Control sum from input boxes in javascript -


i'm trying make controls in javascript when submit form in html.

evertyhing works except 1 needs check sum of 2 fields. 

<script type="text/javascript"> function validation() { var count=0; if((document.getelementsbyname("people")[0].selectedindex) == "")     {alert("how many people?"); count++;} else if((document.getelementsbyname("amount")[0].selectedindex) == "")     {alert("amount has @ least 1."); count++;} else if((document.getelementsbyname("deposit")[0].value) == "")     {alert("deposit cannot empty."); count++;} else if((document.getelementsbyname("deposit")[0].value) < "20")     {alert("deposit must @ least 20."); count++;} else if((document.getelementsbyname("topay")[0].value) == "")     {alert("mark 0 in pay if dont have pay more."); count++;} else if( (  (document.getelementsbyname("deposit")[0].value) + (document.getelementsbyname("topay")[0].value) ) < "40")     {alert("the minimum price of product 40"); count++;}  else if((document.getelementsbyname("seller")[0].value) == "")     {alert("who seller?"); count++;} else if(isnan(document.getelementsbyname("topay")[0].value))     {alert("to pay must number"); count++;} else if(isnan(document.getelementsbyname("people")[0].value))     {alert("people must number"); count++;} else if(isnan(document.getelementsbyname("deposit")[0].value))     {alert("deposit must number"); count++;} else if(isnan(document.getelementsbyname("amount")[0].value))     {alert("amount must number"); count++;} return (count==0); } </script>

the 1 i'm not able solve is:

else if( (((document.getelementsbyname("deposit")[0].value) + (document.getelementsbyname("topay")[0].value)) < "40)")     {alert("the minimum price of product 40"); count++;}

i want check if (deposit + topay) < 40. noticed code checking if (deposit < 40) , don't understand why.

can please me?

the '+' operator acts concatenation operator in conditional statement(or performs concatenation).

hence make perform addition operation use,

else if( ((parseint(document.getelementsbyname("deposit")[0].value) + parseint(document.getelementsbyname("topay")[0].value)) < 40))     {alert("the minimum price of product 40"); count++;}

Comments

Post a Comment

Popular posts from this blog

c++ - Difference between pre and post decrement in recursive function argument -

i have following sample code used pre-decrement void function(int c) { if(c == 0) { return; } else { cout << "dp" << c << endl; function(--c); cout << c << endl; return; } } this function give output input 4 : dp3 dp2 dp1 dp0 0 1 2 3 but when use post decrement void function(int c) { if(c == 0) { return; } else { cout << "dp" << c << endl; function(c--); cout << c << endl; return; } } output goes in infinite loop dp4 can explain me in detail why happens ? this happens because function(c--) called same value of c , when finishes c decremented. recursively called, hence called same value no chance of return , hit stack overflow error. assume this, int x = 1, y = 0; y = x++ result y == 1 , x == 2. if y = ++x , bot x , y 2.
Read more

php - Nothing but 'run(); ' when browsing to my local project, how do I fix this? -

i added new project. made mistake in projectname.conf file in sites-available apache2, led me reinstalling apache2. after reinstalling , re-enabling projects on every page of every project .. <body> run(); </body> .. i've run composer update, restarted service, restarted pc, checked config files, tried disabling new project. there nothing in error log, , access.log: 127.0.0.1 - - [15/may/2015:01:40:47 +0200] "get / http/1.1" 304 181 "-" "mozilla/5.0 (x11; ubuntu; linux x86_64; rv:38.0) gecko/20100101 firefox/38.0" maybe i'm forgetting apache2 reinstall? don't think did different last time installed it. looks haven't setup php correctly. take @ this great guide , maybe you're forgetting link php config apache2.
Read more

php - How can I echo out this array? -

i don't know how go grabbing data in variable , put foreach loop. class tree{ private $info = array( array('name'=>'jim','state'=>'nu','company'=>'nu','phone'=>array('cell'=>'5615111111','office'=>'5611111111'),'email'=>array('primary'=>'exs@example.com','ex@there.com')), array('name'=>'joe smith','city'=>'phoenix','phone'=>'4805551111','email'=>'jsmith@some_email.com'), array('name'=>'john doe','city'=>'chandler','company'=>'doe co.','email'=>array('jdoe@gmail.com','personal'=>'email@email.com'),'phone'=>'6025550002') ); } if you're inside of class, can access private variable using $this->variablename . example, i
Read more