javascript - Uncaught TypeError: Cannot set property 'className' of null.active -


it's sign in button , form both contain in 1 id mainbutton box, each of them has different z-index. when click signin-btn, form show out. occur problem doesn't work when click button, , chrome dev tools shows

uncaught typeerror: cannot set property 'classname' of null'

seemly wrong javascript openform().

var button = document.getelementbyid('mainbutton');    var openform=function() {      button.classname = "active";  };  var checkinput = function(input) {      if (input.value.length > 0) {          input.classname = "active";      } else {          input.classname = "";      }  };
#mainbutton .active {       box-shadow: 0 19px 38px rgba(0, 0, 0, 0.3), 0 15px 12px rgba(0, 0, 0, 0.22);  }  #mainbutton .active .signin-form {      -webkit-transform: scale(1, 1);      -moz-transform: scale(1, 1);      -ms-transform: scale(1, 1);      -o-transform: scale(1, 1);      transform: scale(1, 1);  }
<div id="mainbutton">      <div class="signin-btn" onclick="openform();">          sign in      </div>      <div class="signin-form">          <div class="close-btn" onclick="closeform()">              ✘          </div>          <div class="form-title">              sign in          </div>          <div class="forminput-group">              <input type="text" id="name" onblur="checkinput(this)">              <label for="name">username</label>          </div>          <div class="forminput-group">              <input type="password" id="password" onblur="checkinput(this)">              <label for="password">username</label>          </div>          <div class="form-btn">              go          </div>      </div>

there additional space in css selector. should be:

#mainbutton.active {      box-shadow: 0 19px 38px rgba(0, 0, 0, 0.3), 0 15px 12px rgba(0, 0, 0, 0.22); } #mainbutton.active .signin-form {     -webkit-transform: scale(1, 1);     -moz-transform: scale(1, 1);     -ms-transform: scale(1, 1);     -o-transform: scale(1, 1);     transform: scale(1, 1); }

also make sure script placed after rest of html.

corrected code snippet:

var button = document.getelementbyid('mainbutton');    var openform=function() {      button.classname = "active";  };  var checkinput = function(input) {      if (input.value.length > 0) {          input.classname = "active";      } else {          input.classname = "";      }  };
#mainbutton.active {       box-shadow: 0 19px 38px rgba(0, 0, 0, 0.3), 0 15px 12px rgba(0, 0, 0, 0.22);  }  #mainbutton.active .signin-form {      -webkit-transform: scale(1, 1);      -moz-transform: scale(1, 1);      -ms-transform: scale(1, 1);      -o-transform: scale(1, 1);      transform: scale(1, 1);  }
<div id="mainbutton">      <div class="signin-btn" onclick="openform();">          sign in      </div>      <div class="signin-form">          <div class="close-btn" onclick="closeform()">              ✘          </div>          <div class="form-title">              sign in          </div>          <div class="forminput-group">              <input type="text" id="name" onblur="checkinput(this)">              <label for="name">username</label>          </div>          <div class="forminput-group">              <input type="password" id="password" onblur="checkinput(this)">              <label for="password">username</label>          </div>          <div class="form-btn">              go          </div>      </div>


Comments

Post a Comment

Popular posts from this blog

get url and add instance to a model with prefilled foreign key :django admin -

Image
i have page in each contest shown in row. each row contains contest id , link other model names have foreign key contest. news model: class news(models.model): title = models.charfield(max_length=50, null=true) description = models.textfield() time = models.timefield( default= datetime.datetime.now().time()) contest = models.foreignkey(contest) i want use admin adding , changing these models. want when user clicks on 'news' has foreign key contest id=1, shows list of news value foreign key. use {% instance in instances %} <tr class="{% cycle 'row1' 'row2' %}"> <td>{{ instance.title }}</td> <td>{{ instance.starttime }}</td> <td>{{ instance.timespan }}</td> <td>{{ instance.date }}</td> <td><a href="/adm...
Read more

css - Make div keyboard-scrollable in jQuery Mobile? -

from can tell, although jquery-mobile-powered pages can contain divs overflow set scroll or auto, , these divs can scrolled one-screen bar or mouse wheel, cannot scrolled using arrow keys, page-up/page-down, or home/end. instead, official "page" div (with data-role="page") absorbs input. perhaps other divs can't acquire focus, i'm not sure. is there way around this? edit: jsfiddle of simple example: https://jsfiddle.net/qogz0shx/ <script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.4/jquery.min.js"></script> <script src="https://ajax.googleapis.com/ajax/libs/jquerymobile/1.4.5/jquery.mobile.min.js"> </script> <link rel="stylesheet" href="https://code.jquery.com/mobile/1.4.5/jquery.mobile-1.4.5.css"/> <style> #outer { overflow:scroll; height: 50vh; width: 50vw; } #inner { height: 500vh; width: 500vw; } ...
Read more

ruby on rails - Seeing duplicate requests handled with Unicorn -

recently upgraded our ec2 instances c3.large in order boost more unicorn workers handle increased traffic our site. (6xworkers per machine - 2 ec2 instances). when did this, started seeing duplicate records being created! looks somehow, maybe 2 unicorn workers attempting process same request? in nginx logs see 1 [post] request particular rails controller - yet 2 records being created in database. i'm hitting kind of race condition issue - have no idea how debug this. doesn't happen time, when it's frustrating well. noticed 2 database records within 5 seconds of each other. (and yes disable button when user clicks submit button). unicorn 4.8.2 ruby 1.9.3 rails 3.2.14 any great! thanks! although may not fix problem, upgrade ruby 2.0.0. there blog mentioning idea upgrade ruby 2.0.0 if using unicorn. for example: https://www.digitalocean.com/community/articles/how-to-optimize-unicorn-workers-in-a-ruby-on-rails-app specifically: if using ruby 1.9, ...
Read more