asp.net textarea换行并防止返回键回发

Question

I have an ASP.net web application with numerous pages. Most of them have Multiline APS.net textbox and standard text box. Pressing the return key has unexpected result depending on browsers, page, last control used. It can fire any control either the master or the child page. Sometimes hitting the return key even fire the logout control.

So to prevent this I added:

body onkeydown="return (event.keyCode!=13)"

In the the master page body tag as recommended in many places, which works like a charm. However, this cause the the return key not to respond to line feed in text area. Users need to be able to insert line feed in Text area ( TextBoxMode.MultiLine)

How can I prevent this behavior?

Answer 1

You can use this

window.onload = function() {
    setEvent("text", onKeyDown);
}

function onKeyDown()
{
   return (event.keyCode!=13)
}

Which will cancel return button in only textboxes

Answer 2

Found a solution: Keep:

body onkeydown="return (event.keyCode!=13)"

this will disable any post back using Return Key, Then add to any multi line textbox the following attribute:

TextBox1.Attributes.Add("onkeyup", "EnterEvent(event,this)");

with the following javascript:

// add Line feed in text area.
function EnterEvent(e,ctl) {
    var keycode = (e.keyCode ? e.keyCode : e.which);
    if (keycode == 13) {

    var st1 = $(ctl).textrange('get', 'start');
    var l = ctl.value.length;
    if (st1 < l) {
        $(ctl).textrange('replace', '\n');
        $(ctl).textrange('set', st1 + 1, 0);
    }
    else {
        ctl.value = ctl.value + '\n';
    }
    }

}

this "manually" insert LF on return key up event.