回发后将焦点设置在文本框上 [英] Set focus on textbox after postback

问题描述

我有一个包含 3 个文本框的搜索页面，用户可以使用这些文本框过滤搜索.

I have a search page with 3 TextBoxes that users can filter a search with.

我已将焦点放在包含文本的 TextBox 上.如果多个文本包含文本，则只关注最后一个 TextBox.

I have put the focus on the TextBox that contains text. If more than one contains text just focus on last TextBox.

private void SetFocusOnTextBox(ControlCollection ctrlCollection)
{
    foreach (Control ctrl in ctrlCollection)
    {
        if (ctrl.GetType() == typeof(TextBox))
        {
            if (((TextBox)ctrl).Text != string.Empty)
            {
                SetFocus(ctrl);
            }
        }
    }
}

在代码运行并且用户搜索之后，焦点会出现在 TextBox 的开头，而不是假定的结尾.如何将插入标记在该文本框的末尾?

After the code runs and a user searches, the focus comes to the beginning of the TextBox, not the end where it would be presumed. How to put insert marked at the end of that TextBox?

推荐答案

我想答案就在这里:使用 JavaScript 将光标置于文本输入元素中的文本末尾.

取自链接的解决方案:您必须将 onfocus="this.value = this.value" 添加到标记文件中的三个控件.这在 ASP.NET 中并不像应有的那么容易，但一种解决方案是在代码隐藏文件中添加属性.

Taken from the linked solution: You have to add onfocus="this.value = this.value" to the three controls in the markup file. This is not so easy in ASP.NET as it should be, but one solution is to add the attribute in the code behind file.

protected void Page_Init(object sender, EventArgs e)
{
    // MoveCursorToEndOnFocus is called in Page_Init and not Page_Load to avoid
    // filling the ViewState with unnecessary data.
    // TODO: Call MoveCursorToEndOnFocus here.
}

private void MoveCursorToEndOnFocus(ControlCollection controlCollection)
{
    foreach (TextBox textBox in controlCollection
        .Where(control => control.GetType() == typeof(TextBox)))
    {
        textBox.Attributes.Add("onchange", "this.value = this.value");
    }
}

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