Vue组件在外部设置其值后将不会重新呈现数组项。声明状态,但v-for元素未显示更改。
我有一个从数组渲染项目的组件。我还具有用于更改数组长度的按钮,它可以很好地工作:“ +”添加一行,“-”删除最后一行。当我从获取方法设置数组数据时,问题就开始了。数据已显示,但“ +”和“-”按钮不起作用。
这是codesanbox https://codesandbox.io/s/q9jv524kvw
的链接/App.vue
<template>
<div id="app">
<button @click="downloadTemplate">Load data</button>
<HelloWorld :formData="formData" />
</div>
</template>
<script>
import HelloWorld from "./components/HelloWorld";
export default {
name: "App",
components: {
HelloWorld
},
data() {
return {
fakeData: {
unloadingContactPersons: [
{
id: this.idGen("unloadingContactPersons"),
value: "123"
},
{
id: this.idGen("unloadingContactPersons"),
value: "1234"
},
{
id: this.idGen("unloadingContactPersons"),
value: "12345"
}
]
},
lengthDependentLoadings: [
"loadingDates",
"loadingAddresses",
"loadingContactPersons"
],
lengthDependentUnloadings: [
"unloadingDates",
"unloadingAddresses",
"unloadingContactPersons"
],
formData: {
unloadingContactPersons: [
{
id: this.idGen("unloadingContactPersons"),
value: ""
}
]
}
};
},
methods: {
idGen(string = "") {
// Math.random should be unique because of its seeding algorithm.
// Convert it to base 36 (numbers + letters), and grab the first 9 characters
// after the decimal.
return (
string +
"_" +
Math.random()
.toString(36)
.substr(2, 9)
);
},
addLine(id) {
console.log("id", id);
const parentName = id.split("_")[0];
const dependentArray = this.lengthDependentLoadings.includes(parentName)
? this.lengthDependentLoadings
: this.lengthDependentUnloadings;
dependentArray.forEach(objName => {
this.formData[objName]
? this.formData[objName].push({
id: this.idGen(objName),
value: ""
})
: null;
});
console.log("--length", this.formData.unloadingContactPersons.length);
},
removeLine(id) {
const parentName = id.split("_")[0];
const dependentArray = this.lengthDependentLoadings.includes(parentName)
? this.lengthDependentLoadings
: this.lengthDependentUnloadings;
dependentArray.forEach(objName => {
this.formData[objName] ? this.formData[objName].pop() : null;
});
console.log("--length", this.formData.unloadingContactPersons.length);
},
downloadTemplate(link) {
// fake fetch request
const getFunctionDummy = data =>
new Promise(resolve => setTimeout(resolve.bind(null, data), 1500));
// data setter
getFunctionDummy(this.fakeData).then(result => {
// set our data according to the template data
const templateKeys = Object.keys(result);
const templateData = result;
this.formData = {};
templateKeys.forEach((key, index) => {
let value = templateData[key];
console.log(value);
if (Array.isArray(value)) {
console.log("array", value);
this.formData[key] = value.map((item, id) => {
console.log("---from-template", item);
return {
id: this.idGen(key),
value: item.value
};
});
} else {
this.formData[key] = {
id: this.idGen(key),
value
};
}
});
});
}
},
mounted() {
// takes id number of item to be added
this.$root.$on("addLine", ({ value }) => {
console.log("---from-mounted", value);
this.addLine(value);
});
// takes id number of item to be removed
this.$root.$on("removeLine", ({ value }) => {
this.removeLine(value);
});
},
beforeDestroy() {
this.$root.$off("addLine");
this.$root.$off("removeLine");
}
};
</script>
/HelloWorld.vue
<template>
<div class="hello">
<div class="form-item">
<div class="form-item__label">
<label :for="formData.unloadingContactPersons"
>Contact person on unload:</label
>
</div>
<div class="form-item__input multiline__wrapper">
<div
class="multiline__container"
@mouseover="handleMouseOver(unloadingContactPerson.id);"
v-for="unloadingContactPerson in formData.unloadingContactPersons"
:key="unloadingContactPerson.id"
>
<span
class="hover-button hover-button__remove"
@click="removeLine(unloadingContactPerson.id);"
><i class="fas fa-minus-circle fa-lg"></i>-</span
>
<input
class="multiline__input"
:id="unloadingContactPerson.id"
type="text"
v-model="unloadingContactPerson.value"
@input="emitFormData"
/>
<span
class="hover-button hover-button__add"
@click="addLine(unloadingContactPerson.id);"
><i class="fas fa-plus-circle fa-lg"></i>+</span
>
</div>
</div>
</div>
</div>
</template>
<script>
import Datepicker from "vuejs-datepicker";
import { uk } from "vuejs-datepicker/dist/locale";
export default {
name: "SubmitForm",
components: {
Datepicker
},
props: {
formData: Object
},
data: () => {
return {
uk,
hoveredItemId: null
};
},
methods: {
emitFormData() {
this.$root.$emit("submitFormData", { value: this.formData });
},
handleMouseOver(id) {
this.hoveredItemId = id;
},
addLine(id) {
// console.log("---add", id);
this.$root.$emit("addLine", {
value: id
});
},
removeLine(id) {
// console.log("---remove", id);
this.$root.$emit("removeLine", {
value: id
});
}
}
};
</script>
答案 0 :(得分:1)
只需评论npm install
npm ERR! Error while executing:
npm ERR! /usr/bin/git ls-remote -h -t https://myprivategit.com/my/repo
npm ERR!
npm ERR! remote: HTTP Basic: Access denied
npm ERR! fatal: Authentication failed for 'https://myprivategit.com/my/repo.git/'
npm ERR!
npm ERR! exited with error code: 128
中的line no 111
,它就会起作用。
App.vue
问题是您直接突变了Vue.js无法检测到的// this.formData = {}
对象。进一步了解Array Change detection [List Rendering - Vue.js]