通过ID动态选择

Question

I have the ID of a selected textarea stored in a variable. Is it possible to use that variable to select the element by ID later on in the code? For example:

var currentTextarea = null;

function foo() {
    currentTextarea = 'pageid'; // This will be set dynamically via an event. Example only.
}

function bar() {
    $('#' + currentTextarea).val(); // Although this don't seem to work
}

Answer 1

是的，您的代码应该可以工作-确保在bar（）之前调用foo（），否则为空值...

Answer 2

Yes, you can do that; I've done that before with no problems. Make sure currentTextarea is defined before it runs... or make sure nothing else is changing the value (since it's a global variable).

Answer 3

它适用于http://jsfiddle.net/6hHkC/