dwr a ajax 提交,ajax – Does Java offer a timestamp??…..DWR – Stack Overflow

Im using DWR, which im fairly new to…I using ajax to submit a comment to the page and I got request to see If i can show a tmestamp when the comment is submitted:

In a nutshell—The bean has a variable called auditable…which doesnt get populated with a timestamp until it hits the database. Thats fine. My question…can I pass something to auditable on the fly with ajax that is a sort of “timestamp” to pass back to the page????

Thanx in advance!!!!

heres the code:

JSP

You have ${const[‘COMMENT_MAX_LENGTH’] – fn:length(commentForm.comment)} characters left.

οnkeypress=”characterCounter(‘commentsCounter’,${const[‘COMMENT_MAX_LENGTH’]}, this)”

οnkeydοwn=”characterCounter(‘commentsCounter’,${const[‘COMMENT_MAX_LENGTH’]}, this)”

οnkeyup=”characterCounter(‘commentsCounter’,${const[‘COMMENT_MAX_LENGTH’]}, this)”>

DWR JAVASCRIPT:

function addComment()

{

$(“#commentErrors”).css(“visibility”, “hidden”);

var obj = {comment:null};

WhatIfDataAction.addComment(dwr.util.getValues(obj),

{

callback:addCommentCallback,

timeout:60000,

exceptionHandler:function(msg, e)

{

alert(“Error submitting form. ” + msg);

}

}

);

}

function addCommentCallback( comment )

{

if (comment.messages.length > 0)

{

//Convert the error messages into an HTML string.

var html = “”;

for (var i = 0; i < comment.messages.length; i++)

{

html += “

” + comment.messages[i] + “”;

}

$(“#commentErrors”).html(html);

$(“#commentErrors”).css(“visibility”, “visible”);

}

else

{

// Build HTML for new row.

var html = “

” + comment.comment + “” +

“

” + comment.id + “” +

“

“; // three empty TDs for the three actuals fields

$(“#commentRow”).before(html);

WHATIFDATAACTION.JAVA:

public CommentForm addComment(Map properties) throws Exception

{

CommentForm form = new CommentForm(properties);

if (form.validate(this))

{

CommentBean bean = form.toBean();

EntryBean entry = WhatifCache.fetchEntryFromCache(getSession());

entry.addComment(bean);

form.setId(bean.getId());

bean = form.toBean();

}

return form;

}

And finally…commentBean:

public final class CommentBean

extends AbstractBean

implements Auditable,

BeanCache.CacheableBean

{

private long id;

private long entryId;

private String comment;

private AuditableBean auditable;

/** Description character max length, matches size of description field in db **/

public static final Integer COMMENT_MAX_LENGTH = 250;

public CommentBean()

{

}

@Override

public void readExternal(ObjectInput in) throws IOException, ClassNotFoundException

{

id = in.readLong();

entryId = in.readLong();

comment = in.readUTF();

auditable = (AuditableBean)in.readObject();

}

@Override

public void writeExternal(ObjectOutput out) throws IOException

{

out.writeLong(id);

out.writeLong(entryId);

out.writeUTF((comment == null) ? “” : comment);

out.writeObject( auditable );

}

@Override

public void readSQL(SQLInput in, String typeName) throws SQLException

{

id = in.readLong();

entryId = in.readLong();

comment = in.readString();

auditable = (AuditableBean)in.readObject();

}

@Override

public void writeSQL(SQLOutput out) throws SQLException

{

out.writeLong(id);

out.writeLong(entryId);

out.writeString(comment);

out.writeObject( auditable );

}

public long getId()

{

return id;

}

public void setId(long id)

{

this.id = id;

}

public long getEntryId()

{

return entryId;

}

public void setEntryId(long entryId)

{

this.entryId = entryId;

}

public String getComment()

{

return comment;

}

public void setComment(String comment)

{

this.comment = comment;

}

public AuditableBean getAuditable()

{

return auditable;

}

public void setAuditable(AuditableBean bean)

{

auditable = bean;

}

public boolean isActive()

{

return true;

}

public String getKey()

{

return “”+id;

}