我用Vue.js将数据发送到一个基本且非常简单的API,该API将邮箱地址订阅到下面的新闻稿via,并显示一些消息(状态和错误).
我特别使用指令v-if和v-for来显示错误和两条消息.问题是当页面加载时,这两个段落元素和无序列表元素"闪烁",直到页面完全加载或直到Vue.js实例被挂载.
我做错了吗?这是一个普遍的问题吗?我能做些什么来防止所有这些元素在加载时闪烁?
提前谢谢你.
以下是HTML:
<div id="subscribe-to-newsletter">
<form v-on:submit.prevent="storeSubscriber" novalidate>
<label for="email-address">E-mail address</label>
<input type="email" name="email_address" id="email-address" placeholder="exemple@nomdedomaine.fr" v-model="emailAddress">
<input type="submit" name="submit" value="Rester informé">
</form>
<p v-if="success">Thank you, we will keep you updated</p>
<p v-if="loading">Loading</p>
<ul v-for="error in errors.email_address">
<li v-text="error"></li>
</ul>
</div>
下面是JavaScript:
const subscribe = new Vue({
el: '#subscribe-to-newsletter',
data: {
emailAddress: '',
loading: false,
success: false,
errors: []
},
methods: {
storeSubscriber() {
subscribe.success = false;
subscribe.errors = [];
subscribe.loading = true;
var xhr = new XMLHttpRequest();
xhr.open('POST', '/api/subscriber', true);
xhr.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded; charset=utf-8');
xhr.setRequestHeader('X-Requested-With', 'XMLHttpRequest');
xhr.onreadystatechange = function () {
if (this.readyState == 4) {
subscribe.loading = false;
if (this.status == 200) {
subscribe.success = true;
} else {
subscribe.errors = JSON.parse(xhr.responseText);
}
}
}
xhr.send(encodeURI('email_address=' + subscribe.emailAddress));
},
}
})
Edit
我试图使用v-Clope指令,但它并没有解决问题
Solution
将此添加到CSS中
[v-cloak] {
display: none;
}
下面是新的HTML:
<div id="subscribe-to-newsletter">
<form v-on:submit.prevent="storeSubscriber" novalidate>
<label for="email-address">E-mail address</label>
<input type="email" name="email_address" id="email-address" placeholder="exemple@nomdedomaine.fr" v-model="emailAddress">
<input type="submit" name="submit" value="Rester informé">
</form>
<p v-if="success" v-cloak>Thank you, we will keep you updated</p>
<p v-if="loading" v-cloak>Loading</p>
<ul v-for="error in errors.email_address" v-cloak>
<li v-text="error"></li>
</ul>
</div>