(function ($) {
var window = $(window),
one = $("#one"),
two = $("#two"),
three = $("#three"),
four = $("#four"),
oneT = one.offset().top,
twoT = two.offset().top,
threeT = three.offset().top,
fourT = four.offset().top;
function Scroll(div) {
var tp = $(div).offset().top;
$("html, body").animate({ scrollTop: tp }, 500);
}
var tmp = 0;
var mousewheelevt = /Firefox/i.test(navigator.userAgent)
? "DOMMouseScroll"
: "mousewheel";
$("section").bind(mousewheelevt, function (e) {
var evt = window.event || e;
evt = evt.originalEvent ? evt.originalEvent : evt;
var delta = evt.detail ? evt.detail * -40 : evt.wheelDelta;
console.log(delta);
if (delta < 0) {
tmp++;
if (tmp > 0) {
var divT = $(this).next();
Scroll(divT);
tmp = 0;
}
} else if (delta > 0) {
tmp--;
console.log("going up");
if (tmp < -1) {
var divT = $(this).prev();
Scroll(divT);
tmp = 0;
}
}
});
})(jQuery);
This is the code im using is there any problem , i am getting error called
index.html:100 Uncaught TypeError: Cannot read properties of undefined (reading 'top')
Can you please help me with this.
You likely do not have 4 sections in your HTML or you have divs with a class and you need a dot: $(".section")
Then you need to use the wheel event instead of your current deprecated code
jQuery messes things up and you need to then use the originalEvent
You do not actually use any of the vars you declared in the beginning
I also got rid of half the tests by testing the existence of next/prev
(function($) {
function Scroll($div) {
var tp = $div.offset().top;
$("html, body").animate({
scrollTop: tp
}, 500);
}
const $sections = $("section");
$sections.on("wheel", function(e) {
const delta = e.originalEvent.wheelDelta; // all newer browsers
const down = delta < 0;
let $divT = down ? $(this).next("section") : $(this).prev("section");
// we may get a next or previous that is undefined - not obvious
if (!$divT.attr("id") || $divT.length === 0) {
if (down) $divT = $sections.first();
else $divT = $sections.last();
}
Scroll($divT);
});
})(jQuery);
section {
height: 500px;
border: 1px solid black;
}
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.6.0/jquery.min.js"></script>
<section id="one">One</section>
<section id="two">Two</section>
<section id="three">Three</section>
<section id="four">Four</section>
I'm using AngularJS ver. 1.2.15 on my project. And, I have a select element on one of my views as per below:
<select class="select-white form-control form-select" id="cat2_{{feed.id}}" ng-model="feed.operationstatusid" ng-change="updateCategoryAndStatus(feed, true)"></select>
And, I'm feeding this element like this:
function SetCategory2(cat1Id, feed) {
var feedId = feed.id;
var fromRuleOpStatusId = -1;
$('#cat2_' + feedId).find('option').remove();
if (cat1Id > -1) {
$('#cat2_' + feedId).append($('<option></option>').text(lang.SelectSubCategory).val(0));
$.each($scope.category2, function (index, cat2Item) {
$('#cat2_' + feedId).append($('<option></option>').text(cat2Item.statusdescription).val(cat2Item.id));
});
var isselected = false;
$.each($scope.category2, function (index, cat2Item) {
if (feed.operationstatusid == cat2Item.id) {
$('#cat2_' + feedId).val(cat2Item.id);
fromRuleOpStatusId = -1;
isselected = true;
}
else {
var feedStr = "";
if (feed.title != undefined && feed.title != null) {
feedStr = feed.title.toLowerCase();
}
if ($scope.catTitleRulesTwo) {
$.each($scope.catTitleRulesTwo, function (r_index, r_item) {
if (cat2Item.id == r_item.titleCode && !isselected) {
if (feedStr != undefined && feedStr != null && r_item != undefined && r_item != null) {
String.prototype.contains = function (str) { return this.toLowerCase().indexOf(str) !== -1; };
var text = feedStr;
if (eval(r_item.ruleexpression)) {
$('#cat2_' + feedId).val(cat2Item.id);
fromRuleOpStatusId = cat2Item.id;
isselected = true;
}
}
}
});
}
}
});
if (fromRuleOpStatusId != -1) {
feed.operationstatusid = fromRuleOpStatusId;
}
}
else {
$('#cat2_' + feedId).append($('<option></option>').text(lang.SelectSubCategory).val(0));
}
}
I am aware of the facts about eval function, but the project I'm working on is quite old, so does the code. Anyway, this is about business logic and quite irrelevant with the thing I'm going to ask (or so I was thinking).
As you can see I'm appending all the options before I set the value of the selectbox with using .val(...). I have also checked that values do match along with the data types. But, when I observe this function step by step, I saw that selected value does show up without flaw. After the code finish with my above mentioned function (SetCategory2), code goes through on of the function located on AngularJS file, named xhr.onreadystatechange. It's not a long function, so I'm sharing it also on below.
xhr.onreadystatechange = function() {
if (xhr && xhr.readyState == 4) {
var responseHeaders = null,
response = null;
if(status !== ABORTED) {
responseHeaders = xhr.getAllResponseHeaders();
response = ('response' in xhr) ? xhr.response : xhr.responseText;
}
completeRequest(callback,
status || xhr.status,
response,
responseHeaders);
}
};
After the code released from this function, respective selectbox's value is pointed at the empty option.
I have run into topics which talks about this behaviour might due to invalid option-value match, but as I described above, I append all my options before deciding the value. So, I can't figure out what I'm missing.
Thank you in advance.
Whilst in a html textarea input, I want the tab keyboard button to act like a Word processor-style indentation key rather than skipping to the next element.
How can this be done?
google is your friend! link
function insertTab(o, e)
{
var kC = e.keyCode ? e.keyCode : e.charCode ? e.charCode : e.which;
if (kC == 9 && !e.shiftKey && !e.ctrlKey && !e.altKey)
{
var oS = o.scrollTop;
if (o.setSelectionRange)
{
var sS = o.selectionStart;
var sE = o.selectionEnd;
o.value = o.value.substring(0, sS) + "\t" + o.value.substr(sE);
o.setSelectionRange(sS + 1, sS + 1);
o.focus();
}
else if (o.createTextRange)
{
document.selection.createRange().text = "\t";
e.returnValue = false;
}
o.scrollTop = oS;
if (e.preventDefault)
{
e.preventDefault();
}
return false;
}
return true;
}
<textarea onkeydown="insertTab(this, event);"></textarea>
Impress.js supports a number of attributes:
data-x, data-y, data-z will move the slide on the screen in 3D space;
data-rotate, data-rotate-x, data-rotate-y rotate the element around the specified axis (in degrees);
data-scale – enlarges or shrinks the slide.
div id="intro" class="step" data-x="0" data-y="0">
<h2>Introducing Galaxy Nexus</h2>
<p>Android 4.0<br /> Super Amoled 720p Screen<br />
<img src="assets/img/nexus_1.jpg" width="232" height="458" alt="Galaxy Nexus" />
<!-- We are offsetting the second slide, rotating it and making it 1.8 times larger -->
<div id="simplicity" class="step" data-x="1100" data-y="1200" data-scale="1.8" data-rotate="190">
<h2>Simplicity in Android 4.0</h2>
<p>Android 4.0, Ice Cream Sandwich brings an entirely new look and feel..</p>
<img src="assets/img/nexus_2.jpg" width="289" height="535" alt="Galaxy Nexus" />
Impress.js
(function ( document, window ) {
'use strict';
// HELPER FUNCTIONS
var pfx = (function () {
var style = document.createElement('dummy').style,
prefixes = 'Webkit Moz O ms Khtml'.split(' '),
memory = {};
return function ( prop ) {
if ( typeof memory[ prop ] === "undefined" ) {
var ucProp = prop.charAt(0).toUpperCase() + prop.substr(1),
props = (prop + ' ' + prefixes.join(ucProp + ' ') + ucProp).split(' ');
memory[ prop ] = null;
for ( var i in props ) {
if ( style[ props[i] ] !== undefined ) {
memory[ prop ] = props[i];
break;
}
}
}
return memory[ prop ];
}
})();
var arrayify = function ( a ) {
return [].slice.call( a );
};
var css = function ( el, props ) {
var key, pkey;
for ( key in props ) {
if ( props.hasOwnProperty(key) ) {
pkey = pfx(key);
if ( pkey != null ) {
el.style[pkey] = props[key];
}
}
}
return el;
}
var byId = function ( id ) {
return document.getElementById(id);
}
var $ = function ( selector, context ) {
context = context || document;
return context.querySelector(selector);
};
var $$ = function ( selector, context ) {
context = context || document;
return arrayify( context.querySelectorAll(selector) );
};
var translate = function ( t ) {
return " translate3d(" + t.x + "px," + t.y + "px," + t.z + "px) ";
};
var rotate = function ( r, revert ) {
var rX = " rotateX(" + r.x + "deg) ",
rY = " rotateY(" + r.y + "deg) ",
rZ = " rotateZ(" + r.z + "deg) ";
return revert ? rZ+rY+rX : rX+rY+rZ;
};
var scale = function ( s ) {
return " scale(" + s + ") ";
};
var getElementFromUrl = function () {
// get id from url # by removing `#` or `#/` from the beginning,
// so both "fallback" `#slide-id` and "enhanced" `#/slide-id` will work
return byId( window.location.hash.replace(/^#\/?/,"") );
};
// CHECK SUPPORT
var ua = navigator.userAgent.toLowerCase();
var impressSupported = ( pfx("perspective") != null ) &&
( document.body.classList ) &&
( document.body.dataset ) &&
( ua.search(/(iphone)|(ipod)|(android)/) == -1 );
var roots = {};
var impress = window.impress = function ( rootId ) {
rootId = rootId || "impress";
// if already initialized just return the API
if (roots["impress-root-" + rootId]) {
return roots["impress-root-" + rootId];
}
// DOM ELEMENTS
var root = byId( rootId );
if (!impressSupported) {
root.className = "impress-not-supported";
return;
} else {
root.className = "";
}
// viewport updates for iPad
var meta = $("meta[name='viewport']") || document.createElement("meta");
// hardcoding these values looks pretty bad, as they kind of depend on the content
// so they should be at least configurable
meta.content = "width=1024, minimum-scale=0.75, maximum-scale=0.75, user-scalable=no";
if (meta.parentNode != document.head) {
meta.name = 'viewport';
document.head.appendChild(meta);
}
var canvas = document.createElement("div");
canvas.className = "canvas";
arrayify( root.childNodes ).forEach(function ( el ) {
canvas.appendChild( el );
});
root.appendChild(canvas);
var steps = $$(".step", root);
// SETUP
// set initial values and defaults
document.documentElement.style.height = "100%";
css(document.body, {
height: "100%",
overflow: "hidden"
});
var props = {
position: "absolute",
transformOrigin: "top left",
transition: "all 0s ease-in-out",
transformStyle: "preserve-3d"
}
css(root, props);
css(root, {
top: "50%",
left: "50%",
perspective: "1000px"
});
css(canvas, props);
var current = {
translate: { x: 0, y: 0, z: 0 },
rotate: { x: 0, y: 0, z: 0 },
scale: 1
};
var stepData = {};
var isStep = function ( el ) {
return !!(el && el.id && stepData["impress-" + el.id]);
}
steps.forEach(function ( el, idx ) {
var data = el.dataset,
step = {
translate: {
x: data.x || 0,
y: data.y || 0,
z: data.z || 0
},
rotate: {
x: data.rotateX || 0,
y: data.rotateY || 0,
z: data.rotateZ || data.rotate || 0
},
scale: data.scale || 1,
el: el
};
if ( !el.id ) {
el.id = "step-" + (idx + 1);
}
stepData["impress-" + el.id] = step;
css(el, {
position: "absolute",
transform: "translate(-50%,-50%)" +
translate(step.translate) +
rotate(step.rotate) +
scale(step.scale),
transformStyle: "preserve-3d"
});
});
// making given step active
var active = null;
var hashTimeout = null;
var goto = function ( el ) {
if ( !isStep(el) || el == active) {
// selected element is not defined as step or is already active
return false;
}
// Sometimes it's possible to trigger focus on first link with some keyboard action.
// Browser in such a case tries to scroll the page to make this element visible
// (even that body overflow is set to hidden) and it breaks our careful positioning.
//
// So, as a lousy (and lazy) workaround we will make the page scroll back to the top
// whenever slide is selected
//
// If you are reading this and know any better way to handle it, I'll be glad to hear about it!
window.scrollTo(0, 0);
var step = stepData["impress-" + el.id];
if ( active ) {
active.classList.remove("active");
}
el.classList.add("active");
root.className = "step-" + el.id;
// `#/step-id` is used instead of `#step-id` to prevent default browser
// scrolling to element in hash
//
// and it has to be set after animation finishes, because in chrome it
// causes transtion being laggy
window.clearTimeout( hashTimeout );
hashTimeout = window.setTimeout(function () {
window.location.hash = "#/" + el.id;
}, 1000);
var target = {
rotate: {
x: -parseInt(step.rotate.x, 10),
y: -parseInt(step.rotate.y, 10),
z: -parseInt(step.rotate.z, 10)
},
translate: {
x: -step.translate.x,
y: -step.translate.y,
z: -step.translate.z
},
scale: 1 / parseFloat(step.scale)
};
// check if the transition is zooming in or not
var zoomin = target.scale >= current.scale;
// if presentation starts (nothing is active yet)
// don't animate (set duration to 0)
var duration = (active) ? "1s" : "0";
css(root, {
// to keep the perspective look similar for different scales
// we need to 'scale' the perspective, too
perspective: step.scale * 1000 + "px",
transform: scale(target.scale),
transitionDuration: duration,
transitionDelay: (zoomin ? "500ms" : "0ms")
});
css(canvas, {
transform: rotate(target.rotate, true) + translate(target.translate),
transitionDuration: duration,
transitionDelay: (zoomin ? "0ms" : "500ms")
});
current = target;
active = el;
return el;
};
var prev = function () {
var prev = steps.indexOf( active ) - 1;
prev = prev >= 0 ? steps[ prev ] : steps[ steps.length-1 ];
return goto(prev);
};
var next = function () {
var next = steps.indexOf( active ) + 1;
next = next < steps.length ? steps[ next ] : steps[ 0 ];
return goto(next);
};
window.addEventListener("hashchange", function () {
goto( getElementFromUrl() );
}, false);
window.addEventListener("orientationchange", function () {
window.scrollTo(0, 0);
}, false);
// START
// by selecting step defined in url or first step of the presentation
goto(getElementFromUrl() || steps[0]);
return (roots[ "impress-root-" + rootId ] = {
goto: goto,
next: next,
prev: prev
});
}
})(document, window);
// EVENTS
(function ( document, window ) {
'use strict';
// keyboard navigation handler
document.addEventListener("keydown", function ( event ) {
if ( event.keyCode == 9 || ( event.keyCode >= 32 && event.keyCode <= 34 ) || (event.keyCode >= 37 && event.keyCode <= 40) ) {
switch( event.keyCode ) {
case 33: ; // pg up
case 37: ; // left
case 38: // up
impress().prev();
break;
case 9: ; // tab
case 32: ; // space
case 34: ; // pg down
case 39: ; // right
case 40: // down
impress().next();
break;
}
event.preventDefault();
}
}, false);
// delegated handler for clicking on the links to presentation steps
document.addEventListener("click", function ( event ) {
// event delegation with "bubbling"
// check if event target (or any of its parents is a link)
var target = event.target;
while ( (target.tagName != "A") &&
(target != document.body) ) {
target = target.parentNode;
}
if ( target.tagName == "A" ) {
var href = target.getAttribute("href");
// if it's a link to presentation step, target this step
if ( href && href[0] == '#' ) {
target = document.getElementById( href.slice(1) );
}
}
if ( impress().goto(target) ) {
event.stopImmediatePropagation();
event.preventDefault();
}
}, false);
// delegated handler for clicking on step elements
document.addEventListener("click", function ( event ) {
var target = event.target;
// find closest step element
while ( !target.classList.contains("step") &&
(target != document.body) ) {
target = target.parentNode;
}
if ( impress().goto(target) ) {
event.preventDefault();
}
}, false);
// touch handler to detect taps on the left and right side of the screen
document.addEventListener("touchstart", function ( event ) {
if (event.touches.length === 1) {
var x = event.touches[0].clientX,
width = window.innerWidth * 0.3,
result = null;
if ( x < width ) {
result = impress().prev();
} else if ( x > window.innerWidth - width ) {
result = impress().next();
}
if (result) {
event.preventDefault();
}
}
}, false);
})(document, window);
My question is the Impress.js supposedly to process the data-x, data-y, data-scale attribute of the div tag. But I don't see where the code in Impress.js is doing that. Can someone point it out?
This intro to datasets may help.
First this part checking support for .dataset:
// CHECK SUPPORT
var ua = navigator.userAgent.toLowerCase();
var impressSupported = ( pfx("perspective") != null ) &&
( document.body.classList ) &&
( document.body.dataset ) &&
( ua.search(/(iphone)|(ipod)|(android)/) == -1 );
Then this part of the code, about halfway down:
steps.forEach(function ( el, idx ) {
var data = el.dataset,
step = {
translate: {
x: data.x || 0,
y: data.y || 0,
z: data.z || 0
},
rotate: {
x: data.rotateX || 0,
y: data.rotateY || 0,
z: data.rotateZ || data.rotate || 0
},
scale: data.scale || 1,
el: el
};
Im creating an object to drag with "touchmove" in Y but i want it only to be dragged in one direction, up!
But it also makes it go down.. How can i solve this?
In each interval of Y some actions will take place there and the objective is to drag the item only in one way disabling the possibility to the user dont go to the previews actions.
Here is the code:
var moveMe = function(e) {
e.preventDefault();
var orig = e.originalEvent;
var y = event.touches[0].pageY;
if(y<=600 && y>420){
$(this).css({
top: orig.changedTouches[0].pageY
});
if(y<570 && y>=540){
}else {
if(y<540 && y>=510){
}else {
if(y<510 && y>=480){
}else {
if(y<480 && y>=450){
}else {
if(y<450 && y>=420){
}
}
}
}
}
}
};
$("#draggable").bind("touchstart touchmove", moveMe);
Not tested, but is it possible that you have a mistake in the following line?
var y = event.touches[0].pageY;
shoudn't you use here "e" instead of "event"?
hope it helps.