Delete from array in javascript

3 hours ago, I asked a question in SO , about deleting a part of an object, so I linked this question to it:

delete a part of object in javascript

but now another problem occurred when I deleted from that array. I use that object to populate a FlexiGrid. but when I delete an item from that object by following code, instead of delete that item , it sets to undefined :( and flexigrid did not accept it for input data.

for (var i = 0; i < Roomdata.length; i++) {

    if(Roomdata[i].id = X) {

        delete Roomdata[i];
        break;

    }
}

For example, imagine I have 3 items in Roomdata like this :

{item1, item2, item3}

When I call this code to delete item2 , Roomdata object looks like this :

{item1, undefined, item3}

and this is a bad format to be accepted by flexigrid as input data

Is there any solution ?

Thanks every body and sorry about my bad syntax (I am new in English)

regards , Foroughi

Walk through the array in reverse order, and use .splice to remove the element.
You have to walk in the reverse order, because otherwise you end up skipping elements ^{See below}.

for (var i = Roomdata.length-1; i >= 0; i--) {
    if (Roomdata[i].id == X) {
        Roomdata.splice(i, 1);
        break;
    }
}

What happens if you don't walk in the reverse order:

// This happens in a for(;;) loop:
// Variable init:
var array = [1, 2, 3];
var i = 0;

array.splice(i, 1); // array = [2, 3]   array.length = 2
// i < 2, so continue
i++;  // i = 1    

array.splice(i, 1); // i=1, so removes item at place 1: array = [2]
// i < 1 is false, so stop.

// array = [2]. You have skipped one element.

What you have is an Array. You should use the splice() method to remove an element from an array, not by deleteing the element.

for (var i = 0; i < Roomdata.length; i++) {

    if(Roomdata[i].id = X) {

        Roomdata.splice(i, 1);
        break;

    }
}

Using splice in spite of delete.

 Roomdata.splice(i, 0);

splice attribute removes blank string elements, undefined references, NULLs and FALSEs.

it will solve your problem

Delete from array in javascript

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