JavaScript / JQuery:$(window).resize调整大小完成后如何触发?

2020/10/11 11:41 · javascript ·  · 0评论

我这样使用JQuery:

$(window).resize(function() { ... });

但是,看来,如果该人通过拖动窗口边缘以使其更大或更小来手动调整其浏览器窗口的大小,则.resize上面事件会触发多次。

问题:浏览器窗口调整大小完成后如何调用函数(以便事件仅触发一次)?

这是CMS解决方案的修改,可以在您的代码中的多个地方调用:

var waitForFinalEvent = (function () {
  var timers = {};
  return function (callback, ms, uniqueId) {
    if (!uniqueId) {
      uniqueId = "Don't call this twice without a uniqueId";
    }
    if (timers[uniqueId]) {
      clearTimeout (timers[uniqueId]);
    }
    timers[uniqueId] = setTimeout(callback, ms);
  };
})();

用法:

$(window).resize(function () {
    waitForFinalEvent(function(){
      alert('Resize...');
      //...
    }, 500, "some unique string");
});

CMS的解决方案很好,如果您只调用一次,但是如果您多次调用它,例如,如果代码的不同部分为窗口大小调整设置了单独的回调,则它们将无法共享timer变量。

通过此修改,您可以为每个回调提供唯一的ID,并且这些唯一的ID用于将所有超时事件分开。

我更喜欢创建一个事件:

$(window).bind('resizeEnd', function() {
    //do something, window hasn't changed size in 500ms
});

创建方法如下:

 $(window).resize(function() {
        if(this.resizeTO) clearTimeout(this.resizeTO);
        this.resizeTO = setTimeout(function() {
            $(this).trigger('resizeEnd');
        }, 500);
    });

您可以将其保存在某个全局javascript文件中。

我使用以下函数来延迟重复的操作,它将适合您的情况:

var delay = (function(){
  var timer = 0;
  return function(callback, ms){
    clearTimeout (timer);
    timer = setTimeout(callback, ms);
  };
})();

用法:

$(window).resize(function() {
    delay(function(){
      alert('Resize...');
      //...
    }, 500);
});

传递给它的回调函数仅在指定的时间量后最后一次调用延迟时才执行,否则将重置计时器,我发现这对其他目的很有用,例如检测用户何时停止键入等。 ..

如果安装了Underscore.js,则可以:

$(window).resize(_.debounce(function(){
    alert("Resized");
},500));

某些先前提到的解决方案即使对我来说更通用,但对我却不起作用。另外,我发现这是在调整窗口大小的工作:

$(window).bind('resize', function(e){
    window.resizeEvt;
    $(window).resize(function(){
        clearTimeout(window.resizeEvt);
        window.resizeEvt = setTimeout(function(){
        //code to do after window is resized
        }, 250);
    });
});

非常感谢David Walsh,这是下划线去抖动的原始版本。

码:

// Returns a function, that, as long as it continues to be invoked, will not
// be triggered. The function will be called after it stops being called for
// N milliseconds. If `immediate` is passed, trigger the function on the
// leading edge, instead of the trailing.
function debounce(func, wait, immediate) {
    var timeout;
    return function() {
        var context = this, args = arguments;
        var later = function() {
            timeout = null;
            if (!immediate) func.apply(context, args);
        };
        var callNow = immediate && !timeout;
        clearTimeout(timeout);
        timeout = setTimeout(later, wait);
        if (callNow) func.apply(context, args);
    };
};

简单用法:

var myEfficientFn = debounce(function() {
    // All the taxing stuff you do
}, 250);

$(window).on('resize', myEfficientFn);

参考:http : //davidwalsh.name/javascript-debounce-function

实际上,据我所知,仅当您不知道未来用户的操作时,才能在关闭调整大小后无法完全执行某些操作。但是您可以假设两个调整大小事件之间经过的时间,因此,如果您等待的时间超过此时间,并且没有进行任何调整大小,则可以调用函数。

想法是,我们使用
setTimeout及其ID来保存或删除它。例如,我们知道两个调整大小事件之间的时间为500毫秒,因此我们将等待750毫秒。

var a;
$(window).resize(function(){
  clearTimeout(a);
  a = setTimeout(function(){
    // call your function
  },750);
});

声明全局延迟的侦听器:

var resize_timeout;

$(window).on('resize orientationchange', function(){
    clearTimeout(resize_timeout);

    resize_timeout = setTimeout(function(){
        $(window).trigger('resized');
    }, 250);
});

下面根据需要使用侦听器进行resized事件:

$(window).on('resized', function(){
    console.log('resized');
});

这个对我有用。
查看此解决方案
-https://alvarotrigo.com/blog/firing-resize-event-only-once-when-resizing-is-finished/

var resizeId;
$(window).resize(function() {
    clearTimeout(resizeId);
    resizeId = setTimeout(doneResizing, 500);
});
function doneResizing(){
    //whatever we want to do 
}

简单的jQuery插件,用于延迟窗口调整大小事件。

句法:

添加新功能以调整事件大小

jQuery(window).resizeDelayed( func, delay, id ); // delay and id are optional

删除先前添加的功能(通过声明其ID)

jQuery(window).resizeDelayed( false, id );

删除所有功能

jQuery(window).resizeDelayed( false );

用法:

// ADD SOME FUNCTIONS TO RESIZE EVENT
jQuery(window).resizeDelayed( function(){ console.log( 'first event - should run after 0.4 seconds'); }, 400,  'id-first-event' );
jQuery(window).resizeDelayed( function(){ console.log('second event - should run after 1.5 seconds'); }, 1500, 'id-second-event' );
jQuery(window).resizeDelayed( function(){ console.log( 'third event - should run after 3.0 seconds'); }, 3000, 'id-third-event' );

// LETS DELETE THE SECOND ONE
jQuery(window).resizeDelayed( false, 'id-second-event' );

// LETS ADD ONE WITH AUTOGENERATED ID(THIS COULDNT BE DELETED LATER) AND DEFAULT TIMEOUT (500ms)
jQuery(window).resizeDelayed( function(){ console.log('newest event - should run after 0.5 second'); } );

// LETS CALL RESIZE EVENT MANUALLY MULTIPLE TIMES (OR YOU CAN RESIZE YOUR BROWSER WINDOW) TO SEE WHAT WILL HAPPEN
jQuery(window).resize().resize().resize().resize().resize().resize().resize();

使用输出:

first event - should run after 0.4 seconds
newest event - should run after 0.5 second
third event - should run after 3.0 seconds

插入:

jQuery.fn.resizeDelayed = (function(){

    // >>> THIS PART RUNS ONLY ONCE - RIGHT NOW

    var rd_funcs = [], rd_counter = 1, foreachResizeFunction = function( func ){ for( var index in rd_funcs ) { func(index); } };

    // REGISTER JQUERY RESIZE EVENT HANDLER
    jQuery(window).resize(function() {

        // SET/RESET TIMEOUT ON EACH REGISTERED FUNCTION
        foreachResizeFunction(function(index){

            // IF THIS FUNCTION IS MANUALLY DISABLED ( by calling jQuery(window).resizeDelayed(false, 'id') ),
            // THEN JUST CONTINUE TO NEXT ONE
            if( rd_funcs[index] === false )
                return; // CONTINUE;

            // IF setTimeout IS ALREADY SET, THAT MEANS THAT WE SHOULD RESET IT BECAUSE ITS CALLED BEFORE DURATION TIME EXPIRES
            if( rd_funcs[index].timeout !== false )
                clearTimeout( rd_funcs[index].timeout );

            // SET NEW TIMEOUT BY RESPECTING DURATION TIME
            rd_funcs[index].timeout = setTimeout( rd_funcs[index].func, rd_funcs[index].delay );

        });

    });

    // <<< THIS PART RUNS ONLY ONCE - RIGHT NOW

    // RETURN THE FUNCTION WHICH JQUERY SHOULD USE WHEN jQuery(window).resizeDelayed(...) IS CALLED
    return function( func_or_false, delay_or_id, id ){

        // FIRST PARAM SHOULD BE SET!
        if( typeof func_or_false == "undefined" ){

            console.log( 'jQuery(window).resizeDelayed(...) REQUIRES AT LEAST 1 PARAMETER!' );
            return this; // RETURN JQUERY OBJECT

        }

        // SHOULD WE DELETE THE EXISTING FUNCTION(S) INSTEAD OF CREATING A NEW ONE?
        if( func_or_false == false ){

            // DELETE ALL REGISTERED FUNCTIONS?
            if( typeof delay_or_id == "undefined" ){

                // CLEAR ALL setTimeout's FIRST
                foreachResizeFunction(function(index){

                    if( typeof rd_funcs[index] != "undefined" && rd_funcs[index].timeout !== false )
                        clearTimeout( rd_funcs[index].timeout );

                });

                rd_funcs = [];

                return this; // RETURN JQUERY OBJECT

            }
            // DELETE ONLY THE FUNCTION WITH SPECIFIC ID?
            else if( typeof rd_funcs[delay_or_id] != "undefined" ){

                // CLEAR setTimeout FIRST
                if( rd_funcs[delay_or_id].timeout !== false )
                    clearTimeout( rd_funcs[delay_or_id].timeout );

                rd_funcs[delay_or_id] = false;

                return this; // RETURN JQUERY OBJECT

            }

        }

        // NOW, FIRST PARAM MUST BE THE FUNCTION
        if( typeof func_or_false != "function" )
            return this; // RETURN JQUERY OBJECT

        // SET THE DEFAULT DELAY TIME IF ITS NOT ALREADY SET
        if( typeof delay_or_id == "undefined" || isNaN(delay_or_id) )
            delay_or_id = 500;

        // SET THE DEFAULT ID IF ITS NOT ALREADY SET
        if( typeof id == "undefined" )
            id = rd_counter;

        // ADD NEW FUNCTION TO RESIZE EVENT
        rd_funcs[id] = {
            func : func_or_false,
            delay: delay_or_id,
            timeout : false
        };

        rd_counter++;

        return this; // RETURN JQUERY OBJECT

    }

})();

假设在窗口调整大小后鼠标光标应返回到文档,我们可以使用onmouseover事件创建类似回调的行为。不要忘记,此解决方案可能无法按预期用于支持触摸屏的屏幕。

var resizeTimer;
var resized = false;
$(window).resize(function() {
   clearTimeout(resizeTimer);
   resizeTimer = setTimeout(function() {
       if(!resized) {
           resized = true;
           $(document).mouseover(function() {
               resized = false;
               // do something here
               $(this).unbind("mouseover");
           })
       }
    }, 500);
});

这是我实现的:

$(window).resize(function(){setTimeout(someFunction,500);});

如果我们希望调整大小小于以下时间,则可以清除setTimeout500ms

祝好运...

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