How  can  I use Javascript code to affect the display of textField?

Hi All,
I created a web application using JSF.
And Placed two controls: one Text Field and one Label.
On the Javascript onclick event of Label, I wrote the following javascript:
document.getElementById("form1:textField1").value="test123";
I run the web application, and click on the label, However, the text of the Text Field does not change.
But the following code shows text of the Text Field has been changed. it works.
alert(ocument.getElementById("form1:textField1").value);
So, why the display of the Text Field does not change? How to update the display of the Text Field?
Any suggestion will be helpful!
Thank you.

here is a full and correct example, enjoy
1. <html>
2. <%@ taglib uri="http://java.sun.com/jsf/core" prefix="f" %>
3. <%@ taglib uri="http://java.sun.com/jsf/html" prefix="h" %>
4. <f:view>
5. <head>
6. <title>
7. <h:outputText value="#{msgs.windowTitle}"/>
8. </title>
9. </head>
10. <body>
11. <h:form id="registerForm">
12. <table>
13. <tr>
14. <td>
15. <h:outputText value="#{msgs.namePrompt}"/>
16. </td>
17. <td>
18. <h:inputText/>
19. </td>
20. </tr>
21. <tr>
22. <td>
23. <h:outputText value="#{msgs.passwordPrompt}"/>
24. </td>
25. <td>
26. <h:inputSecret id="password"/>
27. </td>
28. </tr>
29. <tr>
30. <td>
31. <h:outputText value="#{msgs.confirmPasswordPrompt}"/>
32. </td>
33. <td>
34. <h:inputSecret id="passwordConfirm"/>
35. </td>
36. </tr>
37. </table>
38. <h:commandButton type="button" value="Submit Form"
39. onclick="checkPassword(this.form)"/>
40. </h:form>
41. </body>
42. <script type="text/javascript">
43. <!--
44. function checkPassword(form) {
45. var password = form["registerForm:password"].value;
46. var passwordConfirm = form["registerForm:passwordConfirm"].value;
47.
48. if(password == passwordConfirm)
49. form.submit();
50. else
51. alert("Password and password confirm fields don't match");
52. }
53. -->
54. </script>
55. </f:view>
56. </html>

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