EXT implementation of the scroll bar is always at the bottom of the method

In our actual development application, often use to ext the commonly used control textarea. For some form form, input information of the notes, introduction and so on when more information will be used textarea. Recently in a full network topology map, as well as network Diagnostics Ping,telnet connectivity testing and so on, there are some more difficult problems. It is through the AJAX request background data, the new data dynamically displayed in the textarea, the textarea scroll bar will not be positioned to the bottom. Always appear in the top position. After the study found that ext to its own TEXTAREA encapsulation, using the table layout. The control object we get from the getcmp () method is actually a table, which we fail to set its scrolltop on the table and get its ScrollHeight property. And what we really need is the textarea itself, not its parent component table.

Here I have my realization method to share to each netizen, make everybody take some detours less.

<pre name= "Code" class= "JavaScript" >xtype: ' Container ',
region: ' Center ', layout
: ' Fit ',
items:[{
	Margin: ' 0 0 ',
	xtype     : ' textarea ',
	grow      : True,
	ID      : ' textarea_id ',
	fieldlabel: ',
	readonly:true,
	autoscroll:true
}

Solution 1:

var textarea=ext.getcmp (' textarea_id ');
Textarea.bodyel.dom.childnodes[0].scrolltop=textarea.bodyel.dom.childnodes[0].scrollheight;

Solution 2:

document.getElementById (' Textarea_id-inputel '). scrolltop = document.getElementById (' Textarea_id-inputel '). ScrollHeight;

After testing, both scenarios can be used.
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