web – 如何检索Firebase生成的对象ID?
发布时间:2020-12-14 22:32:58 所属栏目:资源 来源:网络整理
导读:我有以下对象: root: { id1: { /* this is an autogenerated id by Firebase */ name1: "abc",name2: "xyz" },id2: { name1: "abc",id3: { name1: "abc",} 我检索整个快照的代码是: getRoot () { firebase.database ().ref ('roots/') .on('value',functio
我有以下对象:
root: { id1: { /* this is an autogenerated id by Firebase */ name1: "abc",name2: "xyz" },id2: { name1: "abc",id3: { name1: "abc",} 我检索整个快照的代码是: getRoot () { firebase.database ().ref ('roots/') .on('value',function (snapshot) { console.log (snapshot.val()); }) } 一切都很完美.我从根组件中获取了所有对象,但我无法弄清楚如何访问ID及其子代?谢谢! 解决方法
我不记得我发布了这个问题.我很久以前就发现了这个怎么做.
这是完成工作的代码: 服务: myFunction () { var ref = firebase.database ().ref ('roots') return new Promise ((resolve,reject) => { ref.on ('value',function (snapshot) { if (snapshot.val () == null) { reject (null); } else { var list = new Array (); snapshot.forEach (function (data) { var item = { key: data.key,//this is to get the ID,if needed name1: data.val ().name1,name2: data.val ().name2,} list.push (item); }); resolve (list); } }); }); } 零件: this.myService.myFunction ().then (objects => { this.objects = objects; for (let obj of this.objects) { console.log (obj.key); } }).catch (error => { alert ('Nothing found'); }) 祝你编码愉快! (编辑:李大同) 【声明】本站内容均来自网络,其相关言论仅代表作者个人观点,不代表本站立场。若无意侵犯到您的权利,请及时与联系站长删除相关内容! |