How to address form controls in jsp page

Hello,
I have a very stupid question. How do i empty the textfield value in my jsp page. I know that i can make a function that does that. but i dont know how to adress the control. Its got to be something like txtfield.setValue("myvalue") but i just dont know
i cant find anything either on the internet. can somebody help me plz?
thx very much,
Kim

Hi Kim,
You can use the following JavaScript command:
document.nameField.value = theValue;
You can use this on submit of the form or in a click event at the field.
I hope it be useful

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How come the form in the JSP page does not work if user hits "ENTER"

When I use the following code for loginpage.jsp
If the user hits ENTER on the keyboard it just displays the same form with nothing in the username box.
It works if the user clicks the button.
<HTML>
<BODY>
<%
String submit = request.getParameter("submit");
if(submit == null){
%>
<FORM METHOD=POST ACTION=loginpage.jsp>
Please enter your username: <INPUT TYPE=TEXT NAME=username SIZE=20>
<INPUT TYPE=SUBMIT NAME=submit VALUE='Go!'>
</FORM>
<%
else {
String user = request.getParameter("username");
if(user == null) {
// display same page
} else {
// foward to next page
%>
</BODY>
</HTML>

I adjusted my code but it still does nto work when hitting the ENTER keyboard button.
<HTML>
<BODY onload="document.form1.left.focus();">
<%
String submit = request.getParameter("submit");
if(submit == null){
%>
<FORM METHOD=POST ACTION=loginpage.jsp>
Please enter your username: <INPUT TYPE=TEXT NAME=username SIZE=20>
<INPUT TYPE="button" name="left" value="LEFT" onlick="alert(this.name)">
<INPUT TYPE="button" NAME="right" VALUE="RIGHT" onclick="alert(this.name)">
</FORM>
<%
else {
String user = request.getParameter("username");
if(user == null) {
// display same page
} else {
// foward to next page
%>
</BODY>
</HTML>
If I do this
<FORM METHOD=POST ACTION=nextpage.jsp>
And use ENTER keyboard button it works, but not when I have ACTION to teh same page.
Why is that?
Is this JSP related or HTML? I thought JSP had something to do with it since it's JSP file.

Web Part Error: A Web Part or Web Form Control on this Page cannot be displayed or imported.

SharePoint 2007 custom (VS 2008) solution is upgraded to SharePoint 2013 using (VS 2012). I followed this approach.
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Error
Web Part Error: A Web Part or Web Form Control on this Page cannot be displayed or imported. The type could not be found or it is not registered as safe. Correlation ID: 5d217c9c-1827-7083-80cd-e095a30befee.
Show Error Details
Hide Error Details
[UnsafeControlException: A Web Part or Web Form Control on this Page cannot be displayed or imported. The type could not be found or it is not registered as safe.]
at Microsoft.SharePoint.ApplicationRuntime.SafeControls.GetTypeFromGuid(Boolean isAppWeb, Guid guid, Guid solutionId, Nullable`1 solutionWebId, String assemblyFullName, String typeFullName, Boolean throwIfNotSafe)
at Microsoft.SharePoint.WebPartPages.SPWebPartManager.CreateWebPartsFromRowSetData(Boolean onlyInitializeClosedWebParts)
<menu class="ms-hide" id="MSOMenu_WebPartMenu"><ie:menuitem id="MSOMenu_Minimize" text="Minimize" title="Collapse this web part." type="option"></ie:menuitem><ie:menuitem
id="MSOMenu_Restore" text="Restore" title="Expand this web part." type="option"></ie:menuitem><ie:menuitem id="MSOMenu_Close" text="Close" title="Close this Web Part. You can still
find it under closed Web Parts section in the insert ribbon. These changes will apply to all users." type="option"></ie:menuitem><ie:menuitem iconsrc="/_layouts/15/images/DelItem.gif" id="MSOMenu_Delete" text="Delete"
title="Delete this Web Part from the page. These changes will apply to all users." type="option"></ie:menuitem><ie:menuitem type="separator"></ie:menuitem><ie:menuitem iconsrc="/_layouts/15/images/EditItem.gif"
id="MSOMenu_Edit" text="Edit Web Part" title="Change properties of this shared Web Part. These changes will apply to all users." type="option"></ie:menuitem><ie:menuitem id="MSOMenu_Connections"
text="Connections" title="Show connections options for this Web Part. These changes will apply to all users." type="option"></ie:menuitem><ie:menuitem type="separator"></ie:menuitem><ie:menuitem
id="MSOMenu_Export" text="Export..." title="Export this Web Part. These changes will apply to all users." type="option"></ie:menuitem><ie:menuitem iconsrc="/_layouts/15/images/HelpIcon.gif" id="MSOMenu_Help"
style="display:none;" text="Help" type="option"></ie:menuitem> </menu>

Hi Ashok,
According to your description, my understanding is that you got an error after you re-built a SharePoint 2007 solution with VS2012, and deployed it.
Make sure the Namespace and Type Name are consistent across all files where indicated. Also with matching case sensitivity. Verify web.config file and assembly in GAC or virtual directory bin folder in post deployment.
More information, please refer to the link below:
http://roykimsharepoint.wordpress.com/2013/04/27/classic-web-part-errors/
Here is a similar post for you to take a look at:
http://stackoverflow.com/questions/1689707/sharepoint-web-part-type-could-not-be-found-registered-as-safe
I hope this helps.
Thanks,
Wendy
Wendy Li
TechNet Community Support

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A webpart or web form control on this page cannot be displayed or imported.The type could not be found or it is not registered as safe.

Hi,
After moving my files from SP 2010 to SP 2013 , for all my web parts i am getting A webpart or web form control on this page cannot be displayed or imported.The type could not be found or it is not registered as safe. error. I checked web.config files
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Adit

Hi Adit,
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http://www.bluedoglimited.com/SharePointThoughts/Lists/Posts/Post.aspx?ID=189
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Victoria Xia
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How to address form controls in jsp page

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