Mar*_*oVW 38 javascript oop jquery
我正在开发一个可以向用户展示调查的应用程序.标记看起来像这样:
<body>
<div class="question" id="q1">
Question 1
</div>
<div class="question" id="q2">
Question 2
</div>
<!-- etc -->
</body>
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我想从使用jQuery的DOM构建JavaScript对象,所以在Survey构造函数中,我穿越了jQuery使用设置each()方法.问题是在回调函数中我无法获得Survey对象的引用,以便将每个Question对象附加到Survey.questions数组.如何获得Survey对象的引用?有没有办法将附加参数(例如Survey对象的引用)传递给回调函数?
function Survey() {
this.questions = new Array;
$('.question').each(function(i) { (/* Survey object */).questions.push(new Question(this)); });
}
function Question(element) {
this.element = $(element);
}
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Mar*_*man 33
在迭代问题之前,您应该能够创建对调查的引用.
function Survey() {
this.questions = new Array();
var survey = this;
$('.question').each(function(i) {
survey.questions.push(new Question(this));
});
}
function Question(element) {
this.element = $(element);
}
var survey = new Survey();
$.each(survey.questions, function() {
$("ul").append("<li>" + this.element.text() + "</li>");
});
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关于jsfiddle的工作示例
dek*_*dev 18
虽然这可能不是相关的答案,但是问题是如何将参数传递给jQuery各个函数.
var param = 'extra-param';
var partial = function(fn, var_args) {
var args = Array.prototype.slice.call(arguments, 1);
return function() {
// Clone the array (with slice()) and append additional arguments
// to the existing arguments.
var newArgs = args.slice();
newArgs.push.apply(newArgs, arguments);
return fn.apply(this, newArgs);
};
};
$(['joe','james','rick','kirk']).each(partial (function (index,value) {
alert(arguments.length);
alert(arguments[0]);
},param));
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第二种方法是
$ .each函数可以采用2个参数Index和Element(也可以称为this)OR或者如果你不需要Index那么你可以将Array参数作为参数传递给$ .each并且元素可以作为这个引用
注意:args仅供内部使用 - 由jQuery提供
// Execute a callback for every element in the matched set.
// (You can seed the arguments with an array of args, but this is
// only used internally.)
each: function( callback, args ) {
return jQuery.each( this, callback, args );
},
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哪个会打电话 each: function( obj, callback, args )
callback.apply( obj[ i ], args );如果你传递数组作为参数,则调用 callback.call( obj[ i ], i, obj[ i ] );
请注意申请和电话的区别
示例代码:http://jsfiddle.net/dekajp/yA89R/1/
var param = 'rick';
$(['joe','james','rick','kirk']).each(function (arg1 , arg2 ,arg3) {
//alert('[this: '+this +'] [arg1: '+ arg1 +'] [arg2:'+arg2+'] [param:'+param+']');
},['hello 1','hello 2','hello 3']);
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参考jQuery每个代码版本1.9
// args is for internal usage only
each: function( obj, callback, args ) {
var value,
i = 0,
length = obj.length,
isArray = isArraylike( obj );
if ( args ) {
if ( isArray ) {
for ( ; i < length; i++ ) {
value = callback.apply( obj[ i ], args );
if ( value === false ) {
break;
}
}
} else {
for ( i in obj ) {
value = callback.apply( obj[ i ], args );
if ( value === false ) {
break;
}
}
}
// A special, fast, case for the most common use of each
} else {
if ( isArray ) {
for ( ; i < length; i++ ) {
value = callback.call( obj[ i ], i, obj[ i ] );
if ( value === false ) {
break;
}
}
} else {
for ( i in obj ) {
value = callback.call( obj[ i ], i, obj[ i ] );
if ( value === false ) {
break;
}
}
}
}
return obj;
},
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Oli*_*oyo 10
我遇到了类似的问题.将param传递给每个函数:
var param1 = "one";
var param2 = "two";
var params = [ param1, param2 ];
$( '#myTable > tbody > tr' ).each(function( index ) {
var param1back = params[0];
var param2back = params[1];
},params);
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