dont know why touch events triggered twice - javascript

I'm using Jquery Mobile, and my touch events are being triggered twice. At first I thought it might be an overlap between mouse events and touch events, but I tried to unbind mouse events on tablets/smartphones and the events are still being triggered twice.
Here is my code
//Tablet Features
var eventType = {
swipeleft: '-=100',
swiperight: '+=100'
}
$('#navMenu').bind('swipeleft swiperight',
function(e) {
$('#prbBtnHolder').animate({left:eventType[e.type]});
//alert(e.type);
}
);
//Device Detection
(function () {
var agent = navigator.userAgent.toLowerCase();
var isDevice = agent.match(/android/i);
if (isDevice == 'android') {
//alert(isDevice);
$('*').unbind('mousedown').unbind('mouseout').unbind('mousemove').unbind('mouseup');
}
})();
I've been trying to figure this out for a while, please help if you have any ideas.
UPDATE
I managed to solve the problem locally by placing the touch handlers outside the .ready() method. However, when i run the page on the server, the double trigger happens again. Now I'm completely stumped. Why are two identical pages (literally identical) behaving differently locally and on the server?

I had the same problem and fixed it with a little tweak around... I don't recommend this for the exact solution but my take you out of the problem fast.
I define a global Flag
var bDidPan=true;
and inside the trigger wrote the following:
if (bDidPan) {
bDidPan = false; // IT'S IMPORTANT TO PUT THIS FIRST
//code to execute when triggers
}
else
{
bDidPan = true;
}
and that did the trick. You can do the trick with numbers (It worked better with numbers for me!)
Hope it helps!

This sounds like you're putting your scripts into the <body> tag. If you do that, they'll get run twice. I've had this very same thing happen and went a little balder for the trouble and frustration. Make sure all your scripts are inside the <head> tag.

Related

Scroll event won't fire what so ever

I have a (fairly simple) issue and I'm breaking my head over it.
The issue is pretty simple - scroll event won't fire (ever).
I'm writing this angular project, so I've tried the following:
angular.element($window).bind('scroll', ()=> {
console.log('scroll!');
if (!scope.scrollPosition) {
scope.scrollPosition = 0;
}
// Alerting for test cause wtf is going on
scope.boolChangeClass = this.pageYOffset > 600 ? alert(true) : alert(false);
scope.scrollPosition = this.pageYOffset;
scope.$apply();
}
);
but nothing happened. (assume $window is intact and that i'm using webpack etc.)
This example works great if I change the scroll to click. weird.
So I've tried vanilla~~!
window.addEventListener('scroll',function(){
console.log('test')
})
This attempt works on every other website except mine (gotta admit it's classic).
So - has anyone ever dealt with this and knows what's going on?
I assume that some other element is consuming this event at early stage thus not letting it bubble up. Yet this is just an assumption.'
Would love to understand this :)
=== EDIT ===
I've tried to see all the fired events using monitorEvents(window) (using Chrome) and I see every event that's being fire except the scroll..
Looks like it's the body element that is scrolling. Try adding the following code in the console.
document.body.addEventListener('scroll', function() {
console.log('test');
});

Running function on window scroll once in jQuery

I'm creating my portfolio and I'm trying to make my skill bars load when I go to "My skills" section. I want them to do it only once, either when someone scroll to this section or goes to it straight away from the navigation. This is my code:
var skills = $('#mySkills');
var skillsPositionTop = skills.position().top;
$(window).on("resize scroll", function (){
if (pageYOffset<skillsPositionTop-20 && pageYOffset>skillsPositionTop-80){
console.log ("here is my loading script");
}
});
It doesn't work when I use one instead of on, doesn't work when I created one more function on window with one inside my if statement.
I was trying exit the function with return or return false as well and here, on stack overflow I found something about flag, which I didn't fully understand but I tried different combinations with it.
Can someone please help me with it? I've seen there is a library for this type of effects, but there is no point of installing any just for one thing...
Edit. Console.log represens my loading code.
You can set a namespace at .on() for resize, scroll events, use .off() within if statement to remove namespaced events.
var skills = $('#mySkills');
var skillsPositionTop = skills.position().top;
$(window).on("resize.once scroll.once", function (){
if (pageYOffset<skillsPositionTop-20 && pageYOffset>skillsPositionTop-80) {
$(this).off("resize.once").off("scroll.once");
console.log ("here is my loading script");
}
});

Javascript event handler (mouseover) not firing

I have a homepage that dynamically writes javascript in order to handle the mouseover of potential user choices. However, the .bind("mouseover",function()) does not seem to be working.
The PHP produces a script like this:
<script type="text/javascript">
function setPreview(art, title, rt, excerpt) {
$("#boxPreview").attr("src", art);
$("#selectedTitle").text(title);
$("#runningTime").text(rt);
$("#excerpt").text(excerpt);
}
$(document).ready(function() {
$("#tb0").bind("mouseover",setPreview(url,title,running time,excerpt));
$("#tb1").bind("mouseover",setPreview(url,title,running time,excerpt));
$("#tb2").bind("mouseover",setPreview(url,title,running time,excerpt));
$("#tb3").bind("mouseover",setPreview(url,title,running time,excerpt));
</script>
However, it seems that the mouseover event never fires. Instead, it seems that when the page is fully loaded, setPreview is run for the very last element (#tb3).
I have no idea what I'm doing wrong. If you would like to see the page in action for yourself, you can view it here.
You may try writing the same code like this
$("#tb0").bind("mouseover" , function(){
setPreview(url,title,running time,excerpt);
});
This may solve your issue. Because i've got same issue before but it was fixed writing this way.

Struggling with onmouseover and onmouseout

I am struggling with onmouseover and onmouseout.
Every site I have been to shows this syntax almost exactly. I practically copied pasted it from Mozilla. The problem I’m having is that it calls the largeDiv and smallDiv functions immediately. (Eventually, I am hoping to apply a new class to the div when during the mouseover event, and return to the old class when mouseout.) I am pretty sure that my mouse events are to blame. I was also wondering if my onload function caused any problems, but when I commented it out, the only thing that changed was the small div did not load, as expected.
I tried to use an event listener, thinking I wasn’t calling the event properly, but that did not work at all, although I am not sure I coded it properly, and didn’t spend more than an hour on the damn thing! I have tried numerous tweaks, camelcasing onmouseover, using parenthesis, etc… Anyway, here is the code:
var introEl = document.getElementById("intro");
//display large div by default and
//use small div with js enabled
window.onload = function(){
introEl.className = "small";
}
function largeDiv(){
console.log("It Worked");
};
function smallDiv(){
console.log("Mouse Out!");
};
introEl.onmouseover = largeDiv();
introEl.onmouseout = smallDiv();
I coded this in my browser and when I copied it to jsFiddle to ask this question it wouldn’t load the small div on load, but it did log the statements. I put it on CodePen and it worked as I have described. Not sure what caused this but this is the second time this has happened.
By the way, if you go to CodePen or jsFiddle, I know my design skills are lacking. I am just doing this for a playground, and for a place to keep code that works, like a notebook. I promise you it will get much much worse.
As always, any help is appreciated.
var introEl = document.getElementById("intro");
//display large div by default and
//use small div with js enabled
window.onload = function(){
introEl.className = "small";
}
function largeDiv(){
console.log("It Worked");
};
function smallDiv(){
console.log("Mouse Out!");
};
introEl.onmouseover = largeDiv; // here you don't need "()" with your defined functions
introEl.onmouseout = smallDiv; // here you don't need "()" with your defined functions
Please go to following fiddle i have made some small changes and its working fine for me
fiddle
Also You could have used
<div id="intro" onmouseover="largeDiv();" onmouseout="smallDiv();">
Mouse over this text
</div>
See working example here fiddle 2

JavaScript changes to style being delayed

I'm running into a little problem that's driving me crazy, and I'd welcome any thoughts as to the cause. At this point I feel like I'm just going 'round in circles.
I have the following code:
function JSsortTable(phase) {
dynaLoadingDivShow();
createSortArray();
dataArr = do2DArraySort(dataArr, orderList, orderDir);
sortArrayToRs();
dynaListTable.tableControl.refreshTableViaObjects(rsDynaList, colObjs);
dynaLoadingDivHide();
}
function dynaLoadingDivShow() {
document.getElementById('dynaReportGuiWorking').style.display = 'block';
document.getElementById('dynaReportGuiWorking').style.visibility = 'visible';
}
function dynaLoadingDivHide() {
document.getElementById('dynaReportGuiWorking').style.display = 'none';
document.getElementById('dynaReportGuiWorking').style.visibility = 'hidden';
}
<div style="visibility:hidden; display:none; z-index:25;" class="tableControlHeader" id="dynaReportGuiWorking">
Working...
</div>
I call JSsortTable as an onclick event. When I run the above code as is, I never see the div in question. The JSsortTable function takes some 800-2500 ms to run so it's highly unlikely I just missed it the 10+ times I tried. If I change the style of the div to start out visible, then it will remain visible until after JSsortTable has finished running and then disappear; exactly as expected. So I figured the problem was in dynaLoadingDivShow.
Now, I tried removing dynaLoadingDivHide to see what would happen and found something completely unexpected. The div will not appear when you the JSsortTable function fires. Instead, after all the other code has been run, when JSsortTable finishes, the div becomes visible. It's alomst as though IE (version 8) is saving up all the changes to the DOM and then waiting until the end to paint them. This is, obviously, not the desired behavior.
Anyone have any thoughts on this? I'm only allowed to have IE at work so I haven't tried this on other browsers. I have enough CSS/JS knowledge to be dangerous, but am by no means an expert yet. ;)
Thanks!
You'll need to use a timeout:
function JSsortTable() {
dynaLoadingDivShow();
setTimeout(JSortTableWork);
}
function JSortTableWork()
createSortArray();
dataArr = do2DArraySort(dataArr, orderList, orderDir);
sortArrayToRs();
dynaListTable.tableControl.refreshTableViaObjects(rsDynaList, colObjs);
dynaLoadingDivHide();
}
Note that I took out the parameter phase because it's not used in the function. If you do need the parameter then you'll need to modify the timeout as
setTimeout(function(){JSortTableWork(phase);});
and also add the parameter to JSortTableWork

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