Javascript 从多选选项框中获取值
这让我发疯。这一定是我所忽略的简单而愚蠢的事情。 我的表单中有一个多重选择框。我只是想获取所选的值。在我的循环中,如果我使用警报那么我就没有问题。一旦尝试连接这些值,我就会收到错误“SelBranch[...].selected”为空或不是对象
<form name="InventoryList" method="post" action="InventoryList.asp">
<select name="SelBranch" class="bnotes" size="5" multiple="multiple">
<option value="All">All</option>
<option value="001 Renton">001 Renton</option>
<option value="002 Spokane">002 Spokane</option>
<option value="003 Missoula">003 Missoula</option>
<option value="004 Chehalis">004 Chehalis</option>
<option value="005 Portland">005 Portland</option>
<option value="006 Anchorage">006 Anchorage</option>
<option value="018 PDC">018 PDC</option>
</select>
<input type="button" name="ViewReport" value="View" class="bnotes" onclick="GetInventory();">
</form>
<script language="JavaScript">
function GetInventory()
{
var InvForm = document.forms.InventoryList;
var SelBranchVal = "";
var x = 0;
for (x=0;x<=InvForm.SelBranch.length;x++)
{
if (InvForm.SelBranch[x].selected)
{
//alert(InvForm.SelBranch[x].value);
SelBranchVal = SelBranchVal + "," + InvForm.SelBranch[x].value;
}
}
alert(SelBranchVal);
}
</script>
This one is driving me nuts. It’s got to be something simple and stupid that I am overlooking.
I have a multiple select box in a form. I am just trying to get the values that are selected. In my loop, if I use alert then I have no problem. As soon as try to concatenate the values I get the error ‘SelBranch[...].selected' is null or not an object
<form name="InventoryList" method="post" action="InventoryList.asp">
<select name="SelBranch" class="bnotes" size="5" multiple="multiple">
<option value="All">All</option>
<option value="001 Renton">001 Renton</option>
<option value="002 Spokane">002 Spokane</option>
<option value="003 Missoula">003 Missoula</option>
<option value="004 Chehalis">004 Chehalis</option>
<option value="005 Portland">005 Portland</option>
<option value="006 Anchorage">006 Anchorage</option>
<option value="018 PDC">018 PDC</option>
</select>
<input type="button" name="ViewReport" value="View" class="bnotes" onclick="GetInventory();">
</form>
<script language="JavaScript">
function GetInventory()
{
var InvForm = document.forms.InventoryList;
var SelBranchVal = "";
var x = 0;
for (x=0;x<=InvForm.SelBranch.length;x++)
{
if (InvForm.SelBranch[x].selected)
{
//alert(InvForm.SelBranch[x].value);
SelBranchVal = SelBranchVal + "," + InvForm.SelBranch[x].value;
}
}
alert(SelBranchVal);
}
</script>
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评论(4)
for 循环额外运行了一次。更改
为
The for loop is getting one extra run. Change
to
我在这里发布答案仅供参考,可能会有用。
Here i am posting the answer just for reference which may become useful.
查看 HTMLSelectElement.selectedOptions。
HTML
JavaScript
这也适用于非
多个
警告:似乎支持此
selectedOptions
目前尚不清楚Take a look at HTMLSelectElement.selectedOptions.
HTML
JavaScript
This would also work on non-
multiple
<select>
elementsWarning: Support for this
selectedOptions
seems pretty unknown at this point另外,将其更改为:
原因
是第一次变量
SelBranchVal
将为空Also, change this:
to
The reason is that for the first time the variable
SelBranchVal
will be empty