将Javascript值添加到隐藏输入

Question

我正在尝试将JavaScript变量添加到隐藏的输入字段。我该怎么做？

HTML：

<button type="button" class="submitFormOnClick btn btn-warning pull-right"
        style="margin-bottom:15px; margin-top:15px;" id="bet">Bet
</button>

<input type="hidden" name="controller" value="keno">
<input type="hidden" name="task" id="task" value="">
<input type="hidden" name="pickednumbers" id="pickednumbers">

JavaScript的：

<script type="text/javascript">
    var inc = 0;
    var pickednumbers = [];
    function myFunction(elmnt, color, id)
    {
        if(pickednumbers.length >= 20)
        {
            return false;
        }

        if (pickednumbers.indexOf(id) === -1)
        {
            pickednumbers.push(id);

            elmnt.style.background = color;
            inc = inc + 1;
            if(inc >= 20)
            {
                document.getElementById('onColor').setAttribute("style", "background-color:green");
            }
        }
        else
        {
            return false;
        }
    }
</script>

我需要的：我想要的是将变量pickednumbers与隐藏的输入类型一起发送。

Answer 1

你可以这样做：

var inc = 0;
var pickednumbers = [2,3,4,8];

document.getElementById("pickednumbers").setAttribute("value",JSON.stringify(pickednumbers));

<button type="button" class="submitFormOnClick btn btn-warning pull-right" style="margin-bottom:15px;margin-top:15px;" id="bet">Bet
</button>

<input type="hidden" name="controller" value="keno">
<input type="hidden" name="task" id="task" value="">
<input type="hidden" name="pickednumbers" id="pickednumbers">