what does + .$blah + do?

[mattjtayl]

I was sifting through some php code and was wondering what  does

 

"statements" + .$blah +

 

do?

 

for example

 

distcol_id.innerHTML=
"<select name='paytype_distribution_id_" + paytype_id + "_new_" + new_count + "' 
onchange=\"geturl_editemployees_distribution_reset
('" + paytype_id + "','new_" + new_count + "')\"

 

what about "_new_"  is that a php command or just a variable?

 

how about .

postOBJ.addpost(theElement.name,'n');

what does  .addpost do or postOBJ

 

also im trying to piece together what this is supose to do:

onchange="geturl_editemployees_deduction_reset('<?=$ded_row['id']?>')"
onblur=
"if(this.value=='none')
{geturl_edit_employees_deduction_checkdelete(this.parentNode.parentNode.rowIndex-1);}">

 

what does this.parenNode do? this . ?

 

what does  .rowindex -1 do?

 

 

 

[Guest]

Hi,

 

Sorry, but what you've presented is predominantly javascript and not PHP.

 

But to answer your questions:

 

The + operator in javascript is used either for mathematical operations (ie. 5 + 4) or for concatenating/connecting strings ("hello" + " world" will equal "hello world")

 

However, in your example ("statements" + .$blah + ) you present a strange hybrid of PHP and Javascript... So moving on:

 

as for "_new_" -- that is neither a php command nor a variable, it is a literal string value.

 

I have a feeling you don't understand OOP, nor do you know about the DOM--without which explaining postOBJ, addpost or parentNode, etc. would be too difficult.

[kratsg]

nodes and parents are part of JavaScripts DOM structure, research that a bit and you'll see how it pieces together.

 

the "something"+.$blah.+"something" is a weird mix, first of all, javascript adds a variable to strings using "+" signs, php with periods (concatenating) so having a mix is bugging me out here, since the fact is that $blah is a string and you don't add a string to a string unless you have quotation marks around it (javascript speak).

[mattjtayl]

actually I did take a Java class and majored in Information Systems, but that was 4 years ago so my knowledge is a little foggy. So somethings I am relearning.

 

If somone could tell me what postOBJ.addpost  and .this does I would appreciate it

 

I know (this) is like a reference in java?

 

I did learn about the DOM in my java class I believe. But I forgot it and I only got a basic understanding from it.

 

and I know nodes are a part of tree. Each element in html is part of the node. So I think parenNode calls what is attached to that node?