asp.net/javascript,为什么文本框不触发更改事件

asp.net/javascript, why is textbox onChange event does not fire?

本文关键字:事件 文本 net javascript 为什么 asp      更新时间:2023-09-26

我希望在用户选择用户ID后,用户ID显示在第一个只读文本框上,然后onChange事件应该在第一个只读文本框上显示时触发,以便它可以将此用户ID复制到第二个文本框。但是它不起作用,它仅在第一个文本框上显示 userID 时才有效,但 onChange 不会为第二个文本框触发。

这里有半工作代码:

<tr>
    <td align="right">
        Secondary Owner
    </td>
    <td>
        <input id="Hidden1" type="hidden" />
        <asp:TextBox ID="tbAdd_Sowner" runat="server" Enabled="false"></asp:TextBox>
        <input id="Hidden2" type="hidden" />
        <input id="Hidden3" type="hidden" />
        <a href="javascript:void(0)" onclick="GalModalTOCCDialog(Hidden1, tbAdd_Sowner, Hidden2,Hidden3)">
            Get User ID</a>
        <asp:RequiredFieldValidator ID="RequiredFieldValidator7" ValidationGroup="g1" runat="server" ErrorMessage="* Required" ControlToValidate="tbAdd_Sowner"> <b style="color:Red;"> * </b></asp:RequiredFieldValidator>
        <asp:ValidatorCalloutExtender ID="ValidatorCalloutExtender8" runat="server" TargetControlID="RequiredFieldValidator7">
        </asp:ValidatorCalloutExtender>
    </td>
</tr>
<tr>
    <td align="right">Secondary Owners</td>
    <td>
        <asp:TextBox ID="tbAdd_Sphone" runat="server"></asp:TextBox>
        <asp:RequiredFieldValidator ID="RequiredFieldValidator13" ValidationGroup="g1" runat="server" ErrorMessage="* Required" ControlToValidate="tbAdd_Sphone"> <b style="color:Red;"> * </b></asp:RequiredFieldValidator>
        <asp:ValidatorCalloutExtender ID="ValidatorCalloutExtender9" runat="server" TargetControlID="RequiredFieldValidator13">
        </asp:ValidatorCalloutExtender>
    </td>
</tr>

然后 JavaScript 代码 <head> 复制第一个文本框值并放入第二个文本框:

 <script>
        function getUserID() {
            document.getElementById('tbAdd_Sphone').value = document.getElementById('tbAdd_Sowner').value;
        }
document.getElementById('tbAdd_Sowner').onchange = getUserID();
            </script>

编辑:我在这里添加了一个GALModalDialog.js代码,因为你们中的一些人想看看它是什么样子的。我还有 GALToCCDialong.asp它列出了要选择的用户 ID 和 XMLGALListbox.asp它从 AD 中获取用户 ID。

function PopulateListboxFromString(oListbox,vNames,vUserIDs){
    var oArrayUserNames = vNames.value.split(';');
    var oArrayUserIDs = vUserIDs.value.split(';');
    for (var index=0;index < oArrayUserIDs.length;index++) {
        if (oArrayUserNames[index] != ''){
            var oOption = document.createElement("OPTION");
            oListbox.options.add(oOption);
            oOption.innerText = oArrayUserNames[index];
            oOption.value = oArrayUserIDs[index];
        }
    }   
};
function GalModalTOCCDialog(oTONames, oTOUserIDs,oCCNames, oCCUserIDs ) {

        if (oCCNames != null){
            var oInputArray = new Array(oTONames.value,oTOUserIDs.value,oCCNames.value,oCCUserIDs.value);
        } else {
            var oInputArray = new Array(oTONames.value,oTOUserIDs.value,'','');
        }
        var oOutputArray = window.showModalDialog('GalAccess/GALToCCDialog.asp', oInputArray, 'dialogWidth:510px;dialogHeight:400px;status:no;help:no;');


        // Check if we get something back; 
        // User might have closed the window without using the buttons
        if (oOutputArray != null){
            //first element is true if user clicked OK
            if (oOutputArray[0]) {
                if (oCCNames != null){
                    oTONames.value = oOutputArray[1];
                    oTOUserIDs.value = oOutputArray[2];
                    oCCNames.value = oOutputArray[3];
                    oCCUserIDs.value = oOutputArray[4];
                } else {
                    oTONames.value = oOutputArray[1];
                    oTOUserIDs.value = oOutputArray[2];     
                }

            } 
        }
    return false;
}
function GalModalDialog(oSelectObject, oUserID) {
    if (oUserID == null){
        // there is a select object to fill data from
        // fill the input array
        var oInputArray = new Array(new Array(oSelectObject.options.length),new Array(oSelectObject.options.length));
        for (var index=0;index < oInputArray[0].length;index++) {
            oInputArray[0][index] = oSelectObject.options[index].innerText;
            oInputArray[1][index] = oSelectObject.options[index].value;
        };
        var oOutputArray = window.showModalDialog('../GALDialog/GALModalDialog.asp', oInputArray, 'dialogWidth:500px;dialogHeight:320px;status:no;help:no;');
        // Check if we get something back; 
        // User might have closed the window without using the buttons
        if (oOutputArray != null){
            //first element is true if user clicked OK
            if (oOutputArray[0]) {
                //remove existing from end to beginning otherwise not all options are removed.
                var length=oSelectObject.options.length;
                for (var index=length-1;index >= 0;index--) {
                    oSelectObject.options[index] = null;
                };
                // copy the array   
                for (var index=0;index < oOutputArray[1].length;index++) {
                    var oOption = document.createElement("OPTION");
                    oSelectObject.options.add(oOption);
                    oOption.innerText = oOutputArray[1][index];
                    oOption.value = oOutputArray[2][index];
                };
            } 
        }
    } else
    {
        // there are 2 text objects to fill data from; the first contains the name, the secound the userid.
        //if (oSelectObject.value != '' ) {
        //  var oInputArray = new Array(new Array(1),new Array(1));
        //
        //  oInputArray[0][0] = oSelectObject.value;
        //  oInputArray[1][0] = oUserID.value;
        //} else {
                var oInputArray = new Array(new Array(0),new Array(0));
        //}     
        var oOutputArray = window.showModalDialog('../GALDialog/GALModalDialog.asp', oInputArray, 'dialogWidth:500px;dialogHeight:320px;status:no;help:no;');
        if (oOutputArray != null){
            //first element is true if user clicked OK
            if (oOutputArray[0]) {
                // copy the data    
                oSelectObject.value = oOutputArray[1][0];
                oUserID.value = oOutputArray[2][0];

            } 
        }
    }
    return false;
}

编辑:这是GALToCCDialog.asp的代码。在SubmitOnclick函数和else if(vAction == 'OK')中,我单击所选用户ID中的"确定"按钮以提交到文本框。

<SCRIPT ID=clientEventHandlersJS LANGUAGE=javascript>
<!--
function List_onkeydown(oList) {
    if( event.keyCode == 46 ){
        if ((oList.selectedIndex != -1)&&(oList.options[oList.selectedIndex].value != '')){
            oList.options[oList.selectedIndex] = null;
        }
    }
}
//-->
</SCRIPT>

<script language="jscript">

function InitializeListbox(idXML, idSpan){
    // get to the XML specifying the names
    var oSelects;
    var strXML;
    oSelects  = idXML.XMLDocument.documentElement.childNodes;
    strXML = '';
    // Get all the options in 1 string
    for (var index=0;index< oSelects.length;index++){
        strXML = strXML + oSelects[index].xml;
    }
    // the error handlingis there if idSpan refers to multiple objects
    // Insert the options in the html before the end of the SELECT
    // window.alert(strXML);
    //idSpan.innerHTML = replace(idSpan.innerHTML,"</SELECT>",strXML & "</SELECT>");
    idSpan.innerHTML = '<SELECT id=idUserSelect size=12 style="width:190px">' + strXML + '</SELECT>';
}
function SubmitOnclick(vAction, oObject){
    //DistList.action = "DistList.asp?Action=" & vAction ;
    if (vAction == 'Add'){
        if ((idUserSelect.value!='')&&(idUserSelect.value!='Unknown')){
            var oOption = document.createElement("OPTION");
            oObject.options.add(oOption);
            oOption.innerText = idUserSelect.options[idUserSelect.selectedIndex].text;
            oOption.value = idUserSelect.options[idUserSelect.selectedIndex].value;
        }
    }   else if(vAction == 'Find') {
        idXMLUsers.src ='XMLGALListbox.asp?Searchstring=' + SearchString.value;
    } else if(vAction == 'Remove'){
        if ((idMyList.selectedIndex != -1)&&(idMyList.options[idMyList.selectedIndex].value != '')){
            idMyList.options[idMyList.selectedIndex] = null;
        }
    } else if(vAction == 'OK'){
        //window.returnValue = cal.day + ' ' + MonthNames[cal.month-1] + ' ' + cal.year ;
        // create an array
        var TONames = ''
        var TOUserIDs = ''
        var CCNames = ''
        var CCUserIDs = ''
        for (var index = 0; index < 1; index++) {
            TONames = TONames + idTOList.options[index].innerText;
            TOUserIDs = TOUserIDs + idTOList.options[index].value;
        };
        //Commented out by Nick, use if you want multiple userIDs etc...
        //for (var index=0;index < idTOList.options.length;index++) {
        //  TONames = TONames + idTOList.options[index].innerText  ;
        //  TOUserIDs = TOUserIDs + idTOList.options[index].value ;         
        //};
        //for (var index=0;index < idCCList.options.length;index++) {
            //CCNames = CCNames + idCCList.options[index].innerText ;
            //CCUserIDs = CCUserIDs + idCCList.options[index].value ;
        //};
        var oArray = new Array(true,TONames,TOUserIDs,CCNames,CCUserIDs);
        window.returnValue = oArray;
        //window.alert(TONames);
        //window.alert(TOUserIDs);
        //window.alert(CCNames);
        //window.alert(CCUserIDs);
        window.close();
    } else if(vAction == 'Cancel'){
        var oArray = new Array(false);
        window.returnValue = oArray;
        window.close();
    }   
}
function OnBodyLoad() {
    //window.alert('test');
    //clear all list data
    try{
        var oArray = window.dialogArguments;
        //PopulateListboxFromString(idTOList,oArray[0],oArray[1])
        //PopulateListboxFromString(idCCList,oArray[2],oArray[3])
    } catch(e)
    {
    }
};
function PopulateListboxFromString(oListbox,vNames,vUserIDs){
    var oArrayUserNames = vNames.split(';');
    var oArrayUserIDs = vUserIDs.split(';');
    for (var index=0;index < oArrayUserIDs.length;index++) {
        if (oArrayUserNames[index] != ''){
            var oOption = document.createElement("OPTION");
            oListbox.options.add(oOption);
            oOption.innerText = oArrayUserNames[index];
            oOption.value = oArrayUserIDs[index];
        }
    }   
};
function OnBodyLoad__() {
    //window.alert('test');
    try{
        var oArray = window.dialogArguments;
        for (var index=0;index < oArray[0].length;index++) {
            var oOption = document.createElement("OPTION");
            idMyList.options.add(oOption);
            oOption.innerText = oArray[0][index];
            oOption.value = oArray[1][index];
        };
    } catch(e)
    {
    };
};
</script>
<body class="cellcolorlightest content" onload="OnBodyLoad();">
<xml id="idXMLUsers" src="XMLGALListbox.asp?Searchstring=" ondatasetcomplete="InitializeListbox(idXMLUsers, idUsers);"></xml>
    <table class="TableBorderNormal" width="100%" border=0 cellspacing="1" cellpadding="1">
    <colgroup>
        <col width="50%"></col><col></col><col width="50%"></col>
        <thead>
        <tr>
         <td colspan="3" class="TDvwvInfo" align="left"><STRONG>Find Name</STRONG><br><FONT size=2>Type name and hit "Search"</FONT></td>
        </tr>
        <tr>
         <td  class="TDvwvInfo" align="left"><input name="SearchString" style="WIDTH: 190px" size="20"> &nbsp;</td>
         <td class="TDvwvInfo" align="middle" valign=top><input  type="button" value="Search" name="Find" onclick="SubmitOnclick('Find')"></td>
         <td class="TDvwvInfo" align="left"></td>
        </tr>
        <tr>
         <td class="TDvwvInfo" align="left" nowrap><STRONG>Users found</STRONG><br><FONT size=2>Select from list and hit "Select" to add</FONT></td>
         <td class="TDvwvInfo" align="middle"></td>
         <td class="TDvwvInfo" align="left" valign=top><STRONG>Get User ID</STRONG><br></td>
        </tr>
        </thead>
        <tr>
         <td class="TDvwv" align="left" width="33%" rowspan=2  valign=top><span id="idUsers">   </span> </td>               
         <td class="TDvwvInfo" align="middle" valign=top width="33%">
         <input  type="button" value="Select &gt;" name="Add" onclick="SubmitOnclick('Add', idTOList);"><br><br>&nbsp;
         </td>
         <td class="TDvwv" align="left" width="33%"  valign=top>
          <select id="idTOList" size="5" style="WIDTH: 190px" LANGUAGE=javascript onkeydown="return List_onkeydown(this)"> </select><br>&nbsp;
          <br />
          <b style="color:red">* Only add one user, if you added the wrong user click cancel and try again.</b>
          </td>
        </tr>
            <tr>
                 <td align=middle  valign=top>
                 <!-- <input type="hidden" value="CC  >" name="CC" onclick="SubmitOnclick('Add', idCCList);" disabled="disabled"><br><br>&nbsp;--> <!--INPUT name=Remove onclick="SubmitOnclick('Remove');" type=button value="  < Remove"--></td>
                 <td align=left  valign=top>
                  <!--<select id=idCCList size=5 style="WIDTH: 190px" LANGUAGE=javascript onkeydown="return List_onkeydown(this)" disabled="disabled" visible="false"></select></td>-->
            </tr>
        <tr>
         <td align="middle" ></td>
         <td align=middle></td>
         <td align=left>
          <input type="button" value="OK" name="OK" onclick="SubmitOnclick('OK',null);">&nbsp;&nbsp;
          <input type="button" value="Cancel" name="Cancel" onclick="SubmitOnclick('Cancel',null);"></td>
        </tr>
    </table>
</body>
</html>

使用

document.getElementById('<%= tbAdd_Sphone.ClientID %>')

而不是

document.getElementById('tbAdd_Sphone')

MSDN 控件.客户端 ID 属性

通过 JavaScript 更改 tbAdd_Sowner 的值(我假设通过您的 GalModalTOCCDialog 函数)不会触发 onchange 事件。

设置值后,可以手动触发该事件:

document.getElementById('tbAdd_Sowner').onchange();

虽然我很惊讶你没有像@IrfanTahirKheli显示的那样对getElementById有问题,这对你来说应该很好......因此,您的标记中可能缺少一些部分,我们需要为您提供正确的帮助。

您需要认真考虑的其他事项是不要使用内联样式,也不要使用表格进行格式设置。

由于您似乎对我添加的内容有问题,因此这是另一种方法。从asp:TextBox中删除onChange,然后从javascript中完成所有操作:

 document.getElementById('tbAdd_Sowner').value = 'somevalue';
 document.getElementById('tbAdd_Sowner').onchange = getUserID();

你不能仅仅通过从javascript设置值来制作更改事件。下面是使用触发器的示例。

 <script>
       $(document).ready(function () {
           $(".tbAdd_Sowner").on('change', function () {
               var owner = $('.tbAdd_Sowner').val();
               $('.tbAdd_Sphone').val(owner);
           });
           $(".aGetID").on('click', function () {
               var tbOwner = $('.tbAdd_Sowner');
               var hidden1 = $('.Hidden1');
               var hidden2 = $('.Hidden2');
               var hidden3 = $('.Hidden3');
               GalModalTOCCDialog(hidden1, tbOwner, hidden2, hidden3);
           });
           function GalModalTOCCDialog(Hidden1, tbAdd_Sowner, Hidden2, Hidden3) {
               $(tbAdd_Sowner).val(' ').trigger('change');
           }
           $('.tbAdd_Sowner').change(function () {
               $(this).removeAttr('disabled');
           });
       });
    </script>

这是您的代码,删除这些验证器

<table>
        <tr>
            <td align="right">Secondary Owner
            </td>
            <td>
                <input id="Hidden1" type="hidden" value="1" class="Hidden1"  />
                <asp:TextBox ID="tbAdd_Sowner" OnTextChanged="tbAdd_Sowner_TextChanged" CssClass="tbAdd_Sowner" AutoPostBack="true" runat="server" Enabled="false"   ></asp:TextBox>
                <input id="Hidden2" type="hidden" class="Hidden2" />
                <input id="Hidden3" type="hidden" class="Hidden3" />
                <a href="javascript:void(0)" id="aGetID" class="aGetID" >Get User ID</a>
            </td>
        </tr>
        <tr>
            <td align="right">Secondary Owners</td>
            <td>
                <asp:TextBox ID="tbAdd_Sphone" runat="server" CssClass="tbAdd_Sphone" ></asp:TextBox>
            </td>
        </tr>
    </table>

服务器端。

protected void tbAdd_Sowner_TextChanged(object sender, EventArgs e)
        {
            tbAdd_Sowner.Text = "123";
        }

使用此<asp:TextBox ID="TextBox1" runat="server" onkeypress="document.getElementById('id').Value=this.value;" />

就像其他人在他们的回答中提到的那样,

  <asp:TextBox id="tbAdd_Sphone" runat="server" />

将具有以生成的 HTML 为前缀的服务器端动态客户端 ID。如果您在选择的浏览器中看到页面的源代码(或使用开发人员工具),您会注意到您的 ID 与您传递给方法调用的 ID 不同,即如下所示:

<textarea id="ctl00_OuterASPControlID_tbADD_Sphone"></textarea>

如果类也是动态前缀,则可以使用 class="tbAdd_Sphone" 将类名保持静态。或者,尝试按 ID 获取元素

<%=tbAdd_Sphone.ClientID %>

可以将 ClientID 模式设置为静态,也可以尝试使用唯一 ID。

另一件需要注意的事情是,javascript 有一个特殊的行为。如果在调用中正确传入了一定数量的变量调用方法,则它将仅在函数中使用这些值。如果有空/未定义的数据传递到调用中,则其余参数将被忽略。

functionName:function(parameter1, parameter2) { 
            //Default behavior can be overridden if parameter2 is not passed in as expected.
            if(parameter2 ==null || parameter2=='undefined') { 
                parameter2 = "Some value"; 
                    } 
}

    functionName("testPar1");               //Works but parameter2 is not passed in as expected
    functionName("testPar1", "testPar2");   //Works
    functionName("testPar1", undefined);    //Works, but parameter2 is not passed in as expected

如果你需要使用 id for phone,要么执行子字符串搜索以通过实际 ID 获取元素,要么在 javascript 中使用 getElementsByTag 来搜索文本框,您可以使用任何其他属性,例如在纯 Javascript 中:

var x = document.getElementsByTag("textbox"); 
if(x!=null && x.attribute('class') == 'tbAdd_Sphone' )  { 
 var valueX = x.attribute('value'); 
}