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document.getElementById

Posted on 2011-09-18
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Last Modified: 2012-05-12
I am trying to get the reference to an HTML textbox using:
var tb1 = document.getElementById(id);
tb1.style.display = "none";

But, this does not seem to work.
Please let me know what I might be missing. Thanks!
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Question by:dshrenik
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13 Comments
 
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Expert Comment

by:Dave Baldwin
ID: 36557855
The name of the 'id' should be quoted.

var tb1 = document.getElementById("id");
tb1.style.display = "none";

http://www.w3schools.com/jsref/dom_obj_style.asp
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Author Comment

by:dshrenik
ID: 36557859
id is a variable that stores the actual ID
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LVL 82

Expert Comment

by:leakim971
ID: 36557867
wait the dom

window.onload = function() {
    var tb1 = document.getElementById("someid");
    tb1.style.display = "none";
}

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if you've asp.net use ClientID : http://beyondrelational.com/blogs/hima/archive/2010/07/16/all-about-client-id-mode-in-asp-net-4.aspx

var tb1 = document.getElementById("<%= Textbox1.ClientID %>");
tb1.style.display = "none";

http://msdn.microsoft.com/en-us/library/system.web.ui.control.clientid.aspx
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Author Comment

by:dshrenik
ID: 36557868
Using Firebug, this is the source for the HTML element:

<input id="id_1dropdown_0*p_0" class="parameterStyle" type="text" onchange="checkParameter1(this);" name="id_1dropdown_0*p_0" style="border-left: 1px solid grey; border-right: 1px solid grey; border-width: 1px; border-style: solid; border-color: grey;">

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Author Comment

by:dshrenik
ID: 36557872
I can't do this on "window.onload ". I need to do it after the page loads
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LVL 82

Accepted Solution

by:
leakim971 earned 500 total points
ID: 36557880
it work : http://jsfiddle.net/FvPK5/
function hide(id) {
    var tb1 = document.getElementById(id);
    tb1.style.display = "none";
}

Open in new window

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LVL 82

Expert Comment

by:Dave Baldwin
ID: 36557886
If you're trying to use 'id' as a variable name, I suggest you change it to something else because that has a specific meaning already.  While it is not a reserved word, I would use a variation of it like 'id1' or something that would not be confused with the HTML attribute 'id'.

Are you sure that 'id' contains a valid value?  Your syntax looks ok.  http://www.w3schools.com/jsref/prop_style_display.asp
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LVL 82

Expert Comment

by:Dave Baldwin
ID: 36557891
The asterisk is not a legal character in the id. id="id_1dropdown_0*p_0"  From W3C:

ID and NAME tokens must begin with a letter ([A-Za-z]) and may be followed by any number of letters, digits ([0-9]), hyphens ("-"), underscores ("_"), colons (":"), and periods (".").
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LVL 82

Expert Comment

by:leakim971
ID: 36557897
with a dropdown : http://jsfiddle.net/FvPK5/1/
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Author Comment

by:dshrenik
ID: 36557899
It is not a dropdown. It is a textbox (the id is misleading).
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Author Comment

by:dshrenik
ID: 36557944
I am able to retrieve the textbox with this line of code:
var tb1 = document.getElementById(id);

I can display its value by saying:
alert(tb1.value);

However, this is not working:
tb1.style.display = "none";
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LVL 82

Expert Comment

by:leakim971
ID: 36557951
try with an alert after :
tb1.style.display = "none";
alert("do you still see it really before clicking OK?");

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Author Comment

by:dshrenik
ID: 36557978
It was my mistake. It actually works. Thanks!
If possible, please answer this question:
http://www.experts-exchange.com/Programming/Languages/Scripting/JavaScript/Q_27314630.html
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