Question

在textarea中启动输入暂停时，我用它来触发一个函数：

var keyTimer;

$("#TEXTAREA").on('keyup mouseup', function(){

if (keyTimer) {
clearTimeout(keyTimer);
}
keyTimer = setTimeout(function () {
doFunction(); // Not working, triggers only once (on focus).
}, 500);

});

doFunction（）仅在第一次键盘暂停（焦点上）时触发。该功能必须在每次暂停时触发（500）。现在我需要模糊TEXTAREA，然后再次关注它以重新激活对我来说无用的doFunction（）。非常感谢任何解决方案。

更新：

更新了代码：

var keyTimer;

$("#TEXAREA").on('keyup mouseup', function(){

if (keyTimer) {
clearTimeout(keyTimer);
}
keyTimer = setTimeout(function () { 
doFunction(); // Formulates a string
$("#TEXAREA").trigger('change');
}, 500);

}).on('change', function(){

alert('test'); // This triggers at every keyup/mouseup delay (500)

// This section of code must work after delay (500), but it doesn't,
// it only works on Textarea blur, which is not what I want:

var txtarea = $(this);
var livecount = $("#myValue").val(); // Comes from doFunction()
if ( livecount.length > 2800 ) {
txtarea.css('color','#C00'); // Change text color of textarea
} else if ( livecount.length <= 2800 ) {
txtarea.css('color','#000'); // Change text color of textarea
}

});

Answer 1

看起来你的代码中唯一想到的是你在doFunction中使用的选择器。您正在使用#myValue但实际上正在寻找#TEXTAREA内部的值。这是我的jsfiddle

function doFunction(){
    console.log('not a test')
}

var keyTimer;

$("#TEXAREA").on('keyup mouseup', function(){

    if (keyTimer) {
        clearTimeout(keyTimer);
    }

    keyTimer = setTimeout(function () { 
        doFunction(); // Formulates a string
        $("#TEXAREA").trigger('change');
    }, 1000);

    }).on('change', function(){

    console.log('test'); // This triggers at every keyup/mouseup delay (500)

    // This section of code must work after delay (500), but it doesn't,
    // it only works on Textarea blur, which is not what I want:

    var txtarea = $(this);
    var livecount = $("#TEXAREA").val(); // Comes from doFunction()
    if ( livecount.length > 2800 ) {
        txtarea.css('color','#C00'); // Change text color of textarea
    } else if ( livecount.length <= 2800 ) {
        txtarea.css('color','#f00'); // Change text color of textarea
    }

});

Answer 2

更新 - 最终

好的，最后让它工作了：

var keyTimer;

$("#TEXTAREA").on('keyup mouseup', function(){

$(this).change(); // Need this to update keyboard character input

}).on('change', function(){

if (keyTimer) {
clearTimeout(keyTimer);
}

keyTimer = setTimeout(function () {

doFunction(); // Formulates a string

}, 200); // Delay before doFunction() so it won't slow down keyboard input

var livecount = $("#myValue"); // String value from doFunction()
if ( livecount.val().length > 2800 ) {
$(this).css('color','red'); // Change textarea text color to red for overlimit
} else if ( livecount.val().length <= 2800 ) {
$(this).css('color','black'); // Change textarea text color to black for within limit
}

});

这是漫长的一天; - ）

jQuery 2.1 |在textarea中延迟后触发功能

2 个答案: