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如果数据库变量已更改Meteor,则重新加载页面内容

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0

Vishnu Chauhan · 技术社区 · 6 年前

我正在开发流星应用程序。我想在数据库变量发生更改时重新加载客户端的内容。我正在使用pub-sub。如果状态变量已更改,我希望加载内容。

Meteor.publish('activities', function(loggedInUserToken) {
    var authObj = AuthenticationToken.findOne({ authToken: loggedInUserToken });
    if (authObj) {
        var userObj = Users.findOne({ _id: authObj.user_id });
        var activities = Activities.find({}, { sort: { createdAt: -1 } });
        return activities;
    }
    return this.ready();
});


Template.masterSku.onCreated(function() {
    var instance = this;
    instance.autorun(function() {
        var loggedInUserToken = "xxxxxxxxxxxxxxxx"
        statusSuscription = instance.subscribe("activities", loggedInUserToken);
        var activitiesObj = Activities.findOne({}, { sort: { createdAt: -1 } })
        if (activitiesObj && activitiesObj.status == "true") {
            console.log("Status Changed load Content accordingly")
        }
})

2 回复 | 直到 6 年前

1

0

Jankapunkt 6 年前

这个 autorun 在反应性数据发生更改并且在计算中请求此更改之前,不会重新计算。虽然订阅是被动源,但您还需要检查它的就绪性,从而导致新的计算周期:

instance.autorun(function() {
    var loggedInUserToken = "xxxxxxxxxxxxxxxx"
    var statusSuscription = instance.subscribe("activities", loggedInUserToken);
    if (statusSuscription.ready()) { // causes a new compuation by the Tracker
      var activitiesObj = Activities.findOne({}, { sort: { createdAt: -1 } })
      if (activitiesObj && activitiesObj.status == "true") {
        console.log("Status Changed load Content accordingly")
        // here you can insert data into a ReactiveVar or ReactiveDict and use
        // result in a Template helper, which itself will cause your Template to re-render
      }
    }
}

2

0

Vishal 6 年前

您可以在oncreated函数中使用tracker,也可以尝试通过助手填充数据。

import { Tracker } from 'meteor/tracker';

Tracker.autorun(() => {
 var loggedInUserToken = "xxxxxxxxxxxxxxxx"
        statusSuscription = instance.subscribe("activities", loggedInUserToken);
        var activitiesObj = Activities.findOne({}, { sort: { createdAt: -1 } })
        if (activitiesObj && activitiesObj.status == "true") {
            console.log("Status Changed load Content accordingly")
        }
});