Return true in JavaScript when call function from OnClientClick

Question

When I use this code:

<asp:Button runat="server" ID="Block" Text="text"  OnClientClick="return BlockCheck()"   OnClick="BtnBlockClick"  CausesValidation="False"/>


function BlockCheck() {
            if (x) {
                document.getElementById('#ErrorText').text('Error');
                return false;
            }
        return true;
    }

but this for this part : document.getElementById('#ErrorText').text('Error');<br>to return true.

What is x? Where is is defined?

Jason Evans
– Jason Evans

2013-12-06 11:27:11 +00:00
Commented Dec 6, 2013 at 11:27 — Jason Evans
– Jason Evans, Commented Dec 6, 2013 at 11:27
x is condition that true

Ramin Asadi
– Ramin Asadi

2013-12-06 11:27:55 +00:00
Commented Dec 6, 2013 at 11:27 — Ramin Asadi
– Ramin Asadi, Commented Dec 6, 2013 at 11:27

raina77ow · Accepted Answer · 2013-12-06 13:02:26Z

2

First, you don't need # in getElementById's param: it really should be written like this...

document.getElementById('ErrorText')

With # that'll try to find an element with ID literally equal to '#ErrorText'- that'll fail, so the function will return null. And any attempt to work with null afterwards (calling some methods off it, in particular) will fail with an Error raised.

Second, you seem to mix jQuery functions and JavaScript ones: there's no text method in DOMElements. Strictly speaking, you'll have to check for textContent support, then go with it; if it's not supported, use innerText instead. For example:

var el = document.getElementById('ErrorText');
el['textContent' in el ? 'textContent' : 'innerText'] = 'Error';

Apparently the check's not required if your project doesn't have to support IE8-.

edited Dec 6, 2013 at 13:02

answered Dec 6, 2013 at 11:27

raina77ow

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