javascript - Preferences given for html control attributes for attributes with the same value -


what preferences given html control attributes if 2 attributes have same value id="xyz" name="xyz" ?

my piece of code shown :

<iframe scrolling="no" width="100%" name="topframe" id="topframe" frameborder="0" height="100%" runat="server"></iframe>

i'm trying access iframe via attribute. when call iframe javascript:parent.frames['topframe'] value 1 of them preferred

the first thing note window.frames just alias window:

the window, frames, , self idl attributes must return window object's browsing context's windowproxy object.

the relevant part of specification here:

the supported property names @ moment consist of following, in tree order, ignoring later duplicates:

  • the browsing context name of child browsing context of active document name not empty string,
  • the value of name content attribute a, applet, area, embed, form, frameset, img, , object elements in active document have non-empty name content attribute, and
  • the value of id content attribute of html element in active document non-empty id content attribute.

so doesn't matter 1 "preferred".

if id , name of element same, 1 used determine name , other ignored. if id="a" used , name="a" ignored, a. if other way around, still a.

if id , name of element different, can both used reference it.

if 2 different elements share value between name , id attributes, whichever element comes first take name. particular attribute used doesn't matter.

use of id , name attributes directly not recommended. can clash existing properties of window object. better use getelementbyid or queryselector can explicitly looking element in dom.


Comments

Post a Comment

Popular posts from this blog

python - Operations inside variables -

this question has answer here: evaluating mathematical expression in string 12 answers i want make python script finds maximum possible output using 2 operations. problem says there syntax error @ 2nd last line, in b in there. how can fix it? x = 0 = int(input("1st number:")) c = int(input("2nd number:" )) e = int(input("3rd number:" )) in range(4): if == 0: b = "+" elif == 1: b = "-" elif == 2: b = "/" else: b = "*" j in range(4): if j == 0: d = "+" elif j == 1: d = "-" elif j == 2: d = "/" else: d = "*" k = b c d e print(k) if you're after variables e on single line, couldn...
Read more

Generic Map Parameter java -

i having lot of methods of type: public static list<eduusers> getdetails(class c, map<string, integer> params) { list<eduusers> details = null; session session = hibernateutil.getsessionfactory().opensession(); transaction tx = null; try { tx = session.begintransaction(); criteria cr = session.createcriteria(c); (map.entry<string, integer> entry : params.entryset()) { cr.add(restrictions.eq(entry.getkey(), entry.getvalue())); } details = cr.list(); tx.commit(); } catch (exception asd) { log.debug(asd.getmessage()); if (tx != null) { tx.commit(); } } { session.close(); } return details; } i trying have generic method them , have written far: public static <t> list<t> getdetails(class<t> c, class<t> b) { l...
Read more

arrays - What causes a java.lang.ArrayIndexOutOfBoundsException and how do I prevent it? -

what arrayindexoutofboundsexception mean , how rid of it? here code sample triggers exception: string[] name = {"tom", "dick", "harry"}; for(int = 0; i<=name.length; i++) { system.out.print(name[i] +'\n'); } your first port of call should documentation explains reasonably clearly: thrown indicate array has been accessed illegal index. index either negative or greater or equal size of array. so example: int[] array = new int[5]; int boom = array[10]; // throws exception as how avoid it... um, don't that. careful array indexes. one problem people run thinking arrays 1-indexed, e.g. int[] array = new int[5]; // ... populate array here ... (int index = 1; index <= array.length; index++) { system.out.println(array[index]); } that miss out first element (index 0) , throw exception when index 5. valid indexes here 0-4 inclusive. correct, idiomatic for statement here be: for (int index = 0; index <...
Read more