Question

problem with javascript and master pages

Asked by: andieje

Hi

I have some code like this in my javascript

  document.getElementById('<%=Label1.ClientID%>').style.backgroundColor = 'red';

This works fine when i have the javascript in a standard webform as I can put the javascript in the head tags of the page and the javascript is 'interpreted' and the id of the contol is replaced.

How would i do the equivalent thing in a master page? If i just include the javascript file in the master page using clientscriptinclude methods the id of the control is not worked out and filled in.

thanks in advance

andrea

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Asked On
2007-08-29 at 04:57:46ID22794018
Tags

clientscriptinclude

,

master

Topic

Programming for ASP.NET

Participating Experts
1
Points
500
Comments
4

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Answers

 

by: strickddPosted on 2007-08-29 at 05:06:30ID: 19790364

Things get pretty hairy if you want to do things this way... You have several options:

1) Writing the javascript dynamically in the masterpage in the Page_PreRender (or earlier) by looping through all the controls in the content portion and getting their client ID's.

2) Creating an Array variable in javascript that will contain the controls ClientID's on the page. Putting this at the top of the HTML section, then having each content page populate this variable with its control client id's.

3) Do it on each page instead of the Masterpage.

 

by: andiejePosted on 2007-08-29 at 13:24:24ID: 19795096

hi strickdd

i probably didnt word my question right. I only want to output this code on one page but this page is a content page based on a master page instead of a normal webform. Therefore, i dont have head tags at the top. I understand one way to solve my problem would be to write the javascript dynamically in the code behind getting the client IDs and using something like RegisterStartupScrtip or whatever the method is called.

I dont understand your options 2 and 3 but i would use option 1 anyway probably. I was looking for an easier way thats all

 

by: strickddPosted on 2007-08-29 at 13:27:20ID: 19795130

It is a common misconception that a <script> must be in the <head>. You can actually put it just about anywhere on the page. In fact sometimes you HAVE to put it at the bottom of a page.

 

by: andiejePosted on 2007-08-29 at 15:53:41ID: 19796071

Oh right, so i could include it in script tags anywhere within the content page and this code

  document.getElementById('<%=Label1.ClientID%>').style.backgroundColor = 'red';

will display the propery javascript id when the content page loads?

andrea

20120131-EE-VQP-002

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