[英]Why is my button's click event not firing?
我的Sharepoint 2010网页上有两个按钮。 一个触发(服务器端),另一个不触发*。 它们的设置类似。 这是会触发的:
Button btnSave = new Button();
btnSave.Text = "Save";
btnSave.Click += new EventHandler(btnSave_Click);
this.Controls.Add(btnSave);
. . .
private void btnSave_Click(object sender, EventArgs e)
{
LiteralControl message = null; // this breakpoint is hit, sho' nuff
. . . // code elided for brevity
}
...这是未被调用的:
Button btnGeneratePDF = null;
. . .
btnGeneratePDF = new Button();
btnGeneratePDF.Text = "Generate PDF";
btnGeneratePDF.UseSubmitBehavior = true; // trying this after it didn't work without it... (still doesn't work)
btnGeneratePDF.Click += new EventHandler(btnGenPDF_Click);
this.Controls.Add(btnGeneratePDF);
private void btnGenPDF_Click(object sender, EventArgs e)
{
GeneratePDF(listOfListItems); // breakpoint here never reached
}
为什么单击btnSave的处理程序时会调用,而btnGeneratePDF的处理程序却未调用?
我要在另一个Button的单击处理程序内创建pdfgen按钮的事实与此有关吗? 这是其中的重要部分:
private void btnSave_Click(object sender, EventArgs e)
{
try
{
. . . relatively insignificant code elided for brevity
Button btnGeneratePDF = new Button();
btnGeneratePDF.Text = "Generate PDF";
btnGeneratePDF.UseSubmitBehavior = true; // trying this after it didn't
work without it...still doesn't work; don't know why - configuration of this
button is the same as for btnSave
btnGeneratePDF.Click += new EventHandler(btnGenPDF_Click);
this.Controls.Add(btnGeneratePDF);
. . . relatively insignificant code elided for brevity
?
只有第一个(btnSave)按钮(而不是相同创建的btnGeneratePDF按钮)被标记为type =“ submit”:
<input type="submit" name="ctl00$ctl24$g_5f3fedca_19f7_4bc3_b84e_efbef0c48a33$ctl00$ctl152" value="Save" onclick="javascript:WebForm_DoPostBackWithOptions(new WebForm_PostBackOptions("ctl00$ctl24$g_5f3fedca_19f7_4bc3_b84e_efbef0c48a33$ctl00$ctl152", "", true, "", "", false, false))" />
我相信只有一个类型为Submit的按钮是允许的,但是在完成btnSave时,我尝试将其Enabled属性设置为false,以免btnSave出现问题,但这无济于事。
如果在“保存”按钮的单击事件内部分配了“ pdf”按钮的单击事件处理程序,则意味着将动态创建PDF按钮,并在每次单击保存按钮时分配其单击事件。 仅在那时pdf才会分配其事件。
您必须在页面处理中重新创建动态控件。 这是一个如何做的例子:
protected void Page_Load(object sender, EventArgs e)
{
Button b = new Button();
b.ID = "one";
b.Text = "one";
b.Click += B_Click;
this.form1.Controls.Add(b);
// this is where the dynamic control is created if id is in postback
if (Request["two"] != null)
{
Button x = new Button();
x.ID = "two";
x.Text = "two";
x.Click += X_Click;
this.form1.Controls.Add(x);
}
}
private void B_Click(object sender, EventArgs e)
{
Button x = new Button();
x.ID = "two";
x.Text = "two";
x.Click += X_Click;
this.form1.Controls.Add(x);
LabelOutput.Text += " ...one";
}
private void X_Click(object sender, EventArgs e)
{
LabelOutput.Text += " ...two";
}
这就是我的工作方式:
0)在顶部声明按钮:
Button btnGeneratePDF = null;
1)在Page_Load()事件中创建并配置它(如Michael Palermo所建议)
btnGeneratePDF = new Button();
btnGeneratePDF.Text = "Generate PDF";
btnGeneratePDF.UseSubmitBehavior = true; // I don't know if this is necessary
btnGeneratePDF.Click += new EventHandler(btnGenPDF_Click);
btnGeneratePDF.Visible = false;
this.Controls.Add(btnGeneratePDF);
请注意,首先将visible设置为false
2)使“生成PDF”按钮在“ btnSave”点击处理程序中可见:
btnGeneratePDF.Visible = true;
就是这样-现在工作正常。
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