赋值给<input>里面<td>使用 Javascript

Question

I have an <input type="text" value="0.00" id="prdtotal"/> inside a <td> in a table.

I want to use Javascript to compute a value and assign it to the textbox. How can I do it?

I tried using document.getElementById("prdtotal").value="1.00"; but it doesnt work. Thanks for any help!

Answer 1

You've found the element using getElementById but you've not specified its the value property you want to set.

document.getElementById("prdtotal").value="1.00"

And a live example: http://jsfiddle.net/hevwt/

Answer 2

Use the value attribute:

document.getElementById("prdtotal").value = "1.00";

document.getElementById() returns the actual DOM object (a handle/reference to the <input> element).

Also note your missing double quote before the closing parenthesis.

I would suggest you to take a look at the Mozilla Developer Network (MDN):

• HTMLElement : a reference of all attributes a (general) HTML element can have.

• HTMLInputElement : a reference of all special attributes an input element (eg <textarea> , <input> ) can have.