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ajax's Introduction

Ajax

nimble

Basic wrapper for ajax, for the javascript backend of nim

Examples

Generated Docs

Example: Alert the content of a file named test.html

import dom
import ajax

proc makeRequest(url:cstring) =
  var httpRequest = newXMLHttpRequest()

  if httpRequest.isNil:
    window.alert("Giving up :( Cannot create an XMLHTTP instance")
    return
  proc alertContents(e:Event) =
    if httpRequest.readyState == rsDONE:
      if httpRequest.status == 200:
        window.alert(httpRequest.responseText)
      else:
        window.alert("There was a problem with the request.")
  httpRequest.onreadystatechange = alertContents
  httpRequest.open("GET", url);
  httpRequest.send();

document.getElementById("ajaxButton").onclick = proc(e:Event) =
  makeRequest("test.html")

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ajax's Issues

Cannot set onerror handler

When I try to set an onerror handler on an httpRequest I get a type mismatch.

Here the details. The Nim code is:

import dom
import ajax

proc makeRequest(url:cstring) =
  var httpRequest = newXMLHttpRequest()

  proc alertContents(e:Event) =
    if httpRequest.readyState == rsDONE:
      if httpRequest.status == 200:
        window.alert(httpRequest.responseText)
      else:
        window.alert("There was a problem with the request.")
  proc alertError(e:Event) =
        window.alert("There was a FUNDAMENTAL problem with the request.")

  httpRequest.onreadystatechange = alertContents
  httpRequest.onerror = alertError
  httpRequest.open("GET", url);
  httpRequest.send();

document.getElementById("ajaxButton").onclick = proc(e:Event) =
  makeRequest("test.html")

The full error message of the compiler is:

Error: type mismatch: got <XMLHttpRequest, proc (e: Event){.noSideEffect, gcsafe, locks: 0.}>
but expected one of: 
macro `.=`(obj: JsObject; field, value: untyped): untyped
  first type mismatch at position: 1
  required type for obj: JsObject
  but expression 'httpRequest' is of type: XMLHttpRequest
macro `.=`[K: cstring; V](obj: JsAssoc[K, V]; field: untyped; value: V): untyped
  first type mismatch at position: 1
  required type for obj: JsAssoc[.=.K, .=.V]
  but expression 'httpRequest' is of type: XMLHttpRequest

Broken as of Nim 1.4

Using this library results in the error:

C:\Users\user\.nimble\pkgs\ajax-0.1.0\ajax.nim(16, 3) Error: attempt to redefine: 'onloadstart'

system library dom.nim's EventTargetObj now defines onloadstart, onprogress, onloadend

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