How to empty an array?

Question

Yesterday I ask a question about json

Link: How to return an array from jQuery ajax success function and use it in a loop?

And one of the answers was this

setInterval(updateTimestamps,30000);
var ids = new Array();

function updateTimestamps(){
    $(".timestamp").each(function(i){
    var obj = new Object();
    obj.id = $(this).attr("postID");
    obj.timestamp = $(this).attr("postdate");
        ids.push(obj);
    }

    $.post("http://site.com/ajax/humanTime.php", {"time": ids}, function(data) {
        for (i = 0; i < data.length; i++) {
            $("#" + data[i].id).html(data[i].content);
        }
    }, "json");
}

The problem with this script is that the data is dublicated

The first time when this is executed is something like this

Array
(
    [0] => Array
        (
            [id] => 26629
            [timestamp] => 1332273712
        )

    [1] => Array
        (
            [id] => 26628
            [timestamp] => 1332243526
        )

    [2] => Array
        (
            [id] => 26627
            [timestamp] => 1332237777


)

And the second time is

Array
(
    [0] => Array
        (
            [id] => 26629
            [timestamp] => 1332273712
        )

    [1] => Array
        (
            [id] => 26628
            [timestamp] => 1332243526
        )

    [2] => Array
        (
            [id] => 26627
            [timestamp] => 1332237777
        )

    [3] => Array
        (
            [id] => 26629
            [timestamp] => 1332273712
        )

    [4] => Array
        (
            [id] => 26628
            [timestamp] => 1332243526
        )

    [5] => Array
        (
            [id] => 26627
            [timestamp] => 1332237777
        )

)

I try with var ids= Array(); , vas ids = []; but that dosent work

Did you check what the PHP script itself returns ?

tereško
– tereško

2012-03-21 07:19:05 +00:00
Commented Mar 21, 2012 at 7:19 — tereško
– tereško, Commented Mar 21, 2012 at 7:19

KooiInc · Accepted Answer · 2012-03-21 07:22:12Z

3

A short way to reset an array: ids.length = 0;. So

function updateTimestamps(){
  ids.length = 0;
  // [...]
}

answered Mar 21, 2012 at 7:22

KooiInc

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Comments

Salman Arshad · Accepted Answer · 2012-03-21 07:26:19Z

3

Set ids = [] before you start pushing new items. Here is your code, re-factored:

var ids;

function updateTimestamps() {
    ids = []; // <-- the answer
    $(".timestamp").each(function(i) {
        ids.push({
            id: $(this).attr("postID"),
            timestamp: $(this).attr("postdate")
        });
    });
    $.post("http://site.com/ajax/humanTime.php", {"time": ids}, function(data) {
        for (var i = 0; i < data.length; i++) {
            $("#" + data[i].id).html(data[i].content);
        }
    }, "json");
}

setInterval(updateTimestamps, 30000);

edited Mar 21, 2012 at 7:26

answered Mar 21, 2012 at 7:18

Salman Arshad

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Comments

Fabrizio Calderan · Accepted Answer · 2012-03-21 07:19:11Z

2

try this:

var ids;

function updateTimestamps(){
  ids = [];
   ...

answered Mar 21, 2012 at 7:19

Fabrizio Calderan

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Comments

Dogbert · Accepted Answer · 2012-03-21 07:19:11Z

2

After

function updateTimestamps(){

Add

ids = [];

answered Mar 21, 2012 at 7:19

Dogbert

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Comments

xdazz · Accepted Answer · 2012-03-21 07:21:45Z

2

setInterval(updateTimestamps,30000);

function updateTimestamps(){
    var ids = []; // put it here

    $(".timestamp").each(function(i){
    var obj = {};
    obj.id = $(this).attr("postID");
    obj.timestamp = $(this).attr("postdate");
        ids.push(obj);
    }

    $.post("http://site.com/ajax/humanTime.php", {"time": ids}, function(data) {
        for (i = 0; i < data.length; i++) {
            $("#" + data[i].id).html(data[i].content);
        }
    }, "json");
}

answered Mar 21, 2012 at 7:21

xdazz

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