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问由innerHTML添加的对象标记总是空的
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Stack Overflow用户

提问于 2013-06-10 10:26:42

回答 7查看 1K关注 0票数 2

我正在创建一个对象标记onload，并在创建它之后尝试访问对象，如下所示：

function loadFile() {



        alert("loading file");
        gform.MOJWebTwain.HTTPPort = 9080;
        gform.MOJWebTwain.IfSSL = false;
        var result = gform.MOJWebTwain.HTTPDownload('myServer', existingDocumentPath);
        alert("result: "+result);
        var errorString = gform.MOJWebTwain.ErrorString;
        var errorCode = gform.MOJWebTwain.ErrorCode;
        if (!result) {
            alert("errorString: " + errorString);
            alert("errorCode " + errorCode);
        }
        document.body.style.opacity="100";

}

window.onload = function () {
    var DW_DWTContainerID = "gform:scan_area";
    var DW_FULLCLASSID = "123456-abcdef-12345-abcdef-123456"; // fixed
    var DW_PROCLASSID = "3d25aba1-abcdef-12345-abcdef-123456";  // the one in lpk file

    var DW_VersionCode = "6,3,1,0";
    var DW_InWindowsX86;
    var objString = "";

    var DW_ObjectName="MOJWebTwain"
    var DW_Width = 400;
    var DW_Height = 400;
    var DW_CABX86Path = "DynamSoft/DynamicWebTWAIN.cab";
    var DW_CABX64Path = "DynamSoft/DynamicWebTWAINx64.cab";
    var LPK_Path = "DynamSoft/DynamicWebTwain.lpk";
    ua = (navigator.userAgent.toLowerCase());

    objString += "<object id='" + DW_ObjectName + "' "+"width='" + DW_Width +" ' "+"height='" + DW_Height+"' ";

    if (DW_InWindowsX86) objString += "codebase='" + DW_CABX86Path + "#version=" + DW_VersionCode + "' ";
    else objString += "codebase='" + DW_CABX64Path + "#version=" + DW_VersionCode + "' ";

    objString += " classid='clsid:" + DW_FULLCLASSID + "' viewastext>";

    //alert("objString: "+objString);

    objString += " <param name='_cx' value='847'/>";
    objString += " <param name='_cy' value='847'/>";
    objString += " <param name='JpgQuality' value='30'/>";
    objString += " <param name='Manufacturer' value='DynamSoft Corporation'/>";
    objString += " <param name='ProductFamily' value='Dynamic Web TWAIN'/>";
    objString += " <param name='ProductName' value='Dynamic Web TWAIN'/>";
    objString += " <param name='VersionInfo' value='Dynamic Web TWAIN 6,3,1,0'/>";
    objString += " <param name='TransferMode' value='0'/>";
    objString += " <param name='BorderStyle' value='0'/>";
    objString += " <param name='FTPUserName' value=''/>";
    objString += " <param name='FTPPassword' value=''/>";
    objString += " <param name='FTPPort' value='21'/>";
    objString += " <param name='HTTPUserName' value=''/>";
    objString += " <param name='HTTPPassword' value=''/>";
    objString += " <param name='HTTPPort' value='9080' />";
    objString += " <param name='ProxyServer' value=''/>";
    objString += " <param name='IfDisableSourceAfterAcquire' value='0'/>";
    objString += " <param name='IfShowUI' value='0'/>";
    objString += " <param name='IfModalUI' value='-1'/>";
    objString += " <param name='IfTiffMultiPage' value='-1'/>";
    objString += " <param name='IfThrowException' value='0'/>";
    objString += " <param name='MaxImagesInBuffer' value='99'/>";
    objString += " <param name='TIFFCompressionType' value='0'/>";
    objString += " <param name='IfFitWindow' value='-1' />";
    objString += " <param name='IfSSL' value='0' />";
    objString += " </object>";

    var obj2String = "<object "
        +"classid='clsid:"+DW_PROCLASSID+"'"+">"
        +"<param name='LPKPath' value='"+LPK_Path+"'"+"/>";
        +"</object>";

    //alert("obj2String "+obj2String);

    var obj2String = "<object classid='clsid:"+DW_PROCLASSID+"'>"
        +"<param name='LPKPath' value='"+LPK_Path+"'"+"/>";
        +"</object>";

    var objects_string=obj2String +" "+objString;

    DWTContainer = document.getElementById(DW_DWTContainerID);                          
    DWTContainer.innerHTML = objects_string;

    loadFile();
}

如下所示：

<form id="gform">
  <div id=gform:scan_area"">

   </div>
</form>

但我总是知道，我创建的对象是null，在这一行中：

gform.MOJWebTwain.HTTPPort = 9080;

如果该对象是静态地添加到页面中(即不是通过onload)，则不会得到此异常。

javascript

html

dynamic-web-twain

回答 7

Stack Overflow用户

回答已采纳

发布于 2013-06-19 07:39:18

通过使用setTimeout进行修正如下：

setTimeout(function(){
        DWTContainer = document.getElementById(DW_DWTContainerID);
        alert("DWTContainer: "+DWTContainer);
        DWTContainer.innerHTML = objects_string;
        loadFile(editWebScan,existingDocumentPath);
    }, 500);

票数 1

Stack Overflow用户

发布于 2013-06-19 08:55:19

似乎是HTML部件的错误，您的HTML部件如下所示

<form id="gform">
  <div id=gform:scan_area""><!--quote error-->

   </div>
</form>

检查这个，它可以给你想要的结果

<script>
    function loadFile() {
        alert("loading file");
        gform.MOJWebTwain.HTTPPort = 9080;
        gform.MOJWebTwain.IfSSL = false;
        var result = gform.MOJWebTwain.HTTPDownload('myServer', existingDocumentPath);
        alert("result: " + result);
        var errorString = gform.MOJWebTwain.ErrorString;
        var errorCode = gform.MOJWebTwain.ErrorCode;
        if (!result) {
            alert("errorString: " + errorString);
            alert("errorCode " + errorCode);
        }
        document.body.style.opacity = "100";
    }

    window.onload = function() {
        var DW_DWTContainerID = "gform:scan_area";
        var DW_FULLCLASSID = "123456-abcdef-12345-abcdef-123456"; // fixed
        var DW_PROCLASSID = "3d25aba1-abcdef-12345-abcdef-123456";  // the one in lpk file

        var DW_VersionCode = "6,3,1,0";
        var DW_InWindowsX86;
        var objString = "";

        var DW_ObjectName = "MOJWebTwain";
        var DW_Width = 400;
        var DW_Height = 400;
        var DW_CABX86Path = "DynamSoft/DynamicWebTWAIN.cab";
        var DW_CABX64Path = "DynamSoft/DynamicWebTWAINx64.cab";
        var LPK_Path = "DynamSoft/DynamicWebTwain.lpk";
        ua = (navigator.userAgent.toLowerCase());

        objString += "<object id='" + DW_ObjectName + "' " + "width='" + DW_Width + " ' " + "height='" + DW_Height + "' ";

        if (DW_InWindowsX86)
            objString += "codebase='" + DW_CABX86Path + "#version=" + DW_VersionCode + "' ";
        else
            objString += "codebase='" + DW_CABX64Path + "#version=" + DW_VersionCode + "' ";

        objString += " classid='clsid:" + DW_FULLCLASSID + "' viewastext>";

        //alert("objString: "+objString);

        objString += " <param name='_cx' value='847'/>";
        objString += " <param name='_cy' value='847'/>";
        objString += " <param name='JpgQuality' value='30'/>";
        objString += " <param name='Manufacturer' value='DynamSoft Corporation'/>";
        objString += " <param name='ProductFamily' value='Dynamic Web TWAIN'/>";
        objString += " <param name='ProductName' value='Dynamic Web TWAIN'/>";
        objString += " <param name='VersionInfo' value='Dynamic Web TWAIN 6,3,1,0'/>";
        objString += " <param name='TransferMode' value='0'/>";
        objString += " <param name='BorderStyle' value='0'/>";
        objString += " <param name='FTPUserName' value=''/>";
        objString += " <param name='FTPPassword' value=''/>";
        objString += " <param name='FTPPort' value='21'/>";
        objString += " <param name='HTTPUserName' value=''/>";
        objString += " <param name='HTTPPassword' value=''/>";
        objString += " <param name='HTTPPort' value='9080' />";
        objString += " <param name='ProxyServer' value=''/>";
        objString += " <param name='IfDisableSourceAfterAcquire' value='0'/>";
        objString += " <param name='IfShowUI' value='0'/>";
        objString += " <param name='IfModalUI' value='-1'/>";
        objString += " <param name='IfTiffMultiPage' value='-1'/>";
        objString += " <param name='IfThrowException' value='0'/>";
        objString += " <param name='MaxImagesInBuffer' value='99'/>";
        objString += " <param name='TIFFCompressionType' value='0'/>";
        objString += " <param name='IfFitWindow' value='-1' />";
        objString += " <param name='IfSSL' value='0' />";
        objString += " </object>";

        var obj2String = "<object "
                + "classid='clsid:" + DW_PROCLASSID + "'" + ">"
                + "<param name='LPKPath' value='" + LPK_Path + "'" + "/>";
        +"</object>";

        //alert("obj2String "+obj2String);

        var obj2String = "<object classid='clsid:" + DW_PROCLASSID + "'>"
                + "<param name='LPKPath' value='" + LPK_Path + "'" + "/>";
        +"</object>";

        var objects_string = obj2String + " " + objString;
        console.log(objects_string);

        DWTContainer = document.getElementById(DW_DWTContainerID);
        DWTContainer.innerHTML = objects_string;

        loadFile();
    }
</script>

<form id="gform">
  <div id="gform:scan_area">

   </div>
</form>

票数 2

Stack Overflow用户

发布于 2013-06-14 05:04:36

当您调用对象的方法/属性时，请确保它已经就绪。可以通过检查属性值来验证对象状态。以下是一个简单的示例：

window.onload = function (){
var DW_Seed;   // The seed used to detect the control.
DW_Seed = setInterval(DW_ControlDetect, 500);
}
function DW_ControlDetect() {
// If the ErrorCode is 0, it means the control is fully loaded.
if (DWObject.ErrorCode == 0) {
   // loadFile()...
}
}

票数 1

页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持

原文链接：

https://stackoverflow.com/questions/17021712

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