Question

我有一个简单的代码，但是我（有时）收到错误的结果，这是由于NodeJS异步引起的。最后，我需要更新“ this.setState（{active：options}）”。因此，为了解决NodeJS的异步问题，我使用了require（“ async”）库。但是现在我的简单代码变得非常复杂，结果也不是100％良好。

当我使用“ this.setState（{actove：options}）”或“ this.setState（{actove：results.optionsFill}）”时，也在“功能之路”上，我收到错误消息：未处理的拒绝（TypeError）：无法读取未定义的属性'setState'和“未捕获（承诺）TypeError：无法读取未定义的属性'setState'”。

请参阅简单的开始代码（该代码计算输入到地图的图例，数字周期的arr）：

    setLegend(data){

        function roundingSize(number){
        }

        function rounding(number){
        }

        function stopsArrFill(jumpLegendValue, highestNumber){
        }

        // Searching for the highestNumber POPULATION
        var highestNumber = 0

        data.features.forEach(element => {
             var value = element.properties["POPULATION"]           
             if(highestNumber<value) highestNumber = value
        })

        // Need to round the number, so it will look nice on the legend
        highestNumber = roundingSize(highestNumber)

        // Searching for the LowestNumber POPULATION
        var LowestNumber = highestNumber

        data.features.forEach(element => {
            var value = element.properties["POPULATION"]
            if(LowestNumber>value) LowestNumber = value
        })

        // Need to round the number, so it will look nice on the legend
        LowestNumber = roundingSize(LowestNumber)

        // 7 because 1 element is 0 and the last is the highestNumber, so it gives 7 empty elements to fill
        var jumpLegendValue = Math.round(rounding((highestNumber - LowestNumber)/7))

        var tmpStops  = stopsArrFill(jumpLegendValue, highestNumber)

        const options = {
            name: 'Legenda',
            description: 'Liczba wystąpień',
            property: 'POPULATION',
            stops: tmpStops
        }

        this.setState({active: options})

现在使用async.auto编写复杂的代码：

    setLegend(data){

        function roundingSize(number){
        }

        function rounding(number){
        }

        function stopsArrFill(jumpLegendValue, highestNumber){
        }

        async.auto({

            highestNumber: function(callback){

                // Searching for the highestNumber POPULATION
                var highestNumber = 0

                data.features.forEach(element => {
                    var value = element.properties["POPULATION"]           
                    if(highestNumber<value) highestNumber = value
                })

                // Need to round the number, so it will look nice on the legend
                highestNumber = roundingSize(highestNumber)

                callback(null, highestNumber)
            },
            lowestNumber: ['highestNumber', function(results, callback){

                // Searching for the LowestNumber POPULATION
                var lowestNumber = results.highestNumber

                data.features.forEach(element => {
                    var value = element.properties["POPULATION"]
                    if(lowestNumber>value) lowestNumber = value
                })

                // Need to round the number, so it will look nice on the legend
                lowestNumber = roundingSize(lowestNumber)

                callback(null, lowestNumber)
            }],
            jumpLegendValue: ['highestNumber', 'lowestNumber', function(results, callback){

                // 7 because 1 element is 0 and the last is the highestNumber, so it gives 7 empty elements to fill
                var jumpLegendValue = Math.round(rounding((results.highestNumber - results.lowestNumber)/7))

                callback(null, jumpLegendValue)
            }],
            stopsArrFill:['highestNumber','jumpLegendValue', function(results, callback){

                // Filling the stops with jumpLegendValues
                var tmpStops  = stopsArrFill(results.jumpLegendValue, results.highestNumber)

                callback(null, tmpStops)
            }],
            optionsFill:['stopsArrFill', function(results, callback){

                const options = {
                    name: 'Legenda',
                    description: 'Liczba wystąpień',
                    property: 'POPULATION',
                    stops: results.stopsArrFill
                }      

                callback(null, options)
            }],
            function (err, results)
            {
                this.setState({active:results.optionsFill})
                console.log('error: ', err)
            }
        })

我现在玩了2天，您有什么想法/建议吗？我找不到与async.auto类似的setState用法。

Answer 1

要解决setState问题，您需要意识到async.auto（{}）是一个承诺。

最终的错误功能需要删除以下代码：

<record id="picking_view_inherit_duvan1" model="ir.ui.view">
        <field name="name">my.picking.custom2</field>
        <field name="model">stock.move</field>
        <field name="inherit_id" ref="stock.view_move_picking_tree"/>
        <field name="arch" type="xml">
           <xpath expr="//field[@name='product_id']" position="attributes">
             <attribute name="options">{'no_create_edit':True,'no_create':True,'no_open':True}</attribute>
           </xpath>
        </field>
</record>

，并在async.auto（{}）的末尾添加：

function (err, results)
{
    this.setState({active:results.optionsFill})
    console.log('error: ', err)
}

拒绝（TypeError）：无法读取未定义的属性“ setState”，未捕获（承诺）TypeError：无法读取未定义的属性“ setState”

1 个答案: