Looping Thru Elements on a Form

Classic Servoy
1

Hello,

I normally use the first loop to cycle thru elements on a form. However, I thought the second method was equivalent, yet the second method loops twice as many times as the first. What I am not understanding?

var formElements = forms.test_form.elements;

for (var i = 0; i < formElements.length; i++)
{
	application.output(formElements[i].getName());
}

application.output("\n");

for (var i in formElements)
{
	application.output(formElements[i].getName());
}
2

Hi Sean

I can’t comment on difference between your loops but for info I have run into an occasional problem on 3.0rc1

This code will run fine for a time but after returning from Layout mode sometimes fails at the getName line.

	for ( var i in elements)
	{
		if (elements[i].getName().slice(0,3) == 'tab')
		 . . . . . .  .

Understand the following code is recommended

var vElemArray = elements.allnames
for (var i=0 ; i<vElemArray.length ; i++)
{
	if (vElemArray[i].getName().slice(0,3) == 'tab')
    { 
		.....

Might even run quicker in your tests . . . .

Regards

Graham Greensall
Worxinfo Ltd

3

Hi Graham,

I’ll just stick with the first loop, but the second one just looks more elegant :)

Anyway, I just hope there isn’t a generic problem when looping thru objects using the second method.