如何使动态添加/删除控件的功能 [英] How to make function for dynamicly add/remove controls
问题描述
如何制作动态添加/删除控件的功能，如图像预览：
图像链接
我想在每个字段旁边放置一个按钮，添加新字段和按钮，如同我上面附上的图片预览？
我尝试过：
如何制作动态添加/删除控件的功能
How to make function for dynamicly add/remove controls, something like the image preview:
Link for the image
I want to put a button, add new field, and a buttons to remove next to every field as in the image preview which i attach above?
What I have tried:
How to make function for dynamicly add/remove controls
推荐答案
试试这个
try this
<!DOCTYPE html>
<html>
<head>
<title></title>
</head>
<body>
<ul id="ul1"> </ul>
<a href="#" onclick="add()" style="color:green;text-decoration:none">Add new</a>
<script>
function add() {
var li = document.createElement('li');
li.innerHTML = '<select><option>Select</option></select> <a href="#" onclick="remov(this)" style="color:red;text-decoration:none">×</a>'
document.getElementById('ul1').appendChild(li);
}
function remov(obj)
{
obj.parentElement.remove()
}
</script>
</body>
</html>
从未对此进行测试，但您可以尝试以下方法：
Never tested on this, but you could try something like this:
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
int occurence =1;
ViewState["Counter"] = occurence;
LoadUserControl();
}
}
protected void Button1_Click(object sender, EventArgs e)
{
if(ViewState["Counter"] != null){
int count = Convert.ToInt32(ViewState["Counter"]);
ViewState["Counter"] = count + 1;
LoadUserControl();
}
}
protected void LoadUserControl()
{
int count = Convert.ToInt32(ViewState["Counter"]);
if (count > 0)
{
for (int i = 0; i < count; i++)
{
WebUserControl uc = (WebUserControl)Page.LoadControl("WebUserControl.ascx");
webUC.ID = "webUC" + i.ToString();
//add the user control in the form
//note that you can also add them in a PlaceHolder or Panel control
form1.Controls.Add(uc);
}
}
}
请记住，上面的代码是只是一个简单的示例，因此在使用ViewState时要小心，以避免页面性能问题。此外，ViewState在尺寸方面有限制，因此请确保您不会在其中存储大量数据。
我还建议您使用阅读动态控件创建和页面循环事件。
HTH
Keep in mind that the code above is just a quick example, so be careful when using ViewState to avoid page performance issue. Also ViewState has a limit when it comes to size, so make sure that you don't store a huge amount of data in it.
I would also suggest you to read on Dynamic Controls creation and Page cycle events.
HTH
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