Javascript: Filtering twodimensional array

There's plenty examples available on how to sort an javascript array based on it's numeric values. What 开发者_开发百科would however be appropriate way to fetch all elements from myArray with the property prop1 with it's according value value1?

Here's my array:

var myArray = [
{
    "id":"2",
    "name":"My name",
    "properties":{"prop1":"value1"}
}];

Thanks

You can just access it by dot or bracket notation and push the matching members to your new/filtered array, for example:

var newArray = [];
for(var i=0, l = myArray.length; i<l; i++) {
  if(myArray[i].properties.prop1 == "value1") newArray.push(myArray[i]);
}

Your question is a bit ambiguous though, if you're trying to get the {"prop1":"value1"} object, not the parent, then just change newArray.push(myArray[i]) to newArray.push(myArray[i].properties).

Provide a compare function to sort by arbitrary properties:

function compareMyObjects(a, b) {
  var valA = a.properties.prop1.value1;
  var valB = b.properties.prop1.value1;

  if(valA > valB) return 1;
  if(valA < valB) return -1;
  return 0;
}

myArray.sort(compareMyObjects);

https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/Array/sort

Go through each element in your array. For each element, check each property to see if it matches the one you're looking for.

function filterArray(array, property, value) {
    var newArray = [];
    for (var i = 0; i < array.length; i++) {
        for (var j in array[i].properties) {
            if (j === property && array[i].properties.hasOwnProperty(j)) {
                if (array[i].properties[j] == value) {
                    newArray.push(array[i]);
                }
            }
        }
    }
}

var newarray=myarray.filter(function(itm){
   return itm.properties.prop1==='value1';
});

Filter, like the array methods indexOf and map, may be worth providing for browsers that don't have it- this version is from Mozilla Developer Site-

if(!Array.prototype.filter){
    Array.prototype.filter= function(fun, scope){
        var L= this.length, A= [], i= 0, val;
        if(typeof fun== 'function'){
            while(i< L){
                if(i in this){
                    val= this[i];
                    if(fun.call(scope, val, i, this)){
                        A[A.length]= val;
                    }
                }
                ++i;
            }
        }
        return A;
    }
}