我有一个对象属性，该属性可以侦听用户输入或可以通过视图进行更改。 与下面的片段：
widget.Title.Name也将更新。widget.Title.Name将被更新，但上面字段中的值不会被更新。预期结果：widget.Title.Name更改时，需要同时更新可编辑文本的值。
我不明白为什么不进行更新，如果我在vue检查器中检查属性，则所有字段（widget.Title.Name和Value）都将正确更新，但是html不会更新。
Vue.component('editable-text', {
template: '#editable-text-template',
props: {
value: {
type: String,
default: '',
},
contenteditable: {
type: Boolean,
default: true,
},
},
computed: {
listeners() {
return { ...this.$listeners, input: this.onInput };
},
},
mounted() {
this.$refs["editable-text"].innerText = this.value;
},
methods: {
onInput(e) {
this.$emit('input', e.target.innerText);
}
}
});
var vm = new Vue({
el: '#app',
data: {
widget: {
Title: {
Name: ''
}
}
},
async created() {
this.widget.Title.Name = "toto"
},
methods: {
externalChange: function () {
this.widget.Title.Name = "changed title";
},
}
})button{
height:50px;
width:100px;
}<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/vue/2.5.17/vue.js"></script>
<div id="app">
<editable-text v-model="widget.Title.Name"></editable-text>
<template>Name : {{widget.Title.Name}}</template>
<br>
<br>
<button v-on:click="externalChange">External update</button>
</div>
<template id="editable-text-template">
<p ref="editable-text" v-bind:contenteditable="contenteditable"
v-on="listeners">
</p>
</template>
我搜索了很多有关类似问题的主题，但是它们有反应性问题，我认为我在输入方面存在特定问题。您知道发生了什么吗？我试图添加一个监听器来更改事件，但是它没有在widget.Title.Name更改时触发。
答案 0 :(得分：0)
对于第三点：在输入开始时，更改widget.Title.Name的值时，组件将重新渲染，并且插入标记的位置将重新初始化为0。因此，您需要在最后一个位置重新更新它，否则您将只从右向左书写。
我已经用我的最终解决方案更新了上面的代码段。 我希望这会对其他来这里的人有所帮助。
Vue.component('editable-text', {
template: '#editable-text-template',
props: {
value: {
type: String,
default: '',
},
contenteditable: {
type: Boolean,
default: true,
},
},
//Added watch value to watch external change <-> enter here by user input or when component or vue change the watched property
watch: {
value: function (newVal, oldVal) { // watch it
// _.debounce is a function provided by lodash to limit how
// often a particularly expensive operation can be run.
// In this case, we want to limit how often we update the dom
// we are waiting for the user finishing typing his text
const debouncedFunction = _.debounce(() => {
this.UpdateDOMValue();
}, 1000); //here your declare your function
debouncedFunction(); //here you call it
//not you can also add a third argument to your debounced function to wait for user to finish typing, but I don't really now how it works and I didn't used it.
}
},
computed: {
listeners() {
return { ...this.$listeners, input: this.onInput };
},
},
mounted() {
this.$refs["editable-text"].innerText = this.value;
},
methods: {
onInput(e) {
this.$emit('input', e.target.innerText);
},
UpdateDOMValue: function () {
// Get caret position
if (window.getSelection().rangeCount == 0) {
//this changed is made by our request and not by the user, we
//don't have to move the cursor
this.$refs["editable-text"].innerText = this.value;
} else {
let selection = window.getSelection();
let index = selection.getRangeAt(0).startOffset;
//with this line all the input will be remplaced, so the cursor of the input will go to the
//beginning... and you will write right to left....
this.$refs["editable-text"].innerText = this.value;
//so we need this line to get back the cursor at the least position
setCaretPosition(this.$refs["editable-text"], index);
}
}
}
});
var vm = new Vue({
el: '#app',
data: {
widget: {
Title: {
Name: ''
}
}
},
async created() {
this.widget.Title.Name = "toto"
},
methods: {
externalChange: function () {
this.widget.Title.Name = "changed title";
},
}
})
/**
* Set caret position in a div (cursor position)
* Tested in contenteditable div
* @@param el : js selector to your element
* @@param caretPos : index : exemple 5
*/
function setCaretPosition(el, caretPos) {
var range = document.createRange();
var sel = window.getSelection();
if (caretPos > el.childNodes[0].length) {
range.setStart(el.childNodes[0], el.childNodes[0].length);
}
else
{
range.setStart(el.childNodes[0], caretPos);
}
range.collapse(true);
sel.removeAllRanges();
}button{
height:50px;
width:100px;
}<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.15/lodash.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/vue/2.5.17/vue.js"></script>
<div id="app">
<editable-text v-model="widget.Title.Name"></editable-text>
<template>Name : {{widget.Title.Name}}</template>
<br>
<br>
<button v-on:click="externalChange">External update</button>
</div>
<template id="editable-text-template">
<p ref="editable-text" v-bind:contenteditable="contenteditable"
v-on="listeners">
</p>
</template>
答案 1 :(得分：0)
您可以使用$ root。$ children [0]
Vue.component('editable-text', {
template: '#editable-text-template',
props: {
value: {
type: String,
default: '',
},
contenteditable: {
type: Boolean,
default: true,
},
},
computed: {
listeners() {
return {...this.$listeners, input: this.onInput
};
},
},
mounted() {
this.$refs["editable-text"].innerText = this.value;
},
methods: {
onInput(e) {
this.$emit('input', e.target.innerText);
}
}
});
var vm = new Vue({
el: '#app',
data: {
widget: {
Title: {
Name: ''
}
}
},
async created() {
this.widget.Title.Name = "toto"
},
methods: {
externalChange: function(e) {
this.widget.Title.Name = "changed title";
this.$root.$children[0].$refs["editable-text"].innerText = "changed title";
},
}
})<script src="https://cdn.jsdelivr.net/npm/vue@2.5.16/dist/vue.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<div id="app">
<editable-text v-model="widget.Title.Name"></editable-text>
<template>Name : {{widget.Title.Name}}</template>
<br>
<br>
<button v-on:click="externalChange">External update</button>
</div>
<template id="editable-text-template">
<p ref="editable-text" v-bind:contenteditable="contenteditable" v-on="listeners">
</p>
</template>