Polymer iron-ajax response code
Question
I am using Polymer 1.6 and <iron-ajax> for my API calls. I cannot distinguish between these two situations based on iron-ajax-error event:
- Basic authentication failure on back-end (browser returns
403 Forbidden) - Service not found (browser returns
404 Not Found)
In both situations, the response body is empty even though in the authentication problem, the server responds with a JSON body.
I would like to read the response status code, or be able to get the response body in situation 1.
2 answers
solution1
7 ACCPTED 2016-12-06 09:32:43
When the server responds with an error, the response body is supposed to be null according to the spec . However, <iron-ajax> 's event detail still provides access to the status code and status text.
<iron-ajax>.response event
The event detail of the <iron-ajax>.response event is an <iron-request> . The status code is stored in <iron-request>.status and the corresponding text is in <iron-request>.statusText :
_onResponse: function(e) {
const req = e.detail; // iron-request
console.log('status', req.status, req.statusText);
}
HTMLImports.whenReady(() => { Polymer({ is: 'x-foo', _onResponse: function(e) { const req = e.detail; console.log('response', req.status, req.statusText); this.responseStatus = req.status; this.responseStatusText = req.statusText; }, _onError: function(e) { const req = e.detail.request; const err = e.detail.error; console.log('error', err, req.status, req.statusText); this.errorStatus = req.status; this.errorStatusText = req.statusText; this.errorMessage = err; } }); });
<head> <base href="https://polygit.org/polymer+1.11.1/components/"> <script src="webcomponentsjs/webcomponents-lite.js"></script> <link rel="import" href="polymer/polymer.html"> <link rel="import" href="iron-ajax/iron-ajax.html"> </head> <body> <x-foo></x-foo> <dom-module id="x-foo"> <template> <iron-ajax url="//httpbin.org/status/200" auto on-response="_onResponse" on-error="_onError"></iron-ajax> <div>'on-response' status: [[responseStatus]] ([[responseStatusText]])</div> </template> </dom-module> </body>
<iron-ajax>.error event
Note the <iron-ajax>.error event's detail is different from that of the <iron-ajax>.response . The error 's event detail is an object with the following shape:
{
error: String,
request: iron-request
}
So the <iron-ajax>.error event handler could read the status and status text as follows:
_onError: function(e) {
const req = e.detail.request; // iron-request
console.log('status', req.status, req.statusText);
}
HTMLImports.whenReady(() => { Polymer({ is: 'x-foo', _onResponse: function(e) { const req = e.detail; console.log('response', req.status, req.statusText); this.responseStatus = req.status; this.responseStatusText = req.statusText; }, _onError: function(e) { const req = e.detail.request; const err = e.detail.error; console.log('error', err, req.status, req.statusText); this.errorStatus = req.status; this.errorStatusText = req.statusText; this.errorMessage = err; } }); });
<head> <base href="https://polygit.org/polymer+1.11.1/components/"> <script src="webcomponentsjs/webcomponents-lite.js"></script> <link rel="import" href="polymer/polymer.html"> <link rel="import" href="iron-ajax/iron-ajax.html"> </head> <body> <x-foo></x-foo> <dom-module id="x-foo"> <template> <iron-ajax url="//httpbin.org/status/404" auto on-response="_onResponse" on-error="_onError"></iron-ajax> <div>'on-error' status: [[errorStatus]] ([[errorStatusText]]) - [[errorMessage]]</div> </template> </dom-module> </body>
solution2
0 2016-12-06 08:51:36
When I want to see the response for error cases, I register an handler function to error event and look up e.detail.response or e.detail.request.xhr.response , like followings:
<dom-module id="my-login">
<template>
<iron-ajax url="http://some-url.com"
method="POST"
content-type="application/x-www-form-urlencoded"
body="{{reqBody}}"
handle-as="json"
on-response="onResponse"
on-error="onError" id="xhr"></iron-ajax>
</template>
<script>
Polymer({
is: 'my-component',
properties: {
reqBody: {
type: Object,
value: {}
}
},
onResponse: function(e) {
console.log(e.detail.response);
},
onError: function(e) {
// I think one of those two would be what you're looking for.
console.log(e.detail.response);
console.log(e.detail.request.xhr.response);
}
});
</script>
</dom-module>
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