jQuery / JavaScript模糊/焦点和设置超时

Question

When mouse is over a product number (focus) then show some product information. When user is not longer over a product number (blur), then wait 3 seconds, then hide details.

$('.productNumber').live('blur', function() {               
    setTimeout(function(){
    var divToPutData = $(this); 
    divToPutData.hide();
}, 3000);
});

Now user says that if user moves mouse back within those 5 seconds to stop the count down, until a blur event fires again. No sure how to do this with setTimeout.

Answer 1

Use clearTimeout()

var myTimeout = null;

$('.productNumber').live('mouseover', function() {  
    //If timeout is still active, clear
    if(myTimeout != null)
        clearTimeout(myTimeout);
});

$('.productNumber').live('blur', function() {
    //Store the ID returned by setTimeout
    myTimout = setTimeout(function(){ divToPutData.hide(); }, 3000);
});

Answer 2

Use the function clearTimeout.

setTimeout returns a numeric id, you can store it in a variable, and then pass it to the clearTimeout function:

var myTimeout = setTimeout ( function(){alert(2);}, 1000);
clearTimeout(myTimeout);

Answer 3

var t;
$('.productNumber').live('mouseover', function() {  
    clearTimeout(t);
});

$('.productNumber').live('mouseout', function() {               
    t = setTimeout(function(){
    divToPutData.hide();
}, 3000);
});

Answer 4

have the setTimeout assigned to a variable, so you can cancel it on hover again

var hideTimeout;
$('.productNumber').live('blur',function() {
    hideTimeout = setTimeout(function() {
        divToPutData.hide();
    }, 3000);
});
$('.productNumber').live('mouseover',function() {
    clearTimeout(hideTimeout);
    // Do the show stuff
}

• jQuery is not my strongest language, so you may need to modify this slightly, but this is the general approach to this scenario.

Answer 5

Use the jQuery stop() to abort any ongoing animation

Test it here: http://jsfiddle.net/T7kRr/1/

jQuery

$(".productNumber").hover(
  function () {
      $(this).find(".productDesc:last").stop(true, true).show();
  }, 
  function () {
      $(this).find(".productDesc:last").delay(3000).fadeOut(); 
  }
);

HTML

<div class="productNumber">1001<span class="productDesc" style="display:none">iPhone</span></div>
<div class="productNumber">2001<span class="productDesc" style="display:none">iPad</span></div>
<div class="productNumber">3333<span class="productDesc" style="display:none">TV</span></div>
<div class="productNumber">9999<span class="productDesc" style="display:none">HiFi</span></div>