javascript - External JS Doc Not Working -


so i'm practicing javascript skills simple little script change heading size , color upon click. when run js within html doc within script tags works fine, when run page in browser, console gives me error: "uncaught typeerror: cannot read property 'addeventlistener' of null - (anonymous function) @ practice.js:13"

html code:

<!doctype html> <html> <head>     <title>javascript</title>     <link rel="stylesheet" href="main.css">     <script src="practice.js"></script> </head>  <body>     <h1 id="main-heading">hello</h1>      <p class="para">lorem ipsum dolor sit amet, consectetur adipisicing elit, sed eiusmod     tempor incididunt ut labore et dolore magna aliqua. ut enim ad minim veniam,     quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo     consequat.</p>      <p class="para">lorem ipsum dolor sit amet, consectetur adipisicing elit, sed eiusmod     tempor incididunt ut labore et dolore magna aliqua.</p> </body>  </html>

css code:

.red-text {         color: red;         font-size: 60px;         transition: 5s;     }  #main-heading {     font-size: 40px; }

javascript code:

// creates "h" var, containing main heading  var h = document.getelementbyid("main-heading");  // creates function adds .red-text class main heading  var addredclass = function() {     h.classname = h.classname + " red-text"; };  // activates addredclass function upon mouseover  h.addeventlistener('click', addredclass);

help?!

you should place javascript codes @ bottom of page this:

<!doctype html> <html> <head>     <title>javascript</title>     <link rel="stylesheet" href="main.css"> </head>  <body>     <h1 id="main-heading">hello</h1>      <p class="para">lorem ipsum dolor sit amet, consectetur adipisicing elit, sed eiusmod     tempor incididunt ut labore et dolore magna aliqua. ut enim ad minim veniam,     quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo     consequat.</p>      <p class="para">lorem ipsum dolor sit amet, consectetur adipisicing elit, sed eiusmod     tempor incididunt ut labore et dolore magna aliqua.</p>     <script src="practice.js"></script> </body>  </html>

because when call document.getelementbyid("main-heading") in head, there no main-heading element in document, on head loaded, should place javascript code @ bottom or use window.load function.


Comments

Post a Comment

Popular posts from this blog

c# - Validate object ID from GET to POST -

i have method allows user access comment have made on site. have post method lets them update comment. my normal solution send entire comment model through, let them update it, update on database when post back. involve sending commentid through in hiddenfor , can manipulated. how can verify commentid sent in get method same i'm getting in post , not able alter comment wish? how can verify commentid sent in method same i'm getting in post? basically have validate following things in post - user logged-in user. authenticated users post comments. commentid in post , should valid commentid , should present in database. userid associated logged-in user should same userid associated comment . comment should contain userid column, can check @ time of update. to make sure update happens comment has been sent in get - hold commentid in session , in post action compare commentid value in session .
Read more

node.js - Custom Model Validator SailsJS -

when using custom model validator checks record within model. return within spread doesn't seem end control flow. //post.js model /** * custom validator **/ types: { isuservalid: function(user_id) { var promise = require('bluebird'); promise.all([ user.findone({id: user_id}) ]) .spread(function(user) { console.log(user); if (user === null || user === undefined) { console.log('failed'); return false; }else{ console.log('passed'); return true; } }); } }, my response standard validation failed response. { "error": "e_validation", "status": 400, "summary": "1 attribute invalid", "model": "post", "invalidattributes": { "owner": [ { "rule": "isuservalid", ...
Read more

php - Find a regex to take part of Email -

i have following emails need extract part from: bestellnummer xxx: 1 von xxx, 1er pack ------------- anfang der nachricht ------------- foo bar baz foo bar baz // <<<<< need text here ------------- ende der nachricht ------------- ------------- anfang der nachricht ------------- foo bar baz foo bar baz ------------- ende der nachricht ------------- there 0 unlimited occurences of ------------- anfang der nachricht ------------- ------------- ende der nachricht ------------- and i'm able extract first part regex: $re = "/------------- .*? -------------.?(.*?).?------------- .*? -------------/s"; but, i'm quite new on learning regex, i'm pretty sure there must better regex extract part (foo bar baz foo bar baz) of text between ------------- anfang der nachricht ------------- ------------- ende der nachricht ------------- as can in different languages, i'm using .? to match between hyphens. i...
Read more