javascript - Can't get text to change with a button click -


i'm trying change line of text, inside form; more specifically, want text change under conditions. conditions check when user clicks button. in case want text change when user leave input field blank. code includes entire form i'm working , script. problem i'm having text seem change when button clicked second or long alert message up. afterwards, goes original text. line in script accessing 5th line of code.

<div id="userregistration"> <!--  registration form shell -->              <form name="registration">             <div id="leftsideform"> <!--  left side of registration form -->                  <span style="color:red">*</span>                 enter username: <input type="text" name="username" /> <br />                  <b id="yy">test </b> <br />                  <span style="color:red">*</span>                 enter password: <input type="password" name="userpassword" /><br />                  <span style="color:red">*</span>                 confirm password: <input type="password" name="cuserpassword" /><br /> <br /> <br />                  <span style="color:red">*</span>                 first name: <input type="text" name="firstname" /><br />                  middle initial: <input type="text" name="middlename" /><br />                  <span style="color:red">*</span>                 last name: <input type="text" name="lastname" /><br /> <br />              </div> <!-- end of left sideform -->              <div id="rightsideform">                  <span style="color:red">*</span>                 email address: <input type="text" name="useremail" /><br />                  <span style="color:red">*</span>                 confirm email: <input type="text" name="confirmuseremail" /><br /> <br /> <br /> <br />                  <button type="submit" onclick="validateusername()" >register</button>             </div> <!-- end of right sideform -->              </form>  </div> <!-- end of registration -->   <script type="text/javascript"> function validateusername() { var x=document.forms["registration"]["username"].value; if (x == null || x== "") { document.getelementbyid("yy").innerhtml = "why won't work grrrr"; alert("first name must filled out"); } } </script>

the problem not stopping form submission event. in case can done via return validateusername() in onclick , return false in validateusername function on failure:

http://jsfiddle.net/rqudt/

however better use standard event registration (via addeventlistener , use event object's preventdefault method stop default click behavior.

http://jsfiddle.net/rqudt/1/


Comments

Post a Comment

Popular posts from this blog

Why does Ruby on Rails generate add a blank line to the end of a file? -

running rails generate controller foo home results in: class foocontroller < application controller def home end end (there's nothing on line in actual file, blank line) is there purpose blank line? it's common use newline indicate end of line, last line. many editors (like vi, use) add in newline silently. consensus text files (especially in unix world) should end in newline, , there have been problems historically if wasn't present. why should text files end newline? the tool used count lines in file "wc" counts newlines in file, without trailing newline show 3 instead of 4. it improves readability of templates used in generator. consider: https://github.com/rails/rails/blob/master/railties/lib/rails/generators/rails/controller/templates/controller.rb to remove trailing newline, template have last line of: end<% end -%> instead of: end <% end -%> that seems less readable me. the discussion below refers
Read more

keyboard - Smiles and long press feature in Android -

i've created android keyboard. how add features inserting smilies, , using long keypresses display symbols? to create long-press behavior allows select several options pop-up menu, follow guide (specifically pop-up menu section): http://developer.android.com/guide/topics/ui/menus.html smileys (also known emoticons) combination of keys, understood programs , parsed same way. have do, when clicks smiley face on keyboard, simulate pressing of key combination matching emoticon. example, when clicks smiley, should simulate key presses ':' , ')' :). here's list of emoticons: http://en.wikipedia.org/wiki/list_of_emoticons
Read more

node.js - Bad Request - node js ajax post -

i'm using express 3.0 , node v0.11.0. have button submits form , i'm using ajax post data json object node server. client code is: $('#contact').submit(function(e) { console.log('submit called'); var formdata = json.stringify($('form').serializeobject()); console.log(formdata); $.ajax({ url: "http://localhost:3000/savedata/", type: "post", datatype: 'json', data: {objectdata: formdata}, contenttype: "application/json", complete: function() { console.log('process complete'); }, success: function(data) { console.log('process sucess'); }, error: function() { console.log('process error'); }, }); return false; }); then on server: var express = require('express'); var app = express(); app.set('views', __dirname + '/views'); app.set('view engine', 'jade'); app.use(express.bodyparser());
Read more