__doPostBack不会在首次点击时触发

Question

Just like the title says. I have some javascript on a page that is supposed to fire a __doPostBack call if other variables/conditions on the form are valid.

function DoPostBack() { 
    var valid = true;
    if (SomethingHappens) { 
        valid = false 
    }

    alert("Is_Valid? " + valid) //evaluates to  true
    if (valid) { 
       __doPostBack("btnSubmit",''); //First click here does nothing, despite it being it by code. Works fine the second time. 
    }

And that is hooked up to a button as follows:

<input ID="btnSubmit" runat="server" onclick="DoPostBack();" type="button" value="Submit"  style="width:80px"/>

What is causing the first click of the submit button to be ignored? I have confirmed that this is the behavior I am seeing by placing a breakpoint in my page_load event. The first time __doPostBack is called, the breakpoint is not hit, the second time, it is hit.

Answer 1

如果您说的是正确的，则应该执行您的函数，因为事实并非如此，那么至少您所说的内容是不正确的。