How do I iterate over a JSON structure? [duplicate]

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生来不讨喜

2020-11-22 02:58

var arr = [ {"id":"10", "class": "child-of-9"}, {"id":"11", "classd": "child-of-10"}];

for (var i = 0; i < arr.length; i++){
    var obj = arr[i];
    for (var key in obj){
        var attrName = key;
        var attrValue = obj[key];
    }
}

var arr = [ {"id":"10", "class": "child-of-9"}, {"id":"11", "class": "child-of-10"}];
    
for (var i = 0; i < arr.length; i++){
  document.write("<br><br>array index: " + i);
  var obj = arr[i];
  for (var key in obj){
    var value = obj[key];
    document.write("<br> - " + key + ": " + value);
  }
}

note: the for-in method is cool for simple objects. Not very smart to use with DOM object.

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旧巷少年郎

2020-11-22 02:59

this is a pure commented JavaScript example.

  <script language="JavaScript" type="text/javascript">
  function iterate_json(){
            // Create our XMLHttpRequest object
            var hr = new XMLHttpRequest();
            // Create some variables we need to send to our PHP file
            hr.open("GET", "json-note.php", true);//this is your php file containing json

            hr.setRequestHeader("Content-type", "application/json", true);
            // Access the onreadystatechange event for the XMLHttpRequest object
            hr.onreadystatechange = function() {
                if(hr.readyState == 4 && hr.status == 200) {
                    var data = JSON.parse(hr.responseText);
                    var results = document.getElementById("myDiv");//myDiv is the div id
                    for (var obj in data){
                    results.innerHTML += data[obj].id+ "is"+data[obj].class + "<br/>";
                    }
                }
            }

            hr.send(null); 
        }
</script>
<script language="JavaScript" type="text/javascript">iterate_json();</script>// call function here

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佛祖请我去吃肉

2020-11-22 03:05

With nested objects, it can be retrieve as by recursive function:

function inside(events)
  {
    for (i in events) {
      if (typeof events[i] === 'object')
        inside(events[i]);
      else
      alert(events[i]);
    }
  }
  inside(events);

where as events is json object.

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夕颜

2020-11-22 03:06

You can use a mini library like objx - http://objx.googlecode.com/

You can write code like this:

var data =  [ {"id":"10", "class": "child-of-9"},
              {"id":"11", "class": "child-of-10"}];

// alert all IDs
objx(data).each(function(item) { alert(item.id) });

// get all IDs into a new array
var ids = objx(data).collect("id").obj();

// group by class
var grouped = objx(data).group(function(item){ return item.class; }).obj()

There are more 'plugins' available to let you handle data like this, see http://code.google.com/p/objx-plugins/wiki/PluginLibrary

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孤街浪徒

2020-11-22 03:08

Taken from jQuery docs:

var arr = [ "one", "two", "three", "four", "five" ];
var obj = { one:1, two:2, three:3, four:4, five:5 };

jQuery.each(arr, function() {
  $("#" + this).text("My id is " + this + ".");
  return (this != "four"); // will stop running to skip "five"
});

jQuery.each(obj, function(i, val) {
  $("#" + i).append(document.createTextNode(" - " + val));
});

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温柔的废话

2020-11-22 03:09

Use for...of:

<html>
<body>
<script type="text/javascript">

  var mycars = [{name:'Susita'}, {name:'BMW'}];

  for (var car of mycars) 
  {
    document.write(car.name + "<br />");
  }

</script>
</body>
</html>

Will result in:

Susita
BMW

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