Develop Reference

How to stop a timeout if it is running in javascript

I have a timeout setup like this below:
var someObj = {
init: function() {
someObj.timeout();
someObj.someWork();
},
timeout : setTimeout(function() {
someObj.myFunc();
}, 15000),
myFunc: function() {
console.log('myFunction called');
},
someWork: function(){
console.log('some work');
if(this.timeout !== null){
console.log('clearing timeout...');
clearTimeout(this.timeout);
}
}
}
$(function() {
someObj.init();
});
I want to stop the timeout if it is assigned to timeout variable and not null.
Jsfiddle link: https://jsfiddle.net/jy2p7jtd/17/
Is it possible?
Update:
Is this valid way to assign a timeout and clear it?
var someObj = {
timeout :null,
init: function() {
someObj.make();
someObj.someWork();
},
make: function(){
this.timeout = setTimeout(function() {
console.log('myFunction called');
}, 15000)
},
someWork: function(){
console.log('timeout is ', this.timeout);
if(this.timeout !== null){
console.log('clearing timeout...');
clearTimeout(this.timeout);
}
}
}
$(function() {
someObj.init();
});
updated link: https://jsfiddle.net/jy2p7jtd/41/

declare another property timeoutId:null and check if it is present then clear it.
var someObj = {
timeoutId: null,
init: function() {
this.timeoutId = this.timeout();
someObj.someWork();
},
timeout: function() {
return setTimeout(function() {
someObj.myFunc();
}, 15000)
},
myFunc: function() {
console.log('myFunction called');
},
someWork: function() {
console.log('some work');
if (this.timeoutId) {
console.log('clearing timeout...');
clearTimeout(this.timeoutId);
}
}
}
$(function() {
someObj.init();
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>

clearTimeout() prevents the function set with the setTimeout() to execute.

Play and Pause in BookBlock.js

How to create play and pause functionality in bookblock.js.
below is my js function which is invoked on click of play/pause button.
i am not able to pause(and again recycle) the slideshow using this function. what is wrong in this.
function playPauseSlide(obj) {
if (isPlay) {
$(obj).find('i').removeClass('glyphicon-pause').addClass('glyphicon-play');
$('#bb-bookblock').bookblock({ autoplay: false });
} else {
$(obj).find('i').removeClass('glyphicon-play').addClass('glyphicon-pause');
$('#bb-bookblock').bookblock({ autoplay: true, interval: 1000 });
}
isPlay = !isPlay;
}

after lots of trying i finally added play and pause functions in slide show by customizing the script.
jquery.bookblock.js
_pauseSlideshow: function () {
if ( this.options.autoplay ) {
clearTimeout( this.slideshow );
}
},
//// public method: pause the slide show
pause: function () {
this._pauseSlideshow();
},
//// public method: play again the paused slide show
playAgain: function () {
this.options.autoplay = true;
this._navigate('next', this.$currentItem);
this._startSlideshow();
},
In my view script
var config = {
$bookBlock: $('#bb-bookblock'),
$navNext: $('#nextPage'),
$navPrev: $('#prevPage'),
$navFirst: $('#bb-nav-first'),
$navLast: $('#bb-nav-last'),
$pause: $('#pause'),
$playAgain: $('#playAgain'),
},
initEvents = function () {
config.$pause.on('click touchstart', function () {
config.$bookBlock.bookblock('pause');
return false;
});
config.$playAgain.on('click touchstart', function () {
config.$bookBlock.bookblock('playAgain');
return false;
});
});

Javascript functions in custom namespaces

It is possible to declare 2 more functions in main function like this ?
var jquery4u = {
init: function() {
jquery4u.countdown.show();
},
countdown: function() {
show: function() {
console.log('show');
},
hide: function() {
console.log('hide');
}
}
}
jquery4u.init();
and i receive the following error: Uncaught SyntaxError: Unexpected token ( on this line "show: function() {"

Remove the function from the right of the countdown (demo)
var jquery4u = {
init: function() {
jquery4u.countdown.show();
},
countdown: {
show: function() {
console.log('show');
},
hide: function() {
console.log('hide');
}
}
}
jquery4u.init();
Next time, use jsFiddle to make a demo and click the "JSHint" button.

Actually, none of this will work. Unless you make countdown an object or you treat its sub-functions as proper functions.
Why: Under countdown, you created an instance of object not a function.
var jquery4u = {
countdown: function() {
show = function() {
console.log('show');
}
hide = function() {
console.log('hide');
}
jquery4u.countdown.show();
}
}
The above code is a valid code so it is possible. Unfortunately it will not return anything.
The proper way to do this is in this format:
var jquery4u = {
countdown: {
show: function() {
console.log('show');
},
hide: function() {
console.log('hide');
}
}
}
This will work. You can try it out by calling:
jquery4u.countdown.show();

To apply .delay() on mouseenter in my plugin

I got a div, that on mouseenter, is suppose to show another div. I'm not sure how to achive this in a plugin. This is my code and what I have tried so far.
Code: JsFiddle
<div class="hover-me"></div>
<div class="show-me"></div>
var Nav = {
hover_me: $('.hover-me'),
show_me: $('.show-me'),
init: function() {
Nav.toggle_display();
console.log('init');
},
toggle_display: function() {
Nav.hover_me.mouseenter(function() {
Nav.show();
});
Nav.hover_me.mouseleave(function () {
Nav.hide();
});
},
show: function() {
Nav.show_me.fadeIn();
},
hide: function() {
Nav.show_me.fadeOut();
}
};
I tried to do this, without any luck.
Nav.hover_me.mouseenter(function() {
Nav.delay(1000).show();
});

see Jimbo's comment:
var Nav = {
// [...]
timeoutId: undefined,
// [...]
};
Nav.hover_me.mouseenter(function() {
Nav.timeoutId = setTimeout(function() {
Nav.show();
}, 1000);
});
Nav.hover_me.mouseleave(function () {
if (Nav.timeoutId) { clearTimeout(Nav.timeoutId); }
Nav.hide();
});
SEE THE FIDDLE

how to wait the execution of line in Javascript?

$("#div_id").click(function() {
$(this).effect("shake", { times:3 }, 300);
// Here I want wait that the div_id can complete its shake
alert('hello');
}
.delay I tried but it is not working.

$(this).effect("shake", { times:3 }, 300, function() {
// this will alert once the animation has completed
alert('hello');
});

If you're using jQuery UI, you should just be able to add a callback as the 4th parameter.
See: http://jqueryui.com/demos/effect/
$("#div_id").click(function() {
$(this).effect("shake", { times:3 }, 300, function(){
alert('hello');
});
}

$(this).effect("shake", { times:3 }, 300, function() {
alert('hello');
});