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JavaScript在行走JSON树时更改路径[重复](JavaScript change the path when walking a JSON tree [duplicate])
JavaScript在行走JSON树时更改路径[重复](JavaScript change the path when walking a JSON tree [duplicate])
这个问题在这里已有答案：
- 使用字符串键 28答案 访问嵌套的JavaScript对象
目前，正如您可以从这个小提琴中看到的那样，我将JSON存储为变量：
const tree = { ... }然后，JS遍历整个树，搜索“201603”下的所有结果：
const Chart201603 = walk(tree, '201603');最后，脚本然后仅搜索要显示的“浓度”节点：
const Chart201603_Concentration = Chart201603.map(entry => { return entry.Concentration; });然后在'201603'和'Concentration'下的整个树中找到的数字数组打印到我的HTML中的span以及数组的总和：
我还可以通过更改此行来指定JS中我希望JS在哪里查找此信息：
const Chart201603 = walk(tree, '201603');对于这样的事情：
const Chart201603 = walk(tree.BILL.Municipal, '201603');现在，由于它跳过了一些节点，因此返回的结果更少：
然而，我想做的，而不是像这样硬编码到JS的所需路径，是因为它等于文本区域或跨度等的值。
像这样的东西。
现在有一个设置值的跨度，如下所示：
<span id="value">BILL.Municipal</span>我创建了一个跨度值的变量：
const newPath = document.getElementById('value').innerHTML;但是现在当我设置这样的路径时：
const Chart201603 = walk(tree.newPath, '201603');它不会返回任何结果。
任何人都可以帮助解决这个问题吗？ 并建议我如何使这种方法工作？
这里是代码，你不想用JSFiddle测试：
const walk = (root, filter) => { const result = []; const follow = (root) => { if (root instanceof Array) { root.forEach(elem => { follow(elem); }); } else if (root instanceof Object) { Object.keys(root).forEach(elem => { if (elem === filter) { result.push(root[elem]); } else { follow(root[elem]); } }); } }; follow(root); return result; }; const tree = { "BILL" : { "Municipal" : { "CAD" : { "Short" : { "Low" : { "High" : { "N" : { "CANADA" : { "IssueName00085" : { "CA6832Z57Z70" : { "201603" : { "Concentration" : 2, "ConcentrationTier1" : 2, "ConcentrationTier2" : 0, "LargestTicket" : 0, "Maturity" : 201708, "Outstanding" : 140, "SmallestTicket" : 0, "Turnover" : 0, "TurnoverTeir2" : 0, "TurnoverTier1" : 0 }, "201604" : { "Concentration" : 6, "ConcentrationTier1" : 3, "ConcentrationTier2" : 3, "LargestTicket" : 0, "Maturity" : 201708, "Outstanding" : 140, "SmallestTicket" : 0, "Turnover" : 0, "TurnoverTeir2" : 0, "TurnoverTier1" : 0 } } } }, "USA" : { "IssueName00953" : { "USA688I57Z70" : { "201603" : { "Concentration" : 4, "ConcentrationTier1" : 2, "ConcentrationTier2" : 2, "LargestTicket" : 0, "Maturity" : 201708, "Outstanding" : 40, "SmallestTicket" : 0, "Turnover" : 0, "TurnoverTeir2" : 0, "TurnoverTier1" : 0 }, "201604" : { "Concentration" : 9, "ConcentrationTier1" : 7, "ConcentrationTier2" : 2, "LargestTicket" : 0, "Maturity" : 201708, "Outstanding" : 140, "SmallestTicket" : 0, "Turnover" : 0, "TurnoverTeir2" : 0, "TurnoverTier1" : 0 } } } } } } } } } }, "Sovereign" : { "USD" : { "Short" : { "High" : { "High" : { "N" : { "MEXICO" : { "IssueName00385" : { "ME6832Z57Z70" : { "201603" : { "Concentration" : 9, "ConcentrationTier1" : 2, "ConcentrationTier2" : 7, "LargestTicket" : 0, "Maturity" : 201708, "Outstanding" : 140, "SmallestTicket" : 0, "Turnover" : 0, "TurnoverTeir2" : 0, "TurnoverTier1" : 0 }, "201604" : { "Concentration" : 16, "ConcentrationTier1" : 3, "ConcentrationTier2" : 13, "LargestTicket" : 0, "Maturity" : 201708, "Outstanding" : 140, "SmallestTicket" : 0, "Turnover" : 0, "TurnoverTeir2" : 0, "TurnoverTier1" : 0 } } } }, "USA" : { "IssueName00953" : { "USA688I57Z70" : { "201603" : { "Concentration" : 4, "ConcentrationTier1" : 2, "ConcentrationTier2" : 2, "LargestTicket" : 0, "Maturity" : 201708, "Outstanding" : 40, "SmallestTicket" : 0, "Turnover" : 0, "TurnoverTeir2" : 0, "TurnoverTier1" : 0 }, "201604" : { "Concentration" : 9, "ConcentrationTier1" : 7, "ConcentrationTier2" : 2, "LargestTicket" : 0, "Maturity" : 201708, "Outstanding" : 140, "SmallestTicket" : 0, "Turnover" : 0, "TurnoverTeir2" : 0, "TurnoverTier1" : 0 } } } } } } } } } } } } const newPath = document.getElementById('value').innerHTML; console.log(newPath) const Chart201603 = walk(tree.newPath, '201603'); const Chart201603_Concentration = Chart201603.map(entry => { return entry.Concentration; }); document.getElementById("Array201603Concentration").innerHTML = Chart201603_Concentration.join(' '); var ConcentrationSum = Chart201603_Concentration.reduce((total, num) => { return total + num; }, 0); document.getElementById("Array201603ConcentrationSum").innerHTML = ConcentrationSum;<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script> <span id="value">BILL.Municipal</span> <p>Array: <span id="Array201603Concentration"></span></p> <p>Array Sum: <span id="Array201603ConcentrationSum"></span></p>This question already has an answer here:
Currently, as you can see from this fiddle, I have a JSON stored as the variable:
const tree = { ... }The JS then walks the entire tree searching for all results under '201603':
const Chart201603 = walk(tree, '201603');Finally, the script then searches for only 'Concentration' nodes to be displayed:
const Chart201603_Concentration = Chart201603.map(entry => { return entry.Concentration; });The array of numbers found in the entire tree under '201603' and 'Concentration' is then printed to a span in my HTML as well as the sum of the array:
I can also specify where in the tree I want the JS to look for this information by changing this line:
const Chart201603 = walk(tree, '201603');To something like this:
const Chart201603 = walk(tree.BILL.Municipal, '201603');This now returns fewer results as it has skipped out some nodes:
What I want to do, however, rather than hard code the desired path into the JS like this, is for it to equal the value of a text area or span etc.
Something like this.
Now there is a span with the value set like so:
<span id="value">BILL.Municipal</span>And i've created a variable of the spans value:
const newPath = document.getElementById('value').innerHTML;But now when I set the path like so:
const Chart201603 = walk(tree.newPath, '201603');It does not return any results.
Can anybody help with this issue? And advise how I can get this method working?
Here is the code too incase you would rather not test with JSFiddle:
const walk = (root, filter) => { const result = []; const follow = (root) => { if (root instanceof Array) { root.forEach(elem => { follow(elem); }); } else if (root instanceof Object) { Object.keys(root).forEach(elem => { if (elem === filter) { result.push(root[elem]); } else { follow(root[elem]); } }); } }; follow(root); return result; }; const tree = { "BILL" : { "Municipal" : { "CAD" : { "Short" : { "Low" : { "High" : { "N" : { "CANADA" : { "IssueName00085" : { "CA6832Z57Z70" : { "201603" : { "Concentration" : 2, "ConcentrationTier1" : 2, "ConcentrationTier2" : 0, "LargestTicket" : 0, "Maturity" : 201708, "Outstanding" : 140, "SmallestTicket" : 0, "Turnover" : 0, "TurnoverTeir2" : 0, "TurnoverTier1" : 0 }, "201604" : { "Concentration" : 6, "ConcentrationTier1" : 3, "ConcentrationTier2" : 3, "LargestTicket" : 0, "Maturity" : 201708, "Outstanding" : 140, "SmallestTicket" : 0, "Turnover" : 0, "TurnoverTeir2" : 0, "TurnoverTier1" : 0 } } } }, "USA" : { "IssueName00953" : { "USA688I57Z70" : { "201603" : { "Concentration" : 4, "ConcentrationTier1" : 2, "ConcentrationTier2" : 2, "LargestTicket" : 0, "Maturity" : 201708, "Outstanding" : 40, "SmallestTicket" : 0, "Turnover" : 0, "TurnoverTeir2" : 0, "TurnoverTier1" : 0 }, "201604" : { "Concentration" : 9, "ConcentrationTier1" : 7, "ConcentrationTier2" : 2, "LargestTicket" : 0, "Maturity" : 201708, "Outstanding" : 140, "SmallestTicket" : 0, "Turnover" : 0, "TurnoverTeir2" : 0, "TurnoverTier1" : 0 } } } } } } } } } }, "Sovereign" : { "USD" : { "Short" : { "High" : { "High" : { "N" : { "MEXICO" : { "IssueName00385" : { "ME6832Z57Z70" : { "201603" : { "Concentration" : 9, "ConcentrationTier1" : 2, "ConcentrationTier2" : 7, "LargestTicket" : 0, "Maturity" : 201708, "Outstanding" : 140, "SmallestTicket" : 0, "Turnover" : 0, "TurnoverTeir2" : 0, "TurnoverTier1" : 0 }, "201604" : { "Concentration" : 16, "ConcentrationTier1" : 3, "ConcentrationTier2" : 13, "LargestTicket" : 0, "Maturity" : 201708, "Outstanding" : 140, "SmallestTicket" : 0, "Turnover" : 0, "TurnoverTeir2" : 0, "TurnoverTier1" : 0 } } } }, "USA" : { "IssueName00953" : { "USA688I57Z70" : { "201603" : { "Concentration" : 4, "ConcentrationTier1" : 2, "ConcentrationTier2" : 2, "LargestTicket" : 0, "Maturity" : 201708, "Outstanding" : 40, "SmallestTicket" : 0, "Turnover" : 0, "TurnoverTeir2" : 0, "TurnoverTier1" : 0 }, "201604" : { "Concentration" : 9, "ConcentrationTier1" : 7, "ConcentrationTier2" : 2, "LargestTicket" : 0, "Maturity" : 201708, "Outstanding" : 140, "SmallestTicket" : 0, "Turnover" : 0, "TurnoverTeir2" : 0, "TurnoverTier1" : 0 } } } } } } } } } } } } const newPath = document.getElementById('value').innerHTML; console.log(newPath) const Chart201603 = walk(tree.newPath, '201603'); const Chart201603_Concentration = Chart201603.map(entry => { return entry.Concentration; }); document.getElementById("Array201603Concentration").innerHTML = Chart201603_Concentration.join(' '); var ConcentrationSum = Chart201603_Concentration.reduce((total, num) => { return total + num; }, 0); document.getElementById("Array201603ConcentrationSum").innerHTML = ConcentrationSum;<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script> <span id="value">BILL.Municipal</span> <p>Array: <span id="Array201603Concentration"></span></p> <p>Array Sum: <span id="Array201603ConcentrationSum"></span></p>
原文：https://stackoverflow.com/questions/45863430
更新时间：2023-09-20 18:09
最满意答案
您需要使用所有视图状态POST到相同的URL，然后将__EVENTARGUMENT帖子值更改为Page $ 1，Page $ 2，Page $ 3等
像这样的东西
//Create request to URL. HttpWebRequest request = (HttpWebRequest)WebRequest.Create("http://www.roads.maryland.gov/pages/cic.aspx?PageId=857&Type=tab"); //Set request headers. request.KeepAlive = true; request.Headers.Add("Origin", @"http://www.roads.maryland.gov"); request.Headers.Add("X-MicrosoftAjax", "Delta=true"); request.UserAgent = "Mozilla/1.0"; request.ContentType = "application/x-www-form-urlencoded; charset=UTF-8"; request.Accept = "*/*"; request.Headers.Set(HttpRequestHeader.AcceptLanguage, "en-GB,en;q=0.8,en-US;q=0.6"); //Set request method request.Method = "POST"; // Disable 'Expect: 100-continue' behavior. More info: http://haacked.com/archive/2004/05/15/http-web-request-expect-100-continue.aspx request.ServicePoint.Expect100Continue = false; //Set request body. string body = "__EVENTARGUMENT=Page%24"; body += pageNumber.ToString(); body += @"&ctl00%24PlaceHolderMain%24ScriptManager1=ctl00%24PlaceHolderMain%24CICContract1%24displayPanel1%7Cctl00%24PlaceHolderMain%24CICContract1%24gvSSP&MSO_PageHashCode=687&MSOWebPartPage_PostbackSource=&MSOTlPn_SelectedWpId=&MSOTlPn_View=0&MSOTlPn_ShowSettings=False&MSOGallery_SelectedLibrary=&MSOGallery_FilterString=&MSOTlPn_Button=none&__REQUESTDIGEST=0x8DBC9CD602B61A910B12C83C03A47B6755DE07797515E34AEA8EE0BDC93813FC6A208251090430008C51E50BF4A3D0EBEAF4A9F2CC60072EC4B6B5FED3F48D31%2C20%20Nov%202014%2017%3A15%3A59%20-0000&MSOSPWebPartManager_DisplayModeName=Browse&MSOWebPartPage_Shared=&MSOLayout_LayoutChanges=&MSOLayout_InDesignMode=&MSOSPWebPartManager_OldDisplayModeName=Browse&MSOSPWebPartManager_StartWebPartEditingName=false&ctl00%24PlaceHolderSearchArea%24q=Search&ctl00%24PlaceHolderMain%24CICContract1%24ddlPulldown=tab&__EVENTTARGET=ctl00%24PlaceHolderMain%24CICContract1%24gvSSP&__LASTFOCUS=&__VIEWSTATE=%2F ...massive viewstate... %3D&__VIEWSTATEGENERATOR=E6DD55AA&__EVENTVALIDATION=%2FwEWKwK7ur20CQKpuunwCgLbzK2CBQKBio7OBALDpsvcBQK6mIPlBQLa0ZnPCgLmidHRCQKu%2FbCaDQKvg%2BHxDwKl%2FYSaDQK87ov7BQKV8JfxAQKdo6DlBgLSppvcBQLFutGoAwK3suC5CgK3spS5CgK3sui5CgK3svC5CgK3suS5CgK3svi5CgK3ssy5CgK3ssC5CgLZuKSJCwKykYb0DgKrq%2FH8DAK3zM7sDALA%2BfaWBAKYyYezCwK3suC5CgK3spS5CgK3sui5CgK3svC5CgK3suS5CgK3svi5CgK3ssy5CgK3ssC5CgLZuKSJCwKykYb0DgKrq%2FH8DALl54b0BgK%2FjseDBA0f8JbX2FIE%2F7%2FP1ojwVriOGXif&__ASYNCPOST=true&"; byte[] postBytes = System.Text.Encoding.UTF8.GetBytes(body); request.ContentLength = postBytes.Length; Stream stream = request.GetRequestStream(); stream.Write(postBytes, 0, postBytes.Length); stream.Close(); //Get response to request. response = (HttpWebResponse)request.GetResponse();You'll need to POST to the same URL with all the viewstate you can then vary the __EVENTARGUMENT post value to Page$1, Page$2, Page$3, etc
Something like this
//Create request to URL. HttpWebRequest request = (HttpWebRequest)WebRequest.Create("http://www.roads.maryland.gov/pages/cic.aspx?PageId=857&Type=tab"); //Set request headers. request.KeepAlive = true; request.Headers.Add("Origin", @"http://www.roads.maryland.gov"); request.Headers.Add("X-MicrosoftAjax", "Delta=true"); request.UserAgent = "Mozilla/1.0"; request.ContentType = "application/x-www-form-urlencoded; charset=UTF-8"; request.Accept = "*/*"; request.Headers.Set(HttpRequestHeader.AcceptLanguage, "en-GB,en;q=0.8,en-US;q=0.6"); //Set request method request.Method = "POST"; // Disable 'Expect: 100-continue' behavior. More info: http://haacked.com/archive/2004/05/15/http-web-request-expect-100-continue.aspx request.ServicePoint.Expect100Continue = false; //Set request body. string body = "__EVENTARGUMENT=Page%24"; body += pageNumber.ToString(); body += @"&ctl00%24PlaceHolderMain%24ScriptManager1=ctl00%24PlaceHolderMain%24CICContract1%24displayPanel1%7Cctl00%24PlaceHolderMain%24CICContract1%24gvSSP&MSO_PageHashCode=687&MSOWebPartPage_PostbackSource=&MSOTlPn_SelectedWpId=&MSOTlPn_View=0&MSOTlPn_ShowSettings=False&MSOGallery_SelectedLibrary=&MSOGallery_FilterString=&MSOTlPn_Button=none&__REQUESTDIGEST=0x8DBC9CD602B61A910B12C83C03A47B6755DE07797515E34AEA8EE0BDC93813FC6A208251090430008C51E50BF4A3D0EBEAF4A9F2CC60072EC4B6B5FED3F48D31%2C20%20Nov%202014%2017%3A15%3A59%20-0000&MSOSPWebPartManager_DisplayModeName=Browse&MSOWebPartPage_Shared=&MSOLayout_LayoutChanges=&MSOLayout_InDesignMode=&MSOSPWebPartManager_OldDisplayModeName=Browse&MSOSPWebPartManager_StartWebPartEditingName=false&ctl00%24PlaceHolderSearchArea%24q=Search&ctl00%24PlaceHolderMain%24CICContract1%24ddlPulldown=tab&__EVENTTARGET=ctl00%24PlaceHolderMain%24CICContract1%24gvSSP&__LASTFOCUS=&__VIEWSTATE=%2F ...massive viewstate... %3D&__VIEWSTATEGENERATOR=E6DD55AA&__EVENTVALIDATION=%2FwEWKwK7ur20CQKpuunwCgLbzK2CBQKBio7OBALDpsvcBQK6mIPlBQLa0ZnPCgLmidHRCQKu%2FbCaDQKvg%2BHxDwKl%2FYSaDQK87ov7BQKV8JfxAQKdo6DlBgLSppvcBQLFutGoAwK3suC5CgK3spS5CgK3sui5CgK3svC5CgK3suS5CgK3svi5CgK3ssy5CgK3ssC5CgLZuKSJCwKykYb0DgKrq%2FH8DAK3zM7sDALA%2BfaWBAKYyYezCwK3suC5CgK3spS5CgK3sui5CgK3svC5CgK3suS5CgK3svi5CgK3ssy5CgK3ssC5CgLZuKSJCwKykYb0DgKrq%2FH8DALl54b0BgK%2FjseDBA0f8JbX2FIE%2F7%2FP1ojwVriOGXif&__ASYNCPOST=true&"; byte[] postBytes = System.Text.Encoding.UTF8.GetBytes(body); request.ContentLength = postBytes.Length; Stream stream = request.GetRequestStream(); stream.Write(postBytes, 0, postBytes.Length); stream.Close(); //Get response to request. response = (HttpWebResponse)request.GetResponse();
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- 错误：RPC失败;(error: RPC failed; curl transfer closed with outstanding read data remaining)
- C＃类名中允许哪些字符？(What characters are allowed in C# class name?)
- NumPy：将int64值存储在np.array中并使用dtype float64并将其转换回整数是否安全？(NumPy: Is it safe to store an int64 value in an np.array with dtype float64 and later convert it back to integer?)
- 注销后如何隐藏导航portlet？(How to hide navigation portlet after logout?)
- 将多个行和可变行移动到列(moving multiple and variable rows to columns)
- 提交表单时忽略基础href，而不使用Javascript(ignore base href when submitting form, without using Javascript)
- 对setOnInfoWindowClickListener的意图(Intent on setOnInfoWindowClickListener)
- Angular $资源不会改变方法(Angular $resource doesn't change method)
- 在Angular 5中不是一个函数(is not a function in Angular 5)
- 如何配置Composite C1以将.m和桌面作为同一站点提供服务(How to configure Composite C1 to serve .m and desktop as the same site)
- 不适用：悬停在悬停时：在元素之前[复制](Don't apply :hover when hovering on :before element [duplicate])
- 常见的python rpc和cli接口(Common python rpc and cli interface)
- Mysql DB单个字段匹配多个其他字段(Mysql DB single field matching to multiple other fields)
- 产品页面上的Magento Up出售对齐问题(Magento Up sell alignment issue on the products page)