将用户ID传递给core-ajax方法的GET请求，以从Google Cloud存储中检索数据。

huangapple
go评论132阅读模式
英文:

Pass user ID to core-ajax method GET to retrieve data in Google Cloud storage

问题

我有一个在Google引擎上使用Go后端的应用程序。我正在尝试检索之前保存在Google云存储中的JSON文件。后端基于Polymer和JavaScript。问题是需要使用用户ID通过core-ajax调用来检索数据。

以下是我目前正在使用的JavaScript代码：

  1. loadTrials: function loadTrials() {
  2.     var _this = this,
  3.         load = this.shadowRoot.querySelector('#load-trial');
  5.     load.url = "http://url/loadTrials";
  6.     load.go();
  7.     load.addEventListener('core-response', function(ev) {
  8.         var json = ev.detail.response;
  9.         _this.trialData = JSON.parse(json)['trial-data'];
  10.         console.log(JSON.parse(json)['trial-data'])
  11.     }, false);
  12. }

HTML部分：

  1. <core-ajax id="load-trial" method="GET"></core-ajax>

Go后端代码（只包含相关部分）：

  1. func handleloadTrials(w http.ResponseWriter, r *http.Request) {
  2.     defer r.Body.Close()
  4.     //retrieve trials
  5.     http.ServeFile(w, r, 与用户ID相关的JSON文件)
  6. }

我知道这段代码是错误的，但我完全被困住了，不知道如何将用户ID传递给GET方法，然后使用该ID从云存储中检索特定的文件（它是一个JSON文件），然后将此JSON文件传递给Go中的http.ServeFile方法。

需要帮助吗？非常感谢。

英文:

I have an app in google engine with a go backend. I'm trying to retrieve a json file that I previously saved in google cloud storage. The backend is based on polymer and javascript. The problem is that the data need to be retrieved using the user-id through a core-ajax call.

Here is the javascript code I'm using at the moment:

  1. loadTrials : function loadTrials() {
  2.             var _this = this,
  3.                 load = this.shadowRoot.querySelector(&#39;#load-trial&#39;);
  5.             load.url=&quot;http://url/loadTrials&quot;;
  6.             load.go();
  7.             load.addEventListener(&#39;core-response&#39;, function(ev) {
  8.                 var json = ev.detail.response;
  9.                 _this.trialData = JSON.parse(json)[&#39;trial-data&#39;];
  10.                 console.log(JSON.parse(json)[&#39;trial-data&#39;])
  11.             }, false);
  12.         }

The HTML

  1. &lt;core-ajax id=&quot;load-trial&quot;  method=&quot;GET&quot;&gt;&lt;/core-ajax&gt;

And the backend in go(just the relevant part):

  1. func handleloadTrials(w http.ResponseWriter, r *http.Request) {
  2. 	
  3. 	defer r.Body.Close()
  5. 	//retrieve trials
  6.     http.ServeFile(w, r, JSON file related to user id)
  8. }

I know this code is wrong, but I'm completely stuck and I don't know how to pass the user ID to the GET method, and then use the ID to retrieve the specific file on cloud storage (it's a json file) and then pass this Json file to the http.ServeFile method in Go.

Any help?
Thanks a lot.

答案1

得分: 1

<core-ajax url="{{url}}" handleAs="json" params='{"userID": "{{userID}}"}'></core-ajax>

参数应该是 JSON 格式的。

英文: 
  1. &lt;core-ajax url=&quot;{{url}}&quot; handleAs=&quot;json&quot; params=&#39;{&quot;userID&quot;: &quot;{{userID}}&quot;}&#39;&gt;&lt;/core-ajax&gt;

The parameter should be on JSON format.

答案2

得分: 0

我以这种方式部分解决了问题

Javascript:

  1. loadTrials : function loadTrials() {
  2.             var _this = this,
  3.                 load = this.shadowRoot.querySelector('#load-trial');
  4.             //将userID传递给core-ajax
  5.             _this.userID = _this.app.userSession.user;
  6.             load.url="http://url/loadTrials";
  7.             load.go();
  8.             load.addEventListener('core-response', function(ev) {
  9.                 var json = ev.detail.response;
  10.                 _this.trialData = JSON.parse(json)['trial-data'];
  11.                 console.log(JSON.parse(json)['trial-data'])
  12.             }, false);
  13.         }

HTML:

  1. <core-ajax id="load-trial" params="{{userID}}" method="GET"></core-ajax>

Go:

  1. type trialStruct []struct {
  2. 	Trial struct {
  3. 		Index           int    `json:"index"`
  4. 		Word            string `json:"word"`
  5. 		WordDisplayTime int    `json:"wordDisplayTime"`
  6. 		AnswerMaxTime   int    `json:"answerMaxTime"`
  7. 		FixationTime    int    `json:"fixationTime"`
  8. 		Train           bool   `json:"train"`
  9. 		Test            bool   `json:"test"`
  10. 		Grammatical     bool   `json:"grammatical"`
  11. 		Grammar         string `json:"grammar"`
  12. 		keyboard        bool   `json:"keyboard"`
  13. 	}
  14. 	Metadata struct {
  15. 	}
  16. }
  18. func (d *saveData) readFile(fileName string) trialStruct {
  19. 	trialName := fileName + "/trials"
  20. 	rc, err := storage.NewReader(d.ctx, bucket, trialName)
  21. 	if err != nil {
  22. 		d.errorf("readFile: unable to open file from bucket %q, file %q: %v", bucket, trialName, err)
  24. 	}
  25. 	defer rc.Close()
  26. 	slurp, err := ioutil.ReadAll(rc)
  27. 	if err != nil {
  28. 		d.errorf("readFile: unable to read data from bucket %q, file %q: %v", bucket, fileName, err)
  29. 	}
  30. 	var trialJson trialStruct
  31. 	err1 := json.Unmarshal(slurp, &trialJson)
  32. 	if err != nil {
  33. 		log.Printf("error:", err1)
  34. 	}
  35. 	return trialJson
  36. }

但现在我有一个编码的Json文件，我不确定如何将其发送回Javascript，需要帮助吗？谢谢

英文:

I partially solved in this way

Javascript:

  1. loadTrials : function loadTrials() {
  2.             var _this = this,
  3.                 load = this.shadowRoot.querySelector(&#39;#load-trial&#39;);
  4.             //pass userID to core-ajax
  5.             _this.userID = _this.app.userSession.user;
  6.             load.url=&quot;http://url/loadTrials&quot;;
  7.             load.go();
  8.             load.addEventListener(&#39;core-response&#39;, function(ev) {
  9.                 var json = ev.detail.response;
  10.                 _this.trialData = JSON.parse(json)[&#39;trial-data&#39;];
  11.                 console.log(JSON.parse(json)[&#39;trial-data&#39;])
  12.             }, false);
  13.         }

HTML:

  1. &lt;core-ajax id=&quot;load-trial&quot; params=&quot;{{userID}}&quot; method=&quot;GET&quot;&gt;&lt;/core-ajax&gt;

Go:

  1. type trialStruct []struct {
  2. 	Trial struct {
  3. 		Index           int    `json:&quot;index&quot;`
  4. 		Word            string `json:&quot;word&quot;`
  5. 		WordDisplayTime int    `json:&quot;wordDisplayTime&quot;`
  6. 		AnswerMaxTime   int    `json:&quot;answerMaxTime&quot;`
  7. 		FixationTime    int    `json:&quot;fixationTime&quot;`
  8. 		Train           bool   `json:&quot;train&quot;`
  9. 		Test            bool   `json:&quot;test&quot;`
  10. 		Grammatical     bool   `json:&quot;grammatical&quot;`
  11. 		Grammar         string `json:&quot;grammar&quot;`
  12. 		keyboard        bool   `json:&quot;keyboard&quot;`
  13. 	}
  14. 	Metadata struct {
  15. 	}
  16. }
  18. func (d *saveData) readFile(fileName string) trialStruct {
  19. 	trialName := fileName + &quot;/trials&quot;
  20. 	rc, err := storage.NewReader(d.ctx, bucket, trialName)
  21. 	if err != nil {
  22. 		d.errorf(&quot;readFile: unable to open file from bucket %q, file %q: %v&quot;, bucket, trialName, err)
  24. 	}
  25. 	defer rc.Close()
  26. 	slurp, err := ioutil.ReadAll(rc)
  27. 	if err != nil {
  28. 		d.errorf(&quot;readFile: unable to read data from bucket %q, file %q: %v&quot;, bucket, fileName, err)
  29. 	}
  30. 	var trialJson trialStruct
  31. 	err1 := json.Unmarshal(slurp, &amp;trialJson)
  32. 	if err != nil {
  33. 		log.Printf(&quot;error:&quot;, err1)
  34. 	}
  35. 	return trialJson
  36. }

But now I have the Encoded Json file which I'm not sure how to send back to the javascript, any help? Thanks

huangapple
  • 本文由 发表于 2015年5月19日 03:56:56
  • 转载请务必保留本文链接：https://go.coder-hub.com/30311770.html
  • go
  • google-app-engine
  • javascript
  • json
  • polymer
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