.bbc.com','#'];
$('#myInput').keyup(function (e) {
var value = $(this).val();
var firstTwo = value.substr(0, 2);
var firstTwoUpper = firstTwo.toUpperCase();
if (firstTwo != firstTwoUpper) {
$(this).val(value.replace(/^\w\w/, firstTwoUpper));
}
if (value.length > 1) {
var index = $.inArray(firstTwoUpper, prefix);
if (index >= 0) {
$("#fail").hide();
$("#message").fadeIn();
$("#message a").attr("href",links[index]).html(links[index])
} else {
$("#message").hide();
$("#fail:hidden").fadeIn();
}
} else {
$("#message").hide();
$("#fail").hide();
}
});
});

this fiddle: http://jsfiddle.net/um67M/2/
I changed prefix from an array of strings to an array of objects.
You're going to see an issue if users type really fast because of the speed of fadeIn().
$(function() {
$("#message").hide();
$("#fail").hide();
var prefix = [{code:'HX',link:'www.facebook.com'}, {code:'BD',link:'www.bbc.com'}];
$('#myInput').keyup(function(e) {
var value = $(this).val();
var firstTwo = value.substr(0,2);
var firstTwoUpper = firstTwo.toUpperCase();
if(firstTwo != firstTwoUpper) {
$(this).val( value.replace(/^\w\w/, firstTwoUpper) );
}
if(value.length > 1) {
for(var obj in prefix){
console.log(firstTwoUpper, prefix[obj].code, firstTwoUpper == prefix[obj].code);
if(firstTwoUpper === prefix[obj].code){
$("#fail").hide();
var link = ''+prefix[obj].link+'';
$("#message").append(link);
$("#message:hidden").fadeIn();
break;
}else {
$("#message").hide();
$("#fail:hidden").fadeIn();
}
};
} else {
$("#message").empty();
$("#message").hide();
$("#fail").hide();
}
});
});

$('#myInput').keyup(function (e) {
var value = $(this).val();
var firstTwo = value.substr(0, 2);
var firstTwoUpper = firstTwo.toUpperCase();
if (firstTwo != firstTwoUpper) {
$(this).val(value.replace(/^\w\w/, firstTwoUpper));
}
if (value.length > 1) {
if ($.inArray(firstTwoUpper, prefix) >= 0) {
if (firstTwoUpper == "HX") {
$("#message").empty();
$("#message").html('<p>some message</p>Google');
} else if (firstTwoUpper == "HD") {
$("#message").empty();
$("#message").html('<p>other message</p><a `enter code here`href="http://www.stackoverflow.com">Stack OverFlow</a>');
}
$("#fail").hide();
$("#message:hidden").fadeIn();
} else {
$("#message").hide();
$("#fail:hidden").fadeIn();
}
} else {
$("#message").hide();
$("#fail").hide();
}
});
the fiddle is here
fiddle

Navigate up and down in scrollable div with keycodes

I have a searchable textbox which populates a div with the search results. The div is scrollable. What I am trying to achieve, is to navigate through the result items with page up and down (keycode 38 & 40). But as soon as I try this, the whole div scrolls, and the result item itself does not take on the new selected css class.
Below is some of my code
this.TagNavigation = function (event) {
var div = $("#TagSearchResults");
var anchors = $("#TagSearchResults a");
var selectedAnchor = $("#TagSearchResults a.selected");
var position = anchors.index(selectedAnchor);
if (event.keyCode == "13" && anchors.length > 0) {
FRAMEWORK.AddUpdateInterventionTags(selectedAnchor.attr("id").split("-")[1] + "|" + selectedAnchor.text(), "add");
}
if (event.keyCode == "13" && anchors.length == 0 && $("#txtTagSearch").val() != "Start typing to search Tags") {
FRAMEWORK.AddNewTag($("#txtTagSearch").val());
}
else if (event.keyCode == "38") {
if (position > 0) {
canClose = false;
selectedAnchor.removeClass("selected");
var newSelectedAnchor = $(anchors.get(position - 1));
newSelectedAnchor.addClass("selected");
$("#txtTagSearch").val(newSelectedAnchor.text());
}
}
else if (event.keyCode == "40") {
if (position <= anchors.length) {
canClose = false;
selectedAnchor.removeClass("selected");
var newSelectedAnchor = $(anchors.get(position + 1));
newSelectedAnchor.addClass("selected");
$("#txtTagSearch").val(newSelectedAnchor.text());
//newSelectedAnchor.focus();
}
}
};
this.AjaxSearch = function (text) {
var div = $("#TagSearchResults");
var anchors = $("#TagSearchResults a");
var selectedAnchor = $("#TagSearchResults a.selected");
var position = anchors.index(selectedAnchor);
if (event.keyCode == "13") {
FRAMEWORK.TagNavigation(event);
}
else if (event.keyCode == "38") {
FRAMEWORK.TagNavigation(event);
}
else if (event.keyCode == "40") {
FRAMEWORK.TagNavigation(event);
}
else if (text.length >= 3) {
FRAMEWORK.RenderSearchResults(text);
}
else {
$("#TagSearchResults").html("");
$("#TagSearchResults").hide();
}
};
As you can see in the TagNavigation function (keycode 40), I tried to set the focus on the active element, but still no success.
Any help please.

You need to check weather the newly selected element has a higher Y value that the bottom of the containing div. If so, then scroll the div by the height of the new element. Change your 'if (event.keyCode == "40")' statement to the following:
this.TagNavigation = function (event) {
var div = $("#TagSearchResults");
var anchors = $("#TagSearchResults a");
var selectedAnchor = $("#TagSearchResults a.selected");
var position = anchors.index(selectedAnchor);
if (event.keyCode == "13" && anchors.length > 0) {
FRAMEWORK.AddUpdateInterventionTags(selectedAnchor.attr("id").split("-")[1] + "|" + selectedAnchor.text(), "add");
}
if (event.keyCode == "13" && anchors.length == 0 && $("#txtTagSearch").val() != "Start typing to search Tags") {
FRAMEWORK.AddNewTag($("#txtTagSearch").val());
}
else if (event.keyCode == "38") {
if (position > 0) {
canClose = false;
selectedAnchor.removeClass("selected");
var newSelectedAnchor = $(anchors.get(position - 1));
newSelectedAnchor.addClass("selected");
$("#txtTagSearch").val(newSelectedAnchor.text());
var newSelectedAnchorPosistion = newSelectedAnchor.offset();
var divPosition = div.offset();
divPosition = divPosition.top;
if (newSelectedAnchorPosistion.top + 1 > divPosition) {
var newPos = div.scrollTop() - newSelectedAnchor.outerHeight();
div.scrollTop(newPos);
}
}
}
else if (event.keyCode == "40") {
if (position < anchors.length - 1) {
canClose = false;
selectedAnchor.removeClass("selected");
var newSelectedAnchor = $(anchors.get(position + 1));
newSelectedAnchor.addClass("selected");
$("#txtTagSearch").val(newSelectedAnchor.text());
var newSelectedAnchorPosistion = newSelectedAnchor.offset();
var divPosition = div.offset();
divPosition = divPosition.top + div.outerHeight();
if (newSelectedAnchorPosistion.top + 1 >= divPosition) {
var newPos = div.scrollTop() + newSelectedAnchor.outerHeight();
div.scrollTop(newPos);
}
}
}
};

Passing string to javascript function results in value

Something really odd going on here, and I have gone round in circles trying to figure out what is going on...I have a couple of input boxes, with onchange events firing for them, the event being loaded with a JS function that takes the value ( name of another item ) and actions the function accordingly. Only thing is, when the value of the string arrives at the other function, it has somehow been assigned a numeric value, specifically that of the input box.
My php that helps build the form:
$filterfield = '"p_delweek"';
print "<span class='filter'>Del Week<input class='menulink spin-button' id='weekno' type='text' value='".$weekno."' onKeyUp='doFilter($filterfield)' onChange='doFilter($filterfield)' data-filtered='0'/><input type='button' value='Clear' onClick='doUnfilter()'></span>";
$filterfield = '"p_seedweek"';
print "<span class='filter'>Sow Week<input class='menulink spin-button' id='sowweekno' type='text' value='".$weekno."' onKeyUp='doFilter($filterfield)' onChange='doFilter($filterfield)' data-filtered='0'/><input type='button' value='Clear' onClick='doUnfilter()'></span>";
Resulting HTML in source:
<span class="filter">Del Week<input style="width: 50px; height: 22px;" class="menulink spin-button smartspinner" id="weekno" value="26" onkeyup='doFilter("p_delweek")' onchange='doFilter("p_delweek")' data-filtered="0" type="text"><input value="Clear" onclick="doUnfilter()" type="button"></span><span class="filter">Sow Week<input style="width: 50px; height: 22px;" class="menulink spin-button smartspinner" id="sowweekno" value="26" onkeyup='doFilter("p_seedweek")' onchange='doFilter("p_seedweek")' data-filtered="0" type="text"><input value="Clear" onclick="doUnfilter()" type="button"></span>
Javascript function that is called:
function doFilter(filterfield) {
console.log("DoFilter:"+filterfield);
var filterInfo=[
{
fieldName : filterfield,
logic : "equal",
value : Sigma.Util.getValue("weekno")
}
]
// the next lines action the filtering
var grid=Sigma.$grid("myGrid1");
console.log("filterinfo="+filterInfo);
var rowNOs=grid.applyFilter(filterInfo);
}
It all goes fine until we get to the console.log("DoFilter:"+filterfield) , which results in DoFilter:25; 25 happens to be the value of the input box.
How is it grabbing that value? How to pass the real one?

TBH — I'm not sure if I got what you're after. However, if you must call a function inline (I recommend that you don’t), you can pass a reference to the input field as parameter and make it available in the methods’s body:
<input onchange="doFilter('p_delweek', this)" type="text">
​
function doFilter(filterfield, field) {
console.log(filterfield);
// field is a reference to the input field, hence
console.log(field.value);
// will print the current value for this field
}

This is not the answer, this file is the problem:
(function($) {
$.fn.extend({
spinit: function(options) {
var settings = $.extend({ min: 0, max: 100, initValue: 0, callback: doFilter, stepInc: 1, pageInc: 10, width: 50, height: 15, btnWidth: 10, mask: '' }, options);
return this.each(function() {
var UP = 38;
var DOWN = 40;
var PAGEUP = 33;
var PAGEDOWN = 34;
var mouseCaptured = false;
var mouseIn = false;
var interval;
var direction = 'none';
var isPgeInc = false;
var value = Math.max(settings.initValue, settings.min);
var el = $(this).val(value).css('width', (settings.width) + 'px').css('height', settings.height + 'px').addClass('smartspinner');
raiseCallback(value);
if (settings.mask != '') el.val(settings.mask);
$.fn.reset = function(val) {
if (isNaN(val)) val = 0;
value = Math.max(val, settings.min);
$(this).val(value);
raiseCallback(value);
};
function setDirection(dir) {
direction = dir;
isPgeInc = false;
switch (dir) {
case 'up':
setClass('up');
break;
case 'down':
setClass('down');
break;
case 'pup':
isPgeInc = true;
setClass('up');
break;
case 'pdown':
isPgeInc = true;
setClass('down');
break;
case 'none':
setClass('');
break;
}
}
el.focusin(function() {
el.val(value);
});
el.click(function(e) {
mouseCaptured = true;
isPgeInc = false;
clearInterval(interval);
onValueChange();
});
el.mouseenter(function(e) {
el.val(value);
});
el.mousemove(function(e) {
if (e.pageX > (el.offset().left + settings.width) - settings.btnWidth - 4) {
if (e.pageY < el.offset().top + settings.height / 2)
setDirection('up');
else
setDirection('down');
}
else
setDirection('none');
});
el.mousedown(function(e) {
isPgeInc = false;
clearInterval(interval);
interval = setTimeout(onValueChange, 250);
});
el.mouseup(function(e) {
mouseCaptured = false;
isPgeInc = false;
clearInterval(interval);
});
el.mouseleave(function(e) {
setDirection('none');
if (settings.mask != '') el.val(settings.mask);
}); el.keydown(function(e) {
switch (e.which) {
case UP:
setDirection('up');
onValueChange();
break; // Arrow Up
case DOWN:
setDirection('down');
onValueChange();
break; // Arrow Down
case PAGEUP:
setDirection('pup');
onValueChange();
break; // Page Up
case PAGEDOWN:
setDirection('pdown');
onValueChange();
break; // Page Down
default:
setDirection('none');
break;
}
});
el.keyup(function(e) {
setDirection('none');
});
el.keypress(function(e) {
if (el.val() == settings.mask) el.val(value);
var sText = getSelectedText();
if (sText != '') {
sText = el.val().replace(sText, '');
el.val(sText);
}
if (e.which >= 48 && e.which <= 57) {
var temp = parseFloat(el.val() + (e.which - 48));
if (temp >= settings.min && temp <= settings.max) {
value = temp;
raiseCallback(value);
}
else {
e.preventDefault();
}
}
});
el.blur(function() {
if (settings.mask == '') {
if (el.val() == '')
el.val(settings.min);
}
else {
el.val(settings.mask);
}
});
el.bind("mousewheel", function(e) {
if (e.wheelDelta >= 120) {
setDirection('down');
onValueChange();
}
else if (e.wheelDelta <= -120) {
setDirection('up');
onValueChange();
}
e.preventDefault();
});
if (this.addEventListener) {
this.addEventListener('DOMMouseScroll', function(e) {
if (e.detail > 0) {
setDirection('down');
onValueChange();
}
else if (e.detail < 0) {
setDirection('up');
onValueChange();
}
e.preventDefault();
}, false);
}
function raiseCallback(val) {
if (settings.callback != null) settings.callback(val);
}
function getSelectedText() {
var startPos = el.get(0).selectionStart;
var endPos = el.get(0).selectionEnd;
var doc = document.selection;
if (doc && doc.createRange().text.length != 0) {
return doc.createRange().text;
} else if (!doc && el.val().substring(startPos, endPos).length != 0) {
return el.val().substring(startPos, endPos);
}
return '';
}
function setValue(a, b) {
if (a >= settings.min && a <= settings.max) {
value = b;
} el.val(value);
}
function onValueChange() {
if (direction == 'up') {
value += settings.stepInc;
if (value > settings.max) value = settings.max;
setValue(parseFloat(el.val()), value);
}
if (direction == 'down') {
value -= settings.stepInc;
if (value < settings.min) value = settings.min;
setValue(parseFloat(el.val()), value);
}
if (direction == 'pup') {
value += settings.pageInc;
if (value > settings.max) value = settings.max;
setValue(parseFloat(el.val()), value);
}
if (direction == 'pdown') {
value -= settings.pageInc;
if (value < settings.min) value = settings.min;
setValue(parseFloat(el.val()), value);
}
raiseCallback(value);
}
function setClass(name) {
el.removeClass('up').removeClass('down');
if (name != '') el.addClass(name);
}
});
}
});
})(jQuery);
Why and where does this alter the passing value of a function attached to the < INPUT > ?