节点js restler结果“获取"尝试返回结果时未完成 [英] node js restler result "get" not complete when trying to return result

问题描述

我正在尝试使用Restler获取网站的HTML.但是，当我尝试获取结果的相关部分时，总是会出现错误，

I'm trying to get the HTML of a website using restler. But when I try to get the relevant part of result, I always get the error,

"TypeError:无法读取未定义的属性'rawEncoded'".

"TypeError: Cannot read property 'rawEncoded' of undefined".

"rawEncoded"有时是"res".我认为它会根据处理时间而变化.

'rawEncoded' sometimes is 'res'. I think it changes based on processing time.

我正在尝试从restler获取result.request.res.rawEncode来获取结果.

I'm trying to get result.request.res.rawEncode from restler get result.

我的功能:

var rest = require('restler');

var loadHtmlUrl = function(weburl) {
    var resultstr = rest.get(weburl).on('complete', function(result) {
        var string = result.request.res.rawEncode;
        return string;
    });
    return resultstr;
};

然后:

var htmlstring = loadHtmlUrl('http://google.com');

也许restler是完全错误的方法.也许我不太了解.但是我肯定被困住了...

Maybe restler is the entirely wrong way to go. Maybe I don't understand it completely. But I'm definitely stuck...

谢谢！

推荐答案

在调用on('complete'回调之前，您的return resultstr;是否不会运行，因为它是异步的，因此导致您的htmlstring为空吗?我认为您需要像这样将loadHtmlUrl的参数作为回调:

Would your return resultstr; not run before the on('complete' callback gets called because it is asynchronous, therefore resulting in your htmlstring being null? I think you need to have a callback as a parameter to your loadHtmlUrl like so:

var rest = require('restler');

var loadHtmlUrl = function(weburl, callback) {
    var resultstr = rest.get(weburl).on('complete', function(result) {
      callback(result.request.res.rawEncode);
    });
};

然后这样称呼它:

var htmlstring = null;
loadHtmlUrl('http://google.com', function(rawEncode) {
  htmlstring = rawEncode;
  //Do your stuff here...
});

我认为这将解决您将来遇到的问题.但是，我认为您面临的真正问题是result.request没有res属性.我在想我的上述更改可能会解决此问题(不太确定如何解决).如果没有，那么我建议您查看result.request具有哪些属性作为调试入门...

I think that will resolve future problems you will have. However, I think the real problem you're facing is that result.request does not have the property of res. I'm thinking that my change above may fix this problem (not quite sure how). If not, then I would recommend looking at what properties result.request has as a debugging starter...

这篇关于节点js restler结果“获取"尝试返回结果时未完成的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！