下一个按钮单击时如何显示消息？

Question

我创建了我的自定义页面，并想知道当我单击Next按钮时，如何检查我的输入是否为空。

流动情况如下：

1. 设置输入值
2. 单击“下一步”
3. 如果空显示“错误，空。设置所有输入”

我试过nsDialog onChange和onClick，但没能得到这个

Function lprConfigServerUserXml

nsDialogs::Create 1018

Pop $0

GetFunctionAddress $0 OnClick

nsDialogs::OnClick $0

${NSD_CreateLabel} 0 5u 75% 10u "* Server Address "

Pop $0

${NSD_CreateText} 0 15u 100% 12u ""

Pop $SERVER_ADDRESS

${NSD_OnChange} $SERVER_ADDRESS setSeverValue

${NSD_CreateLabel} 0 35u 75% 10u "* User Name "

Pop $0

${NSD_CreateText} 0 45u 100% 12u ""

Pop $USER_NAME

${NSD_OnChange} $USER_NAME setUserValue

${NSD_CreateLabel} 0 65u 75% 10 u "* <br/> Pop $0<br/> ${NSD_CreateText} 0 75u 100% 12 u ""<br/> Pop $PASSWORD<br/> ${NSD_OnChange} $PASSWORD setPasswordValue<br/> nsDialogs::Show<br/> FunctionEnd`‘

Function OnClick

Pop $0 # HWND

MessageBox MB_OK "Error, empty. Set all inputs"

FunctionEnd

至今仍无结果：

Answer 1

当用户单击“下一步”按钮时，将调用页面离开回调函数。您可以调用Abort，以防止用户移动到回调中的下一页。

!include nsDialogs.nsh
!include LogicLib.nsh

Page Custom MyCustomPageCreate MyCustomPageLeave
Page Directory
Page InstFiles

Var NameCtrl
Var NameString

Function MyCustomPageCreate
nsDialogs::Create 1018
Pop $0
${NSD_CreateLabel} 0 0 100% 12u "Name:"
Pop $0
${NSD_CreateText} 0 13u 100% 12u "$NameString"
Pop $NameCtrl
nsDialogs::Show
FunctionEnd

Function MyCustomPageLeave
${NSD_GetText} $NameCtrl $NameString
${If} $NameString == ""
    MessageBox MB_ICONSTOP "You must provide a name!"
    Abort
${EndIf}
FunctionEnd

Section
; TODO: Write $NameString to config file
SectionEnd