javascript - isolating specific values in external .js array -



javascript - isolating specific values in external .js array -

i'm trying populate selection list external javascript array. works i'm trying populate values using id column, failing. i'm using check-boxes , 'if' statement see box checked, , populate appropriate array values based on selection. i'm using 'if' within loop match id value in array, , add together matching values selection. however, seems disregarding status , reading entire array in selection list. obvious error code novice.

function populateislandlist () {

var form = document.forms["island_form"]; var islands = form.islands; if (islands[0].checked){alert("works"); (i = 0; < pislands.length; i++) if (pislands[i][1] = 1){ document.forms["location"].islands.options[i] = new option(pislands[i][0], i)}}; if (islands[1].checked){alert("works"); (i = 0; < pislands.length; i++) if (pislands[i][1] = 2){ document.forms["location"].islands.options[i] = new option(pislands[i][0], i)}}; }

your first error here:

var islands = document.getelementbyid("island_form");

document.getelementbyid() returns single dom element, not list of objects. so, islands[0] , islands[1] going undefined , islands[0].checked create script error.

you can have 1 dom element given id. can have multiple elements class name maybe should switch using class names , using document.getelementsbyclassname("something")

fyi, should looking in browser error console or debug console see script errors should have given indication of problem here.

javascript arrays if-statement

Comments

Post a Comment

Popular posts from this blog

java Multi query from Mysql using netbeans -

java Multi query from Mysql using netbeans - i have java code retrieve info mysql appropriate code in netbeans.the code below. want multi query such illustration finding total number of products , on.could help me please. in advance import java.sql.*; public class javamysqlselectexample { public static void main(string[] args) { seek { string mydriver = "com.mysql.jdbc.driver"; string myurl = "jdbc:mysql://localhost/sample"; class.forname(mydriver); connection conn = drivermanager.getconnection(myurl, "root", "mypasscode1"); string query = "select * products"; statement st = conn.createstatement(); resultset rs = st.executequery(query); while (rs.next()==true) { int code = rs.getint("code"); string productname = rs.getstring("product_name"); string producttype = rs.getstring("product_type"); system.out.format(" %d, %s, %s\n", code, pr
Read more

c# - DotNetZip fails with "stream does not support seek operations" -

c# - DotNetZip fails with "stream does not support seek operations" - i using dotnetzip in c# unzip stream follows: public static void unzipfromstream(stream stream, string outdir) { //omit seek grab block using (zipfile zip = zipfile.read(stream)){ foreach (zipentry e in zip){ e.extract(outdir, extractexistingfileaction.overwritesilently); } } } stream obtained using webclient client = new webclient(); stream fs = client.openread(url); however, got next exception exception during extracting zip stream system.notsupportedexception: stream not back upwards seek operations. @ system.net.connectstream.get_position() @ ionic.zip.zipfile.read(stream zipstream, textwriter statusmessagewriter, encoding encoding, eventhandler`1 readprogress) on server side(asp.net mvc 4), returning filepathresult or filestreamresult both caused exception. should obtain stream differently on client side? or how create server homec
Read more

c++ - StartServiceCtrlDispatcher don't can access 1063 error -

c++ - StartServiceCtrlDispatcher don't can access 1063 error - i write on c++ service , have error, , don't can fixed it. my service main function int main (int argc, tchar *argv[]) {dword f; for(int i=0;i<113;i++) f = getlasterror(); servicepath = lptstr(argv[0]); outputdebugstring(_t("my sample service: main: entry")); //installservice(); service_table_entry servicetable[] = { {service_name, (lpservice_main_function) servicemain}, {null, null} }; // startservice(); if(!startservicectrldispatcher(servicetable)) { f = getlasterror(); //addlogmessage("error: startservicectrldispatcher"); } else if( memcmp(argv[argc-1],"install",7)) { installservice(); } else if( memcmp(argv[argc-1],"remove",6)) { removeservice(); } else if( memcmp(argv[argc-1],"start",5)) { startservice(); } else if( memcmp(argv[argc-1],"stop",4))
Read more