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我想創建一個元素，它將打開一個彈出窗口並向用戶顯示一條消息。我希望它可以通過我係統中的任何視圖訪問。所以我創建了一個全局變量來負責保存錯誤信息。我想知道當這個變量發生變化時，popup元素如何發現。我正在導入my-app.html中的彈出窗口。聚合物：觀察者全局變量
APP-data.html
<link rel="import" href="../../bower_components/polymer/polymer.html">
<dom-module id="app-data">
<script>
(function() {
var instances = [];
var vars = Object.create(Polymer.Base);
Polymer({
is: 'app-data',
properties: {
data: {
type: Object,
value: '',
notify: true,
readonly: false,
observer: '_data_changed'
},
key: String
},
created: function() {
key = this.getAttribute('key');
if (!key) {
console.log(this);
throw('app-data element requires key');
}
instances.push({key:key, instance:this});
},
detached: function() {
key = this.getAttribute('key');
var i = instances.indexOf({key:key, instance:this});
if (i >= 0) {
instances.splice(i, 1);
}
},
_data_changed: function(newvalue, oldvalue) {
key = this.getAttribute('key');
if (!key) {
throw('_data_changed: app-data element requires key');
}
vars.set(key, newvalue);
// notify the instances with the correct key
for (var i = 0; i < instances.length; i++) {
if (instances[i].key == key) {
instances[i].instance.notifyPath('data', newvalue);
}
}
}
});
}());
</script>
</dom-module>
菜單perfil.html
<link rel="import" href="../../bower_components/polymer/polymer.html">
<link rel="import" href="../../bower_components/app-route/app-location.html">
<link rel="import" href="../../bower_components/iron-ajax/iron-ajax.html">
<link rel="import" href="../../bower_components/iron-localstorage/iron-localstorage.html">
<link rel="import" href="../../bower_components/paper-input/paper-input.html">
<link rel="import" href="../../bower_components/paper-button/paper-button.html">
<link rel="import" href="app-data.html">
<dom-module id="menu-perfil">
<template>
<style>
.user-info {
padding: 20px;
}
.user-info .form-buttons {
margin-top: 10px;
}
</style>
<app-data id="idpopuphandler" key="popuphandler"></app-data>
<iron-localstorage name="user-storage" value="{{storedUser}}"></iron-localstorage>
<iron-ajax
id="registerLoginAjax"
method="post"
content-type="application/json"
handle-as="json"
on-response="handleUserResponse"
on-error="handleUserError"></iron-ajax>
<div class="user-info">
<div id="unauthenticated" hidden$="[[storedUser.loggedin]]">
<h2>Log in</h2>
<paper-input-container>
<label>Usuário</label>
<input is="iron-input" id="username" type="text" bind-value="{{formData.nome}}">
</paper-input-container>
<paper-input-container>
<label>Senha</label>
<input is="iron-input" id="password" type="password" bind-value="{{formData.senha}}">
</paper-input-container>
<div class="form-buttons">
<paper-button raised class="primary" on-tap="postLogin">Log In</paper-button>
</div>
</div>
</div>
</template>
<script>
(function() {
Polymer({
is: 'menu-perfil',
properties: {
formData: {
type: Object,
value: {}
},
storedUser: Object,
error: String
},
_setReqBody: function() {
this.$.registerLoginAjax.body = this.formData;
},
postLogin: function() {
this.$.registerLoginAjax.url = '/services/session/login';
this._setReqBody();
this.$.registerLoginAjax.generateRequest();
},
handleUserResponse: function(event) {
var response = event.detail.response;
console.log(response);
if (response.token) {
this.error = '';
this.storedUser = {
name: this.formData.nome,
token: response.token,
loggedin: true
};
} else if (response.erro) {
this.error = response.erro[0].message;
}
// reset form data
this.formData = {};
},
handleUserError: function(event) {
var errorArray = [];
var messageObject = {};
messageObject.message = 'Erro interno';
errorArray.push(messageObject);
this.$.idpopuphandler.data = errorArray;
}
});
})();
</script>
</dom-module>
彈出-message.html
<link rel="import" href="../../bower_components/polymer/polymer.html">
<link rel="import" href="../../bower_components/paper-dialog/paper-dialog.html" />
<link rel="import" href="../../bower_components/paper-button/paper-button.html">
<link rel="import" href="app-data.html">
<dom-module id="popup-message">
<template>
<app-data id="idpopuphandler" key="popuphandler"></app-data>
<paper-dialog id="idpopup">
<template is="dom-repeat" items="[[error]]">
<p>[[item.message]]</p>
</template>
<paper-button dialog-dismiss>Ok</paper-button>
</paper-dialog>
</template>
<script>
(function() {
Polymer({
is: 'popup-message',
properties: {
error: {
type: Array,
observer: '_errorMessageChange'
}
},
observers: [
'_errorMessageChange(this.$.idpopuphandler.data)'
],
_errorMessageChange: function(listMessage) {
console.log(listMessage);
if (listMessage.length > 0) {
this.error = listMessage;
this.$.idpopup.toggle();
}
}
});
})();
</script>
</dom-module>