Dynamic Add method of HTML element

Today do dongdong time to use JS to create HTML elements and then dynamically add methods to the element, walked a lot of detours. Finally, the solution to release, so that everyone after less detours.

JS file

function Checknull (ID)

{

DoSomething

}

var checknewnull= function (ID)

{

return function () {

Checknull (ID);

}

}

Adding methods to HTML elements

Create a TEXTAREA

Std2area=document.createelement ("textarea");

Setting properties

Std2area.setattribute ("id", "member_task" +position);

Std2area.setattribute ("name", "Member_task" +position);

Add method

Std2area.attachevent ("onblur", Checknewnull ("Member_task" +position));

If the Add method is written as: Std2area.attachevent ("onblur", Checknull ("Member_task" +position));

or written std2area.attachevent ("onblur", checknull);

Then there will be an error. The reason for this is to assign the return value of Checknull ("Member_task" +position) to onblur

Instead of assigning the function checknull to the element. So the right thing to do is to return checknull with a function, as shown above.

Other ways to write the final Add method:

Std2area.onblur=checknull;

Std2area.setattribute ("onblur", checknull);