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MagnoliaKobus
12-26-2003, 10:24 PM
I'd like to know how can I remove the array elements in javascript .
fredmv
12-26-2003, 11:59 PM
Welcome to the forums.

Use the delete operator:delete foo[n];Where n is the element in the array you want to remove.
MagnoliaKobus
12-27-2003, 02:56 AM
I got it , Thanks for your help .
fredmv
12-27-2003, 03:14 AM
No problem. ;)
JayDie
03-25-2004, 05:16 AM
Yes, I understand that you can delete an entry by executing:
delete array[x]
But when I got this array:
var array= new Array()
array[array.length]='one'
array[array.length]='two'
array[array.length]='three'
array[array.length]='four'

and I say
delete array[1]
the enry with value 'two' will be deleted. Then, the content of the array isn't 'one, three, four' but 'one, undefined, three, four'.

I want that entry 1 is three and not undefined.

Is this possible with a excisting function or do I have to write my own?

JayDie
JayDie
03-25-2004, 06:24 AM
See the post before:

I quess I only can solve this problem if I get the entries of the array before the 'undefined' and get the entries of the array after the 'undefined' and create a new array which consists of the two new array's before...?

Using splice and/or slice...?

JayDie
JayDie
03-25-2004, 07:38 AM
...using slice and concat methods. NO use of delete.

<HTML>
<HEAD>
<SCRIPT language="JavaScript">
var tabel = new Array()

tabel[tabel.length]='een'
tabel[tabel.length]='twee'
tabel[tabel.length]='drie'
tabel[tabel.length]='vier'

function showArray()
{alert(tabel +', length = ' +tabel.length)
}

function remFromArray(pos)
{if(pos<tabel.length)
{
if(pos==0) // first entry
tabel = tabel.slice(1)
else if(pos==(tabel.length - 1)) //last entry
tabel = tabel.slice(0, -1)
else
{aBefore = tabel.slice(0,pos)
aAfter = tabel.slice(parseInt(pos) + 1)

tabel=new Array()
tabel = tabel.concat(aBefore, aAfter)
}
alert(tabel)
}
else
alert('fout')
}
</SCRIPT>

</HEAD>

<BODY>
<FORM>
<INPUT type=button onClick="showArray()" value="Show Array"><BR>
<INPUT type=text id=pos value=0>(zero based)<BR>
<INPUT type=button onClick="remFromArray(document.getElementById('pos').value)" value="Remove 'een' from Array"><BR>
</FORM>

</BODY>
</HTML>

Greetings... JayDie
steelersfan88
03-25-2004, 02:12 PM
A newer way to perform this is simply use the splice method of an array, yet this is new to browsers, so I am not sure how compatible it is:<script type="text/javascript">

var nums = new Array // create array of numbers
nums[nums.length] = "zero"
nums[nums.length] = "one"
nums[nums.length] = "two"
nums[nums.length] = "three"
nums[nums.length] = "four"

var temp = nums.splice(1,2) // remove nums 1 to 2 (remove one and two form array)
temp = "" // clear temp

alert(nums) // alert content of nums array

</script>