Javascript 在 html img 标签中显示来自 firebase 存储的图像

Display images from firebase storage in html img tags

提问by crispy2k12

I'm attempting to display an image from firebase into html imgtags, but it fails to retrieve the image.

我正在尝试将 firebase 中的图像显示为 htmlimg标签，但无法检索图像。

Javascript code:

Javascript代码：

var storageRef = firebase.storage().ref();
var spaceRef = storageRef.child('images/photo_1.png');
var path = spaceRef.fullPath;
var gsReference = storage.refFromURL('gs://test.appspot.com')

storageRef.child('images/photo_1.png').getDownloadURL().then(function(url) {
  var test = url;
}).catch(function(error) {

});

html code:

html代码：

<img src="test" height="125" width="50"/>

采纳答案by Mosh Feu

Once you have the testvariable, you need to set the image's src to it using a script.

获得test变量后，您需要使用脚本将图像的 src 设置为它。

Something like this:

像这样的东西：

//var storage    = firebase.storage();
//var storageRef = storage.ref();
//var spaceRef = storageRef.child('images/photo_1.png');
//
//storageRef.child('images/photo_1.png').getDownloadURL().then(function(url) {
//
//
//  var test = url;
//  add this line here:
//  document.querySelector('img').src = test;
//
//}).catch(function(error) {
//
//});
//
var test = 'firebase_url';

document.querySelector('img').src = test;

<img height="125" width="50"/>

回答by VyTcdc

The bellow two lines which is commented are not required, I have tested. it is working fine.

下面两行注释是不需要的，我已经测试过了。它工作正常。

//var path = spaceRef.fullPath;
//var gsReference = storage.refFromURL('gs://test.appspot.com')

    <script>
     function showimage() {



         var storageRef = firebase.storage().ref();
         var spaceRef = storageRef.child('sweet_gift/vytcdc.png');
         storageRef.child('sweet_gift/vytcdc.png').getDownloadURL().then(function(url) {
             var test = url;
             alert(url);
             document.querySelector('img').src = test;

         }).catch(function(error) {

         });


     }
    </script>
    <input type="button" value ="view Image" id="viewbtn" onclick="showimage();">
    <img src="test" height="125px" width="200px"/> 

回答by Thando Zondo

try this :-)

尝试这个 ：-）

//var storage    = firebase.storage();
//var storageRef = storage.ref();
//var spaceRef = storageRef.child('images/photo_1.png');
//
//storageRef.child('images/photo_1.png').getDownloadURL().then(function(url) {
//
//
//  var test = url;
//  add this line here:
//  document.getElementById("your_img_id").src = test;
//
//}).catch(function(error) {
//
//});
//

<img height="125" width="50" id="your_img_id" src=""/>

回答by Rajender rathore

           var uploader=document.getElementById('uploader'),
           fileButton=document.getElementById('fileButton');

           fileButton.addEventListener('change', function(e) {

           var file=e.target.files[0];

           var storageRef=firebase.storage().ref("'/images/'"+file.name);


            var task=storageRef.put(file);

            task.on('state_changed',

            function progress(snapshot){
            var percentage=( snapshot.bytesTransferred / snapshot.totalBytes )*100;
            uploader.value=percentage;
            if (percentage==100){
            alert("file uploaded Successfully");
            }
            },
            function error(err){

            },
            function complete(){

                 var text1=document.getElementById('text3');
                 var text7=document.getElementById('text4');
                 var text8=document.getElementById('text5');
                 var text9=document.getElementById('text6');

                var downloadURL =task.snapshot.downloadURL; 
                var postkey=firebase.database().ref('data-modeling/').push();
                var text2=text1.value;
                postkey.child("Name").set(text2);
                var texta=text7.value;
                postkey.child("Address").set(texta);
                var textb=text8.value;
                postkey.child("Age").set(textb);
                var textc=text9.value;
                postkey.child("PhoneNo").set(textc);
                postkey.child("url").set(downloadURL)
                alert('successful Submit');




             });

            }


        );

回答by sangram desai

This is a well-tested code. it is working fine. just follow these steps.

这是一个经过良好测试的代码。它工作正常。只需按照以下步骤操作即可。

html code:

html代码：

<img id="myImgId" src="" height="125" width="50"/>

Add config Information here

在此处添加配置信息

  con = {
        "apiKey": "your key",
        "authDomain": "example.firebaseapp.com",
        "databaseURL": "https://example.firebaseio.com/",
        "projectId": "example",
        "storageBucket": "example.appspot.com",
        "messagingSenderId": "id"
    };

Initialize firebase using this

使用这个初始化firebase

firebase.initializeApp(con);

Create a reference with an initial file path and name

创建具有初始文件路径和名称的引用

var storage = firebase.storage();
var storageRef = storage.ref();
//urll is the url for image
storageRef.child(urll).getDownloadURL().then(function(url) {
  // Or inserted into an <img> element:
  var img = document.getElementById('myImgId');
  img.src = url;
}).catch(function(error) {
  // Handle any errors
});