Spłaszcz obiekt javascript, aby przejść jako querystring

Oto wersja nie-jQuery:

function toQueryString(obj) {
    var parts = [];
    for (var i in obj) {
        if (obj.hasOwnProperty(i)) {
            parts.push(encodeURIComponent(i) + "=" + encodeURIComponent(obj[i]));
        }
    }
    return parts.join("&");
}

Moja wersja ES6 (czysty Javascript, bez jQuery):

function toQueryString(paramsObject) {
  return Object
    .keys(paramsObject)
    .map(key => `${encodeURIComponent(key)}=${encodeURIComponent(paramsObject[key])}`)
    .join('&')
  ;
}

Oto kolejna wersja nie-jQuery, która wykorzystuje lodash lub underscore, jeśli używasz już jednej z tych bibliotek:

var toQueryString = function(obj) {
  return _.map(obj,function(v,k){
    return encodeURIComponent(k) + '=' + encodeURIComponent(v);
  }).join('&');
};

Spróbuj $.param() "metoda": {]}

var result = $.param({ cost: 12345, insertBy: 'testUser' });

To jest stare pytanie, ale na górze wyszukiwania Google, więc dodaję to dla kompletności.

Jeśli 1) nie chcesz używać jQuery, ale 2) chcesz ukryć zagnieżdżony obiekt do ciągu zapytania, to (budowanie na podstawie Tim Down i odpowiedzi faceta), użyj tego:

function toQueryString(obj, urlEncode) {
    //
    // Helper function that flattens an object, retaining key structer as a path array:
    //
    // Input: { prop1: 'x', prop2: { y: 1, z: 2 } }
    // Example output: [
    //     { path: [ 'prop1' ],      val: 'x' },
    //     { path: [ 'prop2', 'y' ], val: '1' },
    //     { path: [ 'prop2', 'z' ], val: '2' }
    // ]
    //
    function flattenObj(x, path) {
        var result = [];

        path = path || [];
        Object.keys(x).forEach(function (key) {
            if (!x.hasOwnProperty(key)) return;

            var newPath = path.slice();
            newPath.push(key);

            var vals = [];
            if (typeof x[key] == 'object') {
                vals = flattenObj(x[key], newPath);
            } else {
                vals.push({ path: newPath, val: x[key] });
            }
            vals.forEach(function (obj) {
                return result.push(obj);
            });
        });

        return result;
    } // flattenObj

    // start with  flattening `obj`
    var parts = flattenObj(obj); // [ { path: [ ...parts ], val: ... }, ... ]

    // convert to array notation:
    parts = parts.map(function (varInfo) {
        if (varInfo.path.length == 1) varInfo.path = varInfo.path[0];else {
            var first = varInfo.path[0];
            var rest = varInfo.path.slice(1);
            varInfo.path = first + '[' + rest.join('][') + ']';
        }
        return varInfo;
    }); // parts.map

    // join the parts to a query-string url-component
    var queryString = parts.map(function (varInfo) {
        return varInfo.path + '=' + varInfo.val;
    }).join('&');
    if (urlEncode) return encodeURIComponent(queryString);else return queryString;
}

Użyj jak:

console.log(toQueryString({
    prop1: 'x',
    prop2: {
        y: 1,
        z: 2
    }
}, false));

Które Wyjście:

prop1=x&prop2[y]=1&prop2[z]=2

Inna wersja:

function toQueryString(obj) {
    return Object.keys(obj).map(k => {
      return encodeURIComponent(k) + "=" + encodeURIComponent(obj[k])
    })
    .join("&");
}

var myObj = { cost: 12345, insertBy: 'testUser' },
    param = '',
    url   = 'http://mysite.com/mypage.php';    

for (var p in myObj) {
  if (myObj.hasOwnProperty(p)) {
    param += encodeURIComponent(p) + "=" + encodeURIComponent(myObj[p]) + "&";
  }
}

window.location.href = url + "?" + param;

Ogólny JavaScript:

function toParam(obj) {
  var str = "";
  var seperator = "";
  for (key in obj) {
    str += seperator;
    str += enncodeURIComponent(key) + "=" + encodeURIComponent(obj[key]);
    seperator = "&";
  }
  return str;
}


toParam({ cost: 12345, insertBy: 'testUser' })
"cost=12345&insertBy=testUser"

Możesz użyć tego

function serialize(obj)
{
    let str = []

    for(var p in obj)
    {
      if(obj.hasOwnProperty(p)) str.push(encodeURIComponent(p) + '=' + encodeURIComponent(obj[p]))
    }

    return str.join('&')
}

Spróbuj na JSFiddle pod tym linkiem https://jsfiddle.net/yussan/kwmnkca6/

ES6 Wersja Jrop ' s answer (również parses nested params)

const toQueryString = (obj, urlEncode = false) => {
  if (!obj) return null;
  const flattenObj = (x, path = []) => {
    const result = [];
    Object.keys(x).forEach((key) => {
      if (!Object.prototype.hasOwnProperty.call(x, key)) return;
      const newPath = path.slice();
      newPath.push(key);
      let vals = [];
      if (typeof x[key] === 'object') {
        vals = flattenObj(x[key], newPath);
      } else {
        vals.push({ path: newPath, val: x[key] });
      }
      vals.forEach((v) => {
        return result.push(v);
      });
    });
    return result;
  };

  let parts = flattenObj(obj);
  parts = parts.map((varInfo) => {
    if (varInfo.path.length === 1) {
      varInfo.path = varInfo.path[0]; // eslint-disable-line no-param-reassign
    } else {
      const first = varInfo.path[0];
      const rest = varInfo.path.slice(1);
      varInfo.path = `${first}[${rest.join('][')}]`; // eslint-disable-line no-param-reassign
    }
    return varInfo;
  });

  const queryString = parts.map((varInfo) => {
    return `${varInfo.path}=${varInfo.val}`;
  }).join('&');
  if (urlEncode) {
    return encodeURIComponent(queryString);
  }
  return queryString;
};