javascript - need to show alert when i scroll down a certain div in html - Stack Overflow

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i have a div in the middle of body tag

<div id="place">

</div>

what i want to do is, when i scroll down and e across the div with id "place", i want to show an alert.the logic i set is when the window scroll postion is greater than the div from the window top , i execute alert . i know that my logic is stupid ! but i want to learn how to do this .

what i have tried so far

$(window).scroll(function(){

                var toElement = $("#place").position(); 
                if(scroll.positon() > toElement){
                        alert("hello");
                    }
            });

i am new to jquery, so could you help me

i have a div in the middle of body tag

<div id="place">

</div>

what i want to do is, when i scroll down and e across the div with id "place", i want to show an alert.the logic i set is when the window scroll postion is greater than the div from the window top , i execute alert . i know that my logic is stupid ! but i want to learn how to do this .

what i have tried so far

$(window).scroll(function(){

                var toElement = $("#place").position(); 
                if(scroll.positon() > toElement){
                        alert("hello");
                    }
            });

i am new to jquery, so could you help me

• javascript
• jquery

Share Improve this question Follow edited Mar 14, 2014 at 4:59 Sahil Mittal 20.8k1212 gold badges6868 silver badges9191 bronze badges asked Aug 16, 2013 at 10:44 Wang'l PakhrinWang'l Pakhrin 86833 gold badges1616 silver badges3131 bronze badges 1

• possible duplicate: stackoverflow./questions/8554580/… – DevlshOne Commented Aug 16, 2013 at 10:47

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2 Answers 2

Sorted by: Reset to default 3

Try this:

$(window).scroll(function() {
    var offset = $("#place").offset().top;

    if ($(window).scrollTop() >= offset) {
        alert("hello");
    }
});

You can trigger an event from your script after you have made the div visible using the .trigger function

e.g

//declare event to run when div is visible
function isVisible(){
   alert("hi");
}

//hookup event
$('#place').bind('isVisible', isVisible);

//show div and trigger custom event in callback when div is visible
$('#place').show('slow', function(){
    $(this).trigger('isVisible');
});

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