从 Javascript 函数返回值设置 HTML 文本框值

Question

I've two separate HTML file and .js file. I have a calculate method which return the result in the Javascript file.

My question is how to set a textbox value from a Javascript return value. Or at least from a separate Javascript file. Initially I tried below which doesn't work as Javascript and html are separated.

function Calculate(ch) 
{
    //...
    document.getElementById('Input').value = resultValue;
}

Answer 1

eval is the soution for my problem. Input.value = eval(Calculate(ch))

Answer 2

try to define the js-file in the bottom of your html-file (near the </body>). if you defined it above the targeted element its unknown. this may help.

felix

Answer 3

Access textarea contents using the innerHTML property, not the value property.

function Calculate(ch)  {
    //...
    document.getElementById('Input').innerHTML = resultValue;
}