触发button_click事件后
protected void SearchButton_Click(object sender, EventArgs e)
{
if(TextBox1.Text.Trim().Length<=1)
{
Response.Write("<script>alert('关键字为空或太少。')</script>");
}
}
protected void SearchButton_Click(object sender, EventArgs e)
{
if(TextBox1.Text.Trim().Length<=1)
{
Response.Write("<script>alert('关键字为空或太少。')</script>");
}
}
//换成这样试试
ClientScript.RegisterStartupScript(this.Page.GetType(), "Alert", "alert('关键字为空或太少');", true);