asp.net - Controls in ContentPlaceHolder are not recognized by javascript document.getelementsbyname -

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i have calender script in project. using it, have added image , on onclick event call javascript function displaydatepicker:

<img alt="calender" src="calender.jpg" onclick="displaydatepicker('txtbox1', this);"/>

i use masterpage in project , if image , associated textbox control in contentplaceholder, javasript library's function document.getelementsbyname returns null , seems can not detect controls inside contentplaceholder.

i used code page not using masterpage , went well.

i appreciate in advance.

good luck.

your asp textbox may render like: 

<input name="ctl00$featuredcontent$txtbox1" id="featuredcontent_txtbox1" type="text"/>

so, in javascript, should use clientid:

<img alt="calender" src="calender.jpg" onclick="displaydatepicker('<%= txtbox1.clientid %>', this);"/>

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