如何在选择控件中以编程方式选择适当的选项 [英] How can I select the appropriate option programmatically in select control

问题描述

var ch;

<select name="cmbStatus">
    <option value= 'I'>impossible</option>
    <option value= 'U'>unvisited</option>
    <option value= 'P'>priced</option>
    <option value= 'W'>in progress</option>
    <option value= 'R'>ready</option>                          
</select>

如何根据ch的值以编程方式选择适当的选项？ （例如，如果值为''W''在select控件中选择''正在进行''

How can I select the appropriate option programmatically based on the value of ch? (For example if value is ''W'' select ''in progress'' in the select control )

推荐答案

我不确定是否理解了你的问题，但如果您的目标是根据变量的值选择一个选项，这将实现您的期望：

I''m not sure about having understood your question, but if your goal is to select an option according with the value of a variable, this accomplishes your expectations:

<select name="cmbStatus">
    <option value= 'I' @(ch == "I" ? "selected = 'selected'" : "")>impossible</option>
    <option value= 'U' @(ch == "U" ? "selected = 'selected'" : "")>unvisited</option>
    <option value= 'P' @(ch == "P" ? "selected = 'selected'" : "")>priced</option>
    <option value= 'W' @(ch == "W" ? "selected = 'selected'" : "")>in progress</option>
    <option value= 'R' @(ch == "R" ? "selected = 'selected'" : "")>ready</option>
</select>

如何根据ch 的值以编程方式选择合适的选项

使用JavaScript可以设置如下：

How can I select the appropriate option programmatically based on the value of ch
Using JavaScript you can set like:

function setDropDownSeletedValue(selectedValue)
{
    var myCB=document.getElementById('myCB');
    myCB.value=selectedValue;
}

现在，直接从代码后面设置值或直接设置JS：

Now, set value from code behind or JS directly:

//Get value from DB
string valueFromDB = "W";//e.g value in DB is 'Second'
string script = string.Format("setDropDownSeletedValue('{0}')", valueFromDB);
ClientScript.RegisterStartupScript(this.GetType(), "KeyValue", script, true);

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