first unbind click and then bind (jquery)

问题:

1.I have a onclick event on,

$('#locations').click(function(){
$('#train').unbind('click'); 
//do some stuff
}

2.Once the close button is clicked

$('.close').click(function(){
//do some stuff
}

3.Then again if I click #train

$('#train').bind('click', function() {
alert('train is clicked');
//do some stuff
}

Now the problem is #train is not firing.Is it to bind the event again on .close function?

Please suggest.Thanks in advance.

回答1:

Looking at your question, you dont seem to bind back the click after you unbind it, so it wont fire. (Assuming you've kept the sequence of your functionality right). You'll have to do it this way:

//Set a function with the action you need to do after you click the train
function  trainClick() {
  alert('train is clicked');
  //do some stuff
}

When you're unbinding, call unbind with the function name:

$('#locations').click(function(){
 $('#train').unbind('click',trainClick);
//do some stuff
}

Then, to bind the click (when #close is clicked), you'd use :

$('.close').click(function(){
  $('#train').bind('click',trainClick);
  //do some stuff
}

NOTE :

A better way would be use on and off, if youre using a version greater than jQuery v1.7 because, well.. it wont work. In the code above, just replace bind with on and unbind with off.

$('#train').on('click',trainClick);
$('#train').off('click',trainClick);

Hope this helps!

回答2:

BINDING AND UNBINDING HANDLERS

The Key is Scope.

You must declare and define the function (trainClick(){stuff it does}) outside the event-handler so that the other buttons' functions can see it.

Below is an example.

function trainClick()
{
    alert("train is clicked"); //Notice this function is declared outside event handlers below
}
$('#button1').on("click", trainClick); //this calls the above function

$("#button2").on("click",function(){
    $("#button1").off("click",trainClick); //unbinds button1 from trainClick() function (event handler)
});//End Button 2 click

$("#button3").on("click",function(){
    $("#button1").on("click",trainClick); //binds button1 to trainClick() function (event handler)
});//End Button 2 click