javascript - elements are not defined at the time the script is executed -


i'm trying data attribute of elements, when object created, elements aren't loaded yet (which understand). question best (or any) solution need use object in 2 separate functions don't interact each other?

function data_num_array(){     this.data_num_array=$("*[data-num]"); }  data_num_array.prototype.get_data_num_array_element=function(string_val){     var data_num_of_element;     for(var i=0;i<this.data_num_array.length;i++){         if(this.data_num_array[i].id===string_val){             data_num_of_element=$(this.data_num_array[i]).attr("data-num");             break;         }     }     return data_num_of_element; };  function call_me(){     console.log(obj.get_data_num_array_element("div")); }

if there's syntax error here it's not issue, case of question.

var obj=new data_num_array();  $(document).ready(function(){     console.log(obj.get_data_num_array_element("div")); });  $("#click").click(function(){     console.log(obj.get_data_num_array_element("click")); });  <html>     <head>     </head>     <body>         <div id="div" data-num="1"></div>         <button id="click" data-num="2"></button>     </body> </html>

if you're new javascript, might worth reading on scoping: mdn: variable scoping

in short, obj needed across 2 functions, can leverage scoping ensure both $(document).ready , $("#click") have access obj. obj, on other hand, needs wait until document ready. can hold off on instantiating data_num_array $(document).ready callback function you're using.

with bit of rearranging:

function data_num_array(){     this.data_num_array=$("*[data-num]"); }  data_num_array.prototype.get_data_num_array_element=function(string_val){     var data_num_of_element;     for(var i=0;i<this.data_num_array.length;i++){         if(this.data_num_array[i].id===string_val){             data_num_of_element=$(this.data_num_array[i]).attr("data-num");             break;         }     }     return data_num_of_element; };  $(document).ready(function(){   var obj=new data_num_array();    console.log(obj.get_data_num_array_element("div"));    $("#click").click(function(){     console.log(obj.get_data_num_array_element("click"));   }); });

now, we're waiting set new data_num_array , click event.

also, had small bug in click handler calling obj.get_data_num_array_element("button") instead of obj.get_data_num_array_element("click"). (you gave <button> id of "click".)

on more opinionated side, consider using camelcase variable names. less characters type. ;)


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