asp dropdownlist dynamic value from javascript iss

2019-07-01 20:05发布

站内问答 / JavaScript
1905 3 5

I have a dropdownlist with 5 items. Value of last item is "other". By choosing "other" appears popup with input. The value of this input i set to this item by javascript. So value becoms inserted text. When i submitting the form, it doesn't work with this dynamic value, but other items of select works. Any ideas? Thanks very much!

3条回答
Bombasti
2楼-- · 2019-07-01 20:25

Here is a quick example of using Request.Params collection to read dynamically added value.

Here is the client side code.

<!-- Server Control - Drop Down List -->
<asp:DropDownList ID="ddList" runat="server">
    <asp:ListItem Text="A" Value="A"></asp:ListItem>
    <asp:ListItem Text="B" Value="B"></asp:ListItem>
    <asp:ListItem Text="C" Value="C"></asp:ListItem>
</asp:DropDownList>

<!-- Control to fire JS event to add a new item to the Drop Down List above -->
<input type="button" value="Add Item D" id="AddItem" />

<!-- jQuery event to add a new option to the list on the click (no postback) -->
$('#AddItem').click(function ()
{
    $('#<%= ddList.ClientID %>').append('<option value="D">D</option>');
});

Here is the server side code to read the value.

var ddlListSelectedValue = Request.Params["ddList"];
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够拽才男人
3楼-- · 2019-07-01 20:28

Just Update you Function

$('#AddItem').click(function ()
{
var dropdown= document.getElementById("<%= ddList.ClientID %>");
dropdown.options[dropdown.options.length] = new Option('YOUR TEXT', 'YOUR VALUE');
});

Cheers



I have tested it myself, it works. Following is a complete example:

<html>
<head>
<title>Test ddl Item Addition By IuR</title>
</head>
<body onload="add_dditem()">
<script type="text/javascript">
function add_dditem()
{
var dropdown= document.getElementById("ddList");
dropdown.options[dropdown.options.length] = new Option('YOUR TEXT', 'YOUR VALUE');
}
</script>

<select id="ddList">
</select>
</body>
</html>
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傲
4楼-- · 2019-07-01 20:34

Rather than set this value as droupdown list item value, you can use hiden field 

<input type="hidden" id="hiddenField" runat="server" />

set value using JavaScript as below 

document.getElementById ("hiddenField").value = "inputValue";

hiddenField value can access from code behind as below 

string inputValue = hiddenField.Value;
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