发送3状态复选框的值 [英] Sending Values of 3 State Checkbox
问题描述
我开发了一个3状态复选框,该复选框允许我发送3个不同的值.这是我为复选框设置的值.
I have developed a 3 state checkbox that allows me to send 3 different values. Here are the values that I have set for a checkbox.
State 0 [] = Uncheck (Value = 0)
State 1 [x] = Checked (Value = 1)
State 2 [-] = Indeterminate (Value = 2)
现在问题出在通过POST方法发送值时.由于未选中取消选中"和不确定",因此不会发送值,并且在状态0或状态2的数据库上我都将获得值0.
Now the problem lays when sending the values via POST method. Since Uncheck and Indeterminate are unselected, the values don't get sent and I get a value of 0 on the database on both state 0 or state 2.
这是复选框的逻辑脚本:
This is the logic script for the checkboxes:
<script>
window.onload = function ()
{
setCheckBoxes(document.getElementById('LEVL1LES1'));
}
function setCheckBoxes(cb) {
if (cb.value == 0)
{
cb.checked = false;
}
else if (cb.value == 1)
{
cb.checked = true;
}
else
{
cb.indeterminate=true;
}
}
function changeBoxValues(cb) {
if (cb.value == 0)
{
cb.value = 1;
setCheckBoxes(cb);
}
else if (cb.value == 1)
{
cb.value = 2;
setCheckBoxes(cb);
}
else
{
cb.value = 0;
setCheckBoxes(cb);
}
}
和HTML:
<input type="checkbox" name="LEVL1LES1" value='<?php echo $row["LEVL1LES1"]?>' id="LEVL1LES1" onclick="changeBoxValues(this)">
由于我知道我正在尝试解决默认行为(复选框),因此任何人都可以提供有关如何解决此问题的任何意见吗?
Can anyone give me any input on how to fix this problem since I know that I am trying to make a workaround the default behavior oh checkboxes?
PS.您可能会问为什么我不使用下拉菜单之类的其他选项?这是原因:
PS. You may ask why I don't use other options like dropdown? Here is why:
谢谢!
推荐答案
如果您以经典形式执行此操作,并且始终希望接收一个值,那么一种相当标准的方法是根本不发送复选框的值.而是在隐藏的表单字段中包含您要发送的值.
If you're doing this in a classic form and always want to receive a value, a fairly standard approach is not to send the checkbox's value at all; instead, have a hidden form field with the value you want to send.
<input type="checkbox" id="LEVL1LES1" onclick="changeBoxValues(this)">
<input type="hidden" name="LEVL1LES1" value='<?php echo $row["LEVL1LES1"]?>'>
请注意,该复选框没有 name
,因此提交时不会包含在表单中.还要注意, hidden
字段具有与复选框的 id
相匹配的 name
.我在下面的 changeBoxValues
中使用它来关联两个字段,但这只是实现此目的的一种方法.另一个将是 data-*
属性,甚至只是 cb.nextElementSibling
,并确保隐藏字段始终是复选框元素之后的下一个元素.
Notice that the checkbox has no name
, and so will not be included in the form when submitted. Also note that the hidden
field has a name
which matches the id
of the checkbox. I use that in changeBoxValues
below to relate the two fields, but it's just one way to do it; another would be a data-*
attribute or even just cb.nextElementSibling
and ensuring that the hidden field is always the next element after the checkbox element.
然后在 changeBoxValues
中输入:
function changeBoxValues(cb) {
var hidden = document.querySelector('[name="' + cb.id + '"]');
if (hidden.value == 0)
{
hidden.value = 1;
}
else if (hidden.value == 1)
{
hidden.value = 2;
}
else
{
counter = 0; // ?? Where did counter come from??
hidden.value = counter;
}
setCheckBoxes(cb, hidden.value);
}
...和 setCheckBoxes
使用传入的值而不是 cb.value
来确定要设置的状态:
...and setCheckBoxes
uses the value passed in rather than cb.value
to determine which state to set:
function setCheckBoxes(cb, value) {
if (value == 0)
{
cb.checked = false;
}
else if (value == 1)
{
cb.checked = true;
}
else
{
cb.indeterminate=true;
}
}
值得注意的是,您的原始方法和上述方法都依赖JavaScript,因此您需要要求在页面上启用JavaScript.
It's worth noting that both your original approach and the above rely on JavaScript, so you'll need to require that JavaScript be enabled on the page.
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