我正在VueJS中创建一个计算器应用程序以响应用户的选择。此应用程序没有后端,所有变量和数据都是前端的一部分。下拉选择的选项是在单个JSON定义中预定义的。我可以根据自己的需要随意重新定义/分割此JSON,它不是固定的。
用户故事是:
我已经尝试从第一个下拉列表中的选定值中加载第二个下拉列表,但是没有结果。
<select required id="porf_of_loading" name="porf_of_loading" v-model="selectedPortOfLoading">
<option value="" disabled selected>Choose loading port</option>
<option v-bind:value="portOfLoading.port" v-for="portOfLoading in portsOfLoading">{{ portOfLoading.port }}</option>
</select>
<label>PORT OF LOADING</label>
<select required id="final_destination" name="final_destination" v-model="selectedFinalDestination">
<option value="" disabled selected>Choose destination</option>
<option v-bind:value="finalDestination.value" v-for="finalDestination in selectedPortOfLoading.finalDestinations">{{ finalDestination[0] }}</option>
</select>
<label>FINAL DESTINATION</label>
data: {
selectedPortOfLoading: [],
selectedFinalDestination: [],
portsOfLoading: [{
port: 'Port 1',
finalDestinations: [
['Dest 1', 141],
['Dest 2', 141],
['Dest 3', 146],
['Dest 4', 140],
['Dest 5', 0]
],
tTime: 42,
aes: 0,
minCbm: 1
},
{
port: 'Port 2',
finalDestinations: [
['Dest 1', 145],
['Dest 2', 145],
['Dest 3', 149],
['Dest 4', 130],
['Dest 5', 0]
],
tTime: 26,
aes: 0,
minCbm: 1
},
{
port: 'Port 3',
finalDestinations: [
['Dest 1', 149],
['Dest 2', 149],
['Dest 3', 150],
['Dest 4', 142],
['Dest 5', 0]
],
tTime: 31,
aes: 0,
minCbm: 1
}
]
}
预期结果:
第一个下拉选项:
第二个下拉选项(在选择“端口1”的情况下:]
第二个下拉选项(选择“端口2”时:]
当前结果是,第二个下拉列表没有选项,只有第一个“选择目的地”。
您在selectedPortOfLoading
中分配给v-model
的值是端口的名称,因此您仅分配String
。但是第二个选择元素仍需要finalDestinations
属性。
我让您的示例通过使用根据端口名称查找数据的计算属性来工作:
<template>
<div>
<select required id="porf_of_loading" name="porf_of_loading" v-model="selectedPortOfLoading">
<option disabled selected>Choose loading port</option>
<option v-bind:value="portOfLoading.port" v-for="(portOfLoading, key) in portsOfLoading" :key="key">{{ portOfLoading.port }}</option>
</select>
<label>PORT OF LOADING</label>
<select required id="final_destination" name="final_destination" v-model="selectedFinalDestination">
<option value="" disabled selected>Choose destination</option>
<option v-bind:value="finalDestination[1]"
v-for="(finalDestination, key) in getPortsOfloading"
:key="key">
{{ finalDestination[0] }}
</option>
</select>
<label>FINAL DESTINATION</label>
</div>
</template>
<script>
export default {
name: "App",
data() {
return {
selectedPortOfLoading: [],
selectedFinalDestination: [],
portsOfLoading: [{
port: 'Port 1',
finalDestinations: [
['Dest 1', 141],
['Dest 2', 141],
['Dest 3', 146],
['Dest 4', 140],
['Dest 5', 0]
],
tTime: 42,
aes: 0,
minCbm: 1
},
{
port: 'Port 2',
finalDestinations: [
['Dest 1', 145],
['Dest 2', 145],
['Dest 3', 149],
['Dest 4', 130],
['Dest 5', 0]
],
tTime: 26,
aes: 0,
minCbm: 1
},
{
port: 'Port 3',
finalDestinations: [
['Dest 1', 149],
['Dest 2', 149],
['Dest 3', 150],
['Dest 4', 142],
['Dest 5', 0]
],
tTime: 31,
aes: 0,
minCbm: 1
}
]
}
},
computed: {
getPortsOfloading() {
if(!this.selectedPortOfLoading.length){
return [];
}
return this.portsOfLoading.find(p => p.port === this.selectedPortOfLoading).finalDestinations
}
}
};
</script>