javascript - What is the best practice to not to override other bound functions to window.onresize? -

-

how dig javascript, find myself asking much. example have window.onresize event handler , if say:

window.onresize = resize;  function resize() {   console.log("resize event detected!"); }

wouldn't kill other functions connected same event , log message in console?

if think there should notifier tells me window resize event - or workaround maybe - without overriding other functions bound same event.

or totally confused usage?

you can save old onresize function , call either before or after custom resize function. example should work this:

var oldresize = window.onresize;  function resize() {     console.log("resize event detected!");     if (typeof oldresize === 'function') {         oldresize();     } } window.onresize = resize;

this method can have issues if there several onresize functions. save old onresize function part of closure , call old 1 after function. 

function addresizeevent(func) {     var oldresize = window.onresize;     window.onresize = function () {         func();         if (typeof oldresize === 'function') {             oldresize();         }     }; }  function foo() {     console.log("resize foo event detected!"); }  function bar() {     console.log("resize bar event detected!"); } addresizeevent(foo); addresizeevent(bar);

when call addresizeevent, pass function want register. takes old resize function , stores oldresize. when resize happens, call function , call old resize function. should able add many calls like.

in example, when window resizes, call bar, foo, whatever stored in window.resize (if there anything).


Comments

Post a Comment

Popular posts from this blog

c++ - How do I get a multi line tooltip in MFC -

-
right now, have tool tip pops when hover on edit box. problem tool tip contains multiple error messages , in 1 long line. need have each error message on own line. error messages contained in cstring new line seperating them. my existing code below. bool ontooltiptext(uint, nmhdr* pnmhdr, lresult* presult) { assert(pnmhdr->code == ttn_needtexta || pnmhdr->code == ttn_needtextw); // need handle both ansi , unicode versions of message tooltiptexta* pttta = (tooltiptexta*)pnmhdr; tooltiptextw* ptttw = (tooltiptextw*)pnmhdr; // tchar szfulltext[256]; cstring strtiptext=_t(""); uint nid = pnmhdr->idfrom; if (pnmhdr->code == ttn_needtexta && (pttta->uflags & ttf_idishwnd) || pnmhdr->code == ttn_needtextw && (ptttw->uflags & ttf_idishwnd)) { // idfrom hwnd of tool nid = ::getdlgctrlid((hwnd)nid); } //m_errprojaccel[ch] contains 1 or more error messages each...
Read more

asp.net - In javascript how to find the height and width -

-
i having .aspx , masterpage page. in masterpage loading aspx page . in aspx page design using generating table structure using code-behind server in javascript how find height , width . regards, kumar if you're looking table height , width, should it var tbl = document.getelementbyid('tbldemo'); alert(tbl.offsetwidth + '\n' + tbl.offsetheight);
Read more

c# - DataTable to EnumerableRowCollection -

-
i have datatable according client requirement can contain invalid date "00/00/1999",null,empty string.(typed datset) when collect them enumerables wish convert of invalid forms empty string. (i.e) enumerablerowcollection<datarow> query = order in _table.asenumerable() select new { orderdate= string.isnullorempty(convert.tostring(order.field<datetime>("orderdate")) || (how check date invalid date) ? string.empty : order.field<datetime>("orderdate") } how check whether date valid date or not? datetime.tryparse...like given current code: datetime date; enumerablerowcollection<datarow> query = order in _table.asenumerable() select new { orderdate= string.isnullorempty(convert.tostring(order.field<datetime>("orderdate")) || !datetime.tryparse(convert.tostring(order.field<datetime...
Read more