[英]How to create a function returning a promise that resolves after inner promise resolves
[英]How to render a template after promise resolves?
我希望在解析promise之后返回要在父級中呈現的模板。 我知道價值不能從承諾中返回。 收到模板數據后,如何呈現模板?
在以下示例中,ContentPane是列出要呈現的所有模板的父級。 在Films中,進行網絡調用,因此需要呈現模板。
ContentPane.prototype.getTemplate = function(){
let template = `
<div class="contentPane" id="contentPane">
${new Films().render()}
</div>
`;
return template;
}
Films.prototype.render = function(){
var template = this.getTemplate();
template.then(function(val){
return val;
})
//based on the value resolved by promise,
//appropriate template should be returned to parent
}
Films.prototype.getTemplate = async function(){
//make network call
//create template based on server response
}
嘗試aync-await操作....
const ContentPane = function() {}
const Films = function () {}
ContentPane.prototype.getTemplate = async function(){
let template = `
<div class="contentPane" id="contentPane">
${await new Films().render()}
</div>
`;
return template;
}
Films.prototype.render = async function(){
var value = await this.getTemplate();
return value;
}
Films.prototype.getTemplate = async function(){
return new Promise((res, rej) => {
setTimeout(() => {
res('123');
}, 1000);
});
}
new ContentPane().getTemplate().then(template => {
console.log(template);
});
我寫了一個例子。 ContentPane.prototype.getTemplate
可以返回一個promise,然后你可以從then
回調函數中獲取模板。 喜歡這個new ContentPane().getTemplate().then(template => { console.log(template); });
const ContentPane = function() {}
const Films = function () {}
ContentPane.prototype.getTemplate = async function(){
const filmsTemplate = await new Films().render();
let template = `
<div class="contentPane" id="contentPane">
${filmsTemplate}
</div>
`;
return template;
}
Films.prototype.render = function(){
var template = this.getTemplate();
return template.then(function(val){
return val;
})
//based on the value resolved by promise,
//appropriate template should be returned to parent
}
Films.prototype.getTemplate = async function(){
//make network call
//create template based on server response
return await new Promise((resolve) => {
resolve('123')
})
}
new ContentPane().getTemplate().then(template => {
console.log(template);
});
你可以像這樣解決你的問題。 它適合我:
<items ref="items" :all="all" @remove="removeItem" />
和==>
this.$api.productCategories.delete(item.id , true)
.then(res => {
this.all = this.all.filter(i => i.id !== item.id) this.$showSuccess(this.$t('productCategories.productCategoryRemoved'))
this.$nextTick(() => {
this.$refs.items.reinit()
})
})
.catch(err => {
this.$showError(this.$getLocaleErrorMessage(err, 'productCategories'))
})
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