JavaScript

Some Javascript scripts that are always useful:

1) Disabling an item in a dropdown list:

function ValidateInactive(obj) {<br />var selectedCombobox = obj.options[obj.selectedIndex].text;<br />if (selectedCombobox.indexOf('*') >= 0) {<br /> obj.selectedIndex = 0;<br /> return false;<br /> }<br />}

2) Restriction in number of characters or lines in a multiline textbox
strScript = "function isMaxLength(txtBox) {"<br />strScript += " if(txtBox) { "<br />strScript += " var split = txtBox.value.split('\n'); "<br />strScript += " if (split.length > 5) { "<br />strScript += " return false;}"<br />strScript += " else {"<br />strScript += " return ( txtBox.value.length <= 499);" strScript += " }}" strScript += "}" <br />txtRemarks.Attributes.Add("onkeypress", "return isMaxLength(this);") txtRemarks.Attributes.Add("onkeyup", "return isMaxLength(this);") ClientScript.RegisterClientScriptBlock(Me.GetType(), "txtRemarks", strScript, True)


3) Blocking the right click / left click

function whichButton(event) { <br /> if (event.button == 2)//RIGHT CLICK <br /> { window.clipboardData.clearData();<br /> return false;<br /> }<br /> }

To call it:
onMouseDown="whichButton(event)"

4) Cleaning the clipboard:
window.clipboardData.clearData();