Knowledge Base - .NET, C#, SQL Server 2005, PHP and Actionscript 2.0 / 3.0 etc

Easy peasy lemon squeezy:

7 * Math.round(12 / 7); // returns 14
7 * Math.round(2 / 7); // returns 0

You might also want to check the value is a number too!

isFinite(parseFloat(value))

http://www.webveteran.com/blog/index.cfm/2007/2/19/JavaScript-Round-to-any-multiple-of-a-specific-number

Thanks from this link:

http://blackbeltcoder.net/2007/04/20/javascript-and-css-compression-in-msbuild/

for (var member in object) {
alert(’Name: ‘ + member);
alert(’Value: ‘ + object[member]);
}

This is yet anther IE bug I have found whilst doing a lot of AJAX stuff with prototype recently. If you make and AJAX request such as AJAX.Update(blah blah and you set evalScripts: true then IE7 will throw a wobbly (great).

Basically if the JS has comments around it then IE blows up. I found this a useful link:

When using Ajax.Updater with the option evalScripts:true like:

  new Ajax.Updater( table_id+'tbody', '/someurl', {
    parameters : { 'table_id':table_id },
    evalScripts : true
  });

and response of /someurl contains the following script:

<script language="JavaScript" type="text/javascript">
<!--
alert( 'Hello' );
// -->
</script>

IE7 throws an error “Syntax error” in line 212 of prototype.js version 1.5.0 in function evalScripts.

If you try a non-commented script like:

<script language="JavaScript" type="text/javascript">
alert( 'Hello' );
</script>

it works. Firefox works whether the script is commented or not.

I am currently using JSF and Facelets for my web app that adds the comments around the JS for you - PAIN IN &^%$£

Not got a solution yet for JSF!

UPDATE!!

We tried to change myFaces so that it did not render the comments but thought that it was a bad idea and back tracked!

So the fix had to be in the JavaScript. We added the following to the Prototype class:

exec: function(code) {
  if ((code += '').blank()) return;
  var script;

  if (document.body) {
    script = new Element('script', { type:'text/javascript' });
    try {
      script.appendChild(document.createTextNode(code));
    } catch (e) { script.text = code; }
    ($$('head').first() || $(document.documentElement)).insert(script);
  }
  else {
    var scriptId = '__prototype_exec_script';
    document.write('<script id="'+ scriptId +'" type="text/javascript">'+ code +'<\/script>');
    script = $(scriptId);
  }
  script.remove();
  script.text = '';

},

And then changed where it evals the scripts to use this method instead. This does mean we cannot easily just upgrade the version of prototype we are using but to be honest I would rather it worked in the first place!

This is fine if you just let .NET generate your client side script - but what if I want to write my own? What options do I have?

1. Alter all your ID’s in your script as they will always be mangled the same! - I would rather not thanks..
2. Change the ID’s in your script at runtime - not great but better
3. Got any better ideas?

VB I know but you still get the idea:

Dim script As String = “[Label1ID].innerHTML = ‘boo!’;”
Dim scriptKey As String = “SayBoo”
Dim addScriptTags As Boolean = True

Protected Sub Page_Load(ByVal sender As Object, _
ByVal e As EventArgs)

script = script.Replace(“[Label1ID]“, Label1.ClientID)

ClientScript.RegisterStartupScript( _
Me.GetType(), scriptKey, script, addScriptTags _
)

End Sub

Thanks to: http://www.odetocode.com/articles/450.aspx

The Firefox plugin JavaScipt plugin by Venkman; yet another tool to learn - this was useful:

http://svendtofte.com/code/learning_venkman/venkmanwindows.php

Interesting thing Thom brought up today. Two way communication from with the browser in flash - control flash from javascript.

This seemed to give the answers:

http://www.moock.org/webdesign/flash/fscommand/index.html

JavaScript can send commands to Flash by invoking built-in methods on embedded movie objects. Calling Flash methods works exactly like all calls to built-in methods on JavaScript objects (eg. document.write() or window.close()). From a developer point of view, this direction of communication is one sided–JavaScript methods control a Flash movie entirely in JavaScript, without requiring complementary code in the Flash movie.