Javascript检查循环中的项目的所有按钮

Question

我无法制作一个可以选中所有复选框的按钮（可能还有另一个取消选中所有复选框的按钮。

所以我需要的是：一个可以检查所有框的函数和一行代码放入 html 中以调用该函数。

我的项目不在表格中。

这是我的 .js 文件（数组）中的代码

var computer = new Array();
{
computer[0] = "10001, Nvidia Geforce GTX 690, $1200"

computer[1] = "10002, Raedon HD 7950, $450"   

computer[2] = "20001, Ivy Bridge i7 3770, $400"

computer[3] = "20002, Ivy Bridge i7 3770k, $420"

computer[4] = "20003, Sandy Bridge i7 2700k, $340"

computer[5] = "20004, Bulldozer FX-8150, $270"

computer[6] = "30001, Antec eleven-hundred, $120"

computer[7] = "30002, Coolermaster HAF-X, $170"

computer[8] = "30003, Antec three-hundred, $50"

computer[9] = "30004, Corsair 550D, $160"

computer[10] = "40001, INTEL-ASrock fatal1ty Z77 Professional Motherboard, $250"

computer[11] = "40002, INTEL-ASrock Z77 extreme9 Motherboard, $350"

computer[12] = "40003, AMD-ASrock fatal1ty 990FX Professional Motherboard, $240"

computer[13] = "40004, AMD-ASUS Sabertooth 990FX Motherboard, $260"

}

这是我的 HTML 中的代码。

<script type="text/javascript">

for(x=0; x<=computer.length-1; x++) {

  document.write("<tr id='"+x+"'><td><label><input type='checkbox' id='labeltest' name='item' value='"+x+"'/> "+computer[x].split(",")[0]+"</label></td><td>"+computer[x].split(",")[1]+"</td><td> <input name='qty' id='qty' type='textbox' value='0' onchange='qtychange(document.myform.qty);'/> </td><td>"+computer[x].split(",")[2]+"</td></tr>");

}

提前致谢:)

Answer 1

你的复选框必须只有相同的“name”属性，而不是“id”，然后使用这个函数：

function check() {

    var checkboxes = document.getElementsByName('item');

    for (var i = 0, length = checkboxes.length; i < length; i++) {
        checkboxes[i].checked = true;
    }
}

HTML：

<button onclick="check()">Check them all!</button>