将占位符文本添加到文本框 [英] Adding placeholder text to textbox

问题描述

我正在寻找一种将占位符文本添加到文本框的方法，就像使用 html5 中的文本框一样.

I am looking for a way to add placeholder text to a textbox like you can with a textbox in html5.

即如果文本框没有文本，则添加文本Enter some text here，当用户点击它时，占位符文本消失并允许用户输入自己的文本，如果文本框失去焦点并且仍然没有文本然后占位符被添加回文本框.

I.e. if the textbox has no text, then it adds the text Enter some text here, when the user clicks on it the placeholder text disappears and allows the user to enter their own text, and if the textbox loses focus and there is still no text then the placeholder is added back to the textbox.

推荐答案

不就是这样吗:

Textbox myTxtbx = new Textbox();
myTxtbx.Text = "Enter text here...";

myTxtbx.GotFocus += GotFocus.EventHandle(RemoveText);
myTxtbx.LostFocus += LostFocus.EventHandle(AddText);

public void RemoveText(object sender, EventArgs e)
{
    if (myTxtbx.Text == "Enter text here...") 
    {
     myTxtbx.Text = "";
    }
}

public void AddText(object sender, EventArgs e)
{
    if (string.IsNullOrWhiteSpace(myTxtbx.Text))
        myTxtbx.Text = "Enter text here...";
}

那只是伪代码，但概念就在那里.

Thats just pseudocode but the concept is there.

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