javascript - If = one class, but has two classes -


i have validation script validates 2 different classes. want add additional class select boxes generate array onmouseover. problem is, select boxes have 2 classes, 1 validation, 1 array, , script doesn't recognize unless has exact name. if using == doesn't work @ all, using = tries validate elements on page, without classes.

i'm wondering how can make efficient without breaking rest of pages using script.

this example of html

<div class="select-styled">     <select id="pm" name="pm" class="selvalidate pmpop" onmouseover="pmpop();">         <option value="foo">foo</option>         <option value="">- remove -</option>     </select> </div>

here validation script

for (i=0; i<thisform.elements.length; i++) {         if (thisform.elements[i].classname = "selvalidate" || thisform.elements[i].classname == "req" || thisform.elements[i].classname == "valfocus") { //do stuff     } }

why don't use match()?

if (thisform.elements[i].classname.match('selvalidate')) {     // stuff }

you can't use assignment operator in if because that...assign. == comparison operator. seem want check if 1 css class set element has many..

so match() work better searches occurrence of string within string, rather comparing 2 string literals see if they're equal.

also, match() can accept regular expressions, can powerful. :)

edit:

per barney's comment, recommend using regular expression (as mentioned earlier) avoid false matches might have similar class name (e.g. selvalidate , selvalidateoff or that).

if (thisform.elements[i].classname.match(/\bselvalidate\b/)) {     // now, stuff }

both good, really. depends on how narrow want search be.

here nice cheat sheet getting started regular expressions in javascript.


Comments

Post a Comment

Popular posts from this blog

apache - Remove .php and add trailing slash in url using htaccess not loading css -

i have add following code htaccess file removing .php extension , add trailing slash urls. worked fine reduced page loading speed , css code not loading @ all. pages ugly. please help rewriteengine on rewritebase / ## hide .php extension snippet # externally redirect /dir/foo.php /dir/foo rewritecond %{the_request} ^[a-z]{3,}\s([^.]+)\.php [nc] rewriterule ^ %1/ [r,l] # add trailing slash rewritecond %{request_filename} !-f rewritecond %{request_uri} !/$ rewriterule . %{request_uri}/ [l,r=301] # internally forward /dir/foo /dir/foo.php rewritecond %{request_filename} !-d rewritecond %{request_filename}.php -f rewriterule ^(.*?)/?$ $1.php [l] we can rewrite urls using .htaccess files. before writing in .htaccess files need verify kind of server using. can check server adding a <?php phpinfo(); ?> in php page. ensure mod_rewrite module enabled in apache server. can identified checking phpinfo included page. common methods used url rewriting follows ...
Read more

inno setup - TLabel or TNewStaticText - change .Font.Style on Focus like Cursor changes with .Cursor -

is possible change .font.style on focus tlabel or tnewstatictext happens cursor when use .cursor ? there no built-in support track mouse hovering in inno setup @ time. however, intercepting window procedure of controls can track yourself. following example need innocallback library: [setup] appname=my program appversion=1.5 defaultdirname={pf}\my program outputdir=userdocs:inno setup examples output [files] source: "innocallback.dll"; destdir: "{tmp}"; flags: dontcopy [code] #ifdef unicode #define aw "w" #else #define aw "a" #endif const gwl_wndproc = -4; wm_mousemove = $0200; type wparam = uint_ptr; lparam = longint; lresult = longint; twindowproc = function(hwnd: hwnd; umsg: uint; wparam: wparam; lparam: lparam): lresult; function setcapture(hwnd: hwnd): hwnd; external 'setcapture@user32.dll stdcall'; function releasecapture: bool; external 'releasecapture@user32.dll stdcall'; func...
Read more