Post the checkboxes that are unchecked

I've got a load of checkboxes that are by default checked. My users will probably uncheck a few of the checkboxes (if any) and leave the rest of them checked. Is there any way to get the checkboxes that are NOT checked in a form post, rather than the ones that are checked?

---

Add a hidden input for the checkbox with a different ID:

<input id='testName' type='checkbox' value='Yes' name='testName'>
<input id='testNameHidden' type='hidden' value='No' name='testName'>

Before submitting the form, disable the hidden input based on the checked condition:

if(document.getElementById("testName").checked) {
    document.getElementById('testNameHidden').disabled = true;
}

---

The solution I liked the most so far is to put a hidden input with the same name as the checkbox that might not be checked. I think it works so that if the checkbox isn't checked, the hidden input is still successful and sent to the server but if the checkbox is checked it will override the hidden input before it. This way you don't have to keep track of which values in the posted data were expected to come from checkboxes.

<form>
  <input type='hidden' value='0' name='selfdestruct'>
  <input type='checkbox' value='1' name='selfdestruct'>
</form>

---

I solved it by using simple (native) javascript:

<input type="hidden" name="checkboxName" value="0"><input type="checkbox" onclick="this.previousSibling.value=1-this.previousSibling.value">

Be careful not to have any spaces or linebreaks between this two input elements!

You can use this.previousSibling.previousSibling to get "upper" elements.

With PHP you can check the named hidden field for 0 (not set) or 1 (set).

链接地址: http://www.djcxy.com/p/17576.html

上一篇: 我应该如何将字典编码到HTTP GET查询字符串中？

下一篇: 发布未选中的复选框