我下面的示例可以工作，但它不是模块化的，通过硬编码的“switch”语句确定我的函数数组中存在多少个函数。
我试图弄清楚如何使用 forEach() 和 every() 但在将参数传递到数组中包含的函数中时遇到了麻烦。 (至少这是我目前的假设......
以下内容不起作用？
_this.oData.forEach(function (oRow) {
function foo(checksArray) {
var meetsAll = fc.every(function (func,oRow) {
return func(oRow);
});
console.log(meetsAll);
if (meetsAll){
_this.oFiltered.push(oRow);
};
};
});
这是一个完整的工作示例，但不正确，因为不是模块化的。
_this = this;
// sample data
_this.oData = [
{ 'itemfk': 123, 'vdrfk': 24 },
{ 'itemfk': 13, 'vdrfk': 34 },
{ 'itemfk': 18, 'vdrfk': 77 },
{ 'itemfk': 13, 'vdrfk': 24 },
{ 'itemfk': 48, 'vdrfk': 34 }
];
_this.oItemsSelected = [
{ 'itemfk': 123 },
{ 'itemfk': 13 }
];
_this.oVendorsSelected = [
{ 'vdrfk': 234 },
{ 'vdrfk': 24 }
];
// called by cascading controls
this.filterConditions = function () {
// build test conditions into array of functions
var fc = [];
// items condition
if (_this.oItemsSelected.length > 0) {
fc.push(
function (oRow) {
for (var nItem = 0; nItem < _this.oItemsSelected.length; nItem++) {
//console.log(_this.oItemsSelected[nItem].itemname +' row '+ oRow.itemname);
if (_this.oItemsSelected[nItem].itemfk === oRow.itemfk) {
return true;
}
};
return false;
}
);
};
// vendors condition
if (_this.oVendorsSelected.length > 0) {
fc.push(
function (oRow) {
for (var nVendor = 0; nVendor < _this.oVendorsSelected.length; nVendor++) {
if (_this.oVendorsSelected[nVendor].vdrfk === oRow.vdrfk) {
return true;
}
};
return false;
}
);
};
// loop data and apply conditions
_this.oFiltered = [];
_this.oData.forEach(function (oRow) {
switch (fc.length) {
case 1:
if (fc[0](oRow)) {
_this.oFiltered.push(oRow);
};
break;
case 2:
if (fc[0](oRow) && fc[1](oRow)) {
_this.oFiltered.push(oRow);
};
break;
};
});
// two oData rows (index zero and three) match conditions
console.log(_this.oFiltered);
};
如有任何帮助，我们将不胜感激!
_this = this;
// sample data
_this.oData = [
{ 'itemfk': 123, 'vdrfk': 24 },
{ 'itemfk': 13, 'vdrfk': 34 },
{ 'itemfk': 18, 'vdrfk': 77 },
{ 'itemfk': 13, 'vdrfk': 24 },
{ 'itemfk': 48, 'vdrfk': 34 }
];
_this.oItemsSelected = [
{ 'itemfk': 123 },
{ 'itemfk': 13 }
];
_this.oVendorsSelected = [
{ 'vdrfk': 234 },
{ 'vdrfk': 24 }
];
// called by cascading controls
this.filterConditions = function () {
// build test conditions into array of functions
var fc = [];
// items condition
if (_this.oItemsSelected.length > 0) {
fc.push(
function (oRow) {
for (var nItem = 0; nItem < _this.oItemsSelected.length; nItem++) {
//console.log(_this.oItemsSelected[nItem].itemname +' row '+ oRow.itemname);
if (_this.oItemsSelected[nItem].itemfk === oRow.itemfk) {
return true;
}
};
return false;
}
);
};
// vendors condition
if (_this.oVendorsSelected.length > 0) {
fc.push(
function (oRow) {
for (var nVendor = 0; nVendor < _this.oVendorsSelected.length; nVendor++) {
if (_this.oVendorsSelected[nVendor].vdrfk === oRow.vdrfk) {
return true;
}
};
return false;
}
);
};
// loop data and apply conditions
_this.oFiltered = [];
_this.oData.forEach(function (oRow) {
switch (fc.length) {
case 1:
if (fc[0](oRow)) {
_this.oFiltered.push(oRow);
};
break;
case 2:
if (fc[0](oRow) && fc[1](oRow)) {
_this.oFiltered.push(oRow);
};
break;
};
});
// two oData rows (index zero and three) match conditions
console.log(_this.oFiltered);
};<html>
<head>
<title></title>
<meta charset="utf-8" />
<script src="https://stacksnippets.net/js"></script>
</head>
<body onload="filterConditions()">
</body>
</html>最佳答案
使用Array.prototype.every()的方式是这样的:
_this.oFiltered = _this.oData.filter(function (oRow) {
return fc.every(function(func) {
return func(oRow);
});
});
如果你替换这个:
// loop data and apply conditions
_this.oFiltered = [];
_this.oData.forEach(function (oRow) {
switch (fc.length) {
case 1:
if (fc[0](oRow)) {
_this.oFiltered.push(oRow);
};
break;
case 2:
if (fc[0](oRow) && fc[1](oRow)) {
_this.oFiltered.push(oRow);
};
break;
};
});
将代码片段放在这个答案之上，就完成了。
<小时/>我冒昧地在以下代码片段中对您的脚本进行了一些修改 - 使用 closure还有更多Array.prototype.*方法。这可能会有点令人困惑，但也许其中有一些有用/有趣的东西:)
_this = {};
_this.oData = [{'itemfk':123,'vdrfk':24},{'itemfk':13,'vdrfk':34},{'itemfk':18,'vdrfk':77},{'itemfk':13,'vdrfk':24},{'itemfk':48,'vdrfk':34}];
_this.oItemsSelected = [{'itemfk':123},{'itemfk':13}];
_this.oVendorsSelected = [{'vdrfk':234},{'vdrfk':24}];
function createFilterFunction( /* conditions */ ) {
var conditions = Array.prototype.slice.apply(arguments), // convert <arguments> into a real array so we can use <Array.prototype.map()>
fc = conditions.map(function(condition) {
// we create a new function for each "condition" passed as parameter
return function(row) {
// <Array.prototype.some()> returns true if one of the items in the array fulfills the predicate
return condition.data.some(function(item) {
return item[condition.key] === row[condition.key];
});
};
});
// the "actual" function to filter the passed data
return function(dataToFilter) {
return dataToFilter.filter(function(data) {
// here we call every filter function in <fc> with every element in <dataToFilter> until one of the elements doesn't fulfill the predicate
return fc.every(function(func) {
return func(data);
})
});
};
}
// setup the function to filter the data
var filterConditions = createFilterFunction(
// <data> = items for comparison
// <key> = name of the property whose value should be compared
{ data: _this.oItemsSelected, key: "itemfk" }
,{ data: _this.oVendorsSelected, key: "vdrfk" }
// third condition
// fourth condition
// ...
);
var filteredConditions = filterConditions(_this.oData);
console.log(JSON.stringify(filteredConditions));关于javascript - arrayOfFunctions.ForEach( Func.Every( 将参数传递到数组函数中) )，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/46896129/