为什么我的不提交(HtmlButton)仍然提交? [英] Why does my no-submit (HtmlButton) still submit?

问题描述

我想动态地创建行，这些行一直存在，但最初是隐藏的.

I want to dynamically make rows, which exist all along but are at first hidden, visible.

我尝试了客户端(jQuery)路由，但是遇到了问题.

I've tried the client-side (jQuery) route, but have had problems with that.

我宁愿走服务器端(C#)的道路，而且我认为我已经根据

I would prefer going down the server-side (C#) road, and I thought I had found the way to accomplish it based on this thread and this code:

HtmlButton btnAddFoapalRow = null;
. . .       
btnAddFoapalRow = new HtmlButton();
btnAddFoapalRow.Attributes["type"] = "button";
btnAddFoapalRow.InnerHtml = "+"; 
btnAddFoapalRow.ID = "btnAddFoapalRow";
btnAddFoapalRow.ServerClick += new EventHandler(btnAddFoapalRow_Click);
this.Controls.Add(btnAddFoapalRow);

private void btnAddFoapalRow_Click(object sender, EventArgs e)
{
    try
    {
        ShowNextFoapalRow();
    }
    catch (Exception ex)
    {
        String s = String.Format("Exception occurred: {0}", ex.Message); // TODO: Log this somewhere
    }
}

//// This only works the first time, because it causes the page to be reloaded, setting foapalRowsShowing back to 2
private void ShowNextFoapalRow()
{
    switch (foapalRowsShowing)
    {
        case 2:
            foapalrow3.Visible = true;
            foapalRowsShowing = 3;
            break;
        case 3:
            foapalrow4.Visible = true;
            foapalRowsShowing = 4;
            btnAddFoapalRow.Disabled = true;
            break;
    }
}


foapalrow3 = new HtmlTableRow();
foapalrow3.ID = "foapalrow3";
foapalrow3.Visible = false;
. . .
foapalrow3 = new HtmlTableRow();
foapalrow3.ID = "foapalrow3";
foapalrow3.Visible = false;

...但不行-第一次使第二行可见，但是随后的"+" HtmlButton混搭不会使第三行可见.然后逐步执行代码，我明白了为什么:每次我按下按钮时都会提交页面 ，因此初始代码再次运行，将可见的行数设置回两，并且总是第3行可见(从不显示第4行).

...but no go - the first time the second row is made visible, but a subsequent mashing of the "+" HtmlButton does not make the third row visible. And stepping through the code, I see why: the page is being submitted each time I mash the button, adn thus the initial code runs again, setting the number of rows visible back to two, and always making row3 visible (never row4).

这是将按钮捣碎后的样子，无论我将按钮捣碎多少次(应该再添加一行，但永远不会这样):

This is what it looks like after mashing the button, no matter how many times I mash the button (one more row should be added, but it never is):

行1，BTW，是列标题行；第2行是默认情况下可见的单行； row3和row4存在，但一开始不可见.

Row 1, BTW, is the column caption row; row 2 is the single row that is visible by default; row3 and row4 exist, but are not visible at first.

推荐答案

尝试使用 btnAddFoapalRow.Attributes.Add("onclick"，"return false;");

Try using btnAddFoapalRow.Attributes.Add("onclick", "return false;");

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