How can i check textbox null inside masterpage

[deepthy p m 0]

I am using asp.net with c#.In my project i am using master page .Each form are child of this master page.I want to check textbox null in clild master page using javascript. I use the following code to check null. butSubmit.Attributes.Add("OnClick", "return val()"); function val() { if(document.getElementById("TextBox1").value=="") { return; } } but its not working.If, without using the master page it work properly.In my child master page there is no form tag.Because in my master page i use teeview so form tag is placed in master page.If anyone understand my probelm pls .

[Sherin Iranimose]

Where the text box is? In Master page or content page(child page)?

deepthy.p.m wrote:

I want to check textbox null in clild master page using javascript.

How many master pages are there?

EVEN THE WORD IMPOSSIBLE SAYS I M POSSIBLE.

[deepthy p m 0]

content page

[Sherin Iranimose]

JS Function function val(cntrl) { if(document.getElementById(cntrl).value=="") { return false; } }

deepthy.p.m wrote:

butSubmit.Attributes.Add("OnClick", "return val()");

btnsubmit.Attributes.Add("onclick", "return val('" + TextBox1.ClientID + "')")

EVEN THE WORD IMPOSSIBLE SAYS I M POSSIBLE.

[deepthy p m 0]

thanks for replay