How to delay the Execution of a Javascript Function After a Live Keyup event is called?

问题

Hey programmers, I have removed everything from my function below to just target exactly what I need help with...

After the keyup event is called, the reloadContent function will make an ajax call to gather new data from a database.

Only problem is, my servers are overloading because there is no delay from the keyup events, after every keyup the function is called.

I need a way to delay, say 1 second, before the reloadContent function is called. This way it will not run 4 times (when the user types in j o h n) but only 1 time after the user types (john), assuming they can type more than 1 character/sec.

$('#searchinput').live('keyup',function() {

        reloadContent(); //execute load function

});

Any advice is appreciated

回答1:

You can set a timeout in your keyup handler and use jQuery's data() facility to associate its id with the element. That way, if the keyup event is triggered again before the delay runs out, you can clear the existing timeout and schedule a new one:

$("#searchinput").live("keyup", function() {
    var $this = $(this);
    var timerId = $this.data("timerId");
    if (timerId) {
        window.clearTimeout(timerId);
    }
    $this.data("timerId", window.setTimeout(reloadContent, 1000));
});

回答2:

$('#searchinput').live('keyup',function() {
    window.setTimeout(function(){
        reloadContent(); //execute load function
    },1000);
});

This will make a delay, but I think you need not only delay to make what you want.

来源：https://stackoverflow.com/questions/6166213/how-to-delay-the-execution-of-a-javascript-function-after-a-live-keyup-event-is