Javascript 图像输入按钮的动态创建和附加子项不显示为表单元素?
我正在动态创建一个文件上传表单。我将动态创建的表单附加到一个动态创建的div。到目前为止还不错 其中两个表单元素显示为有效的表单字段:类型=文本字段和类型=文件字段 在添加两个type=image字段之后,图像按钮确实会显示在弹出表单中,但由于某种原因,我得到了一个javascript错误“error:TypeError:document.forms.fileform.Upload未定义” 一个警报提示显示document.forms['fileform'].length只有两个元素,而不是我期望的四个元素 在div中创建div和表单的代码:Javascript 图像输入按钮的动态创建和附加子项不显示为表单元素?,javascript,image,forms,Javascript,Image,Forms,我正在动态创建一个文件上传表单。我将动态创建的表单附加到一个动态创建的div。到目前为止还不错 其中两个表单元素显示为有效的表单字段:类型=文本字段和类型=文件字段 在添加两个type=image字段之后,图像按钮确实会显示在弹出表单中,但由于某种原因,我得到了一个javascript错误“error:TypeError:document.forms.fileform.Upload未定义” 一个警报提示显示document.forms['fileform'].length只有两个元素,而不是我期
if(! document.getElementById("fileformdiv")){
var fileformdiv = document.createElement("div");
fileformdiv.setAttribute("id","fileformdiv");
fileformdiv.setAttribute("style","position:relative;top:-200px;left:-250px;height:160px;line-height:30px;width:220px;border:#aaa 1px solid;background:#eee;z-index:10;text-align:left;padding:10px 10px 10px 10px;");
document.getElementById("stampContainer").appendChild(fileformdiv);
var fileform = document.createElement("form");
fileform.setAttribute("enctype","multipart/form-data");
fileform.setAttribute("id","fileform");
fileform.setAttribute("name","fileform");
var descriptionprompt = document.createTextNode("Say something about this file:");
var filedescription = document.createElement("input");
filedescription.setAttribute("id","filedescription");
filedescription.setAttribute("name","filedescription");
filedescription.setAttribute("type","text");
filedescription.setAttribute("style","position:relative;width:200px;height:30px;margin:10px 10px 10px 0px;");
var filename = document.createElement("input");
filename.setAttribute("id","filename");
filename.setAttribute("name","filename");
filename.setAttribute("type","file");
filename.setAttribute("style","position:relative;width:200px;margin:10px 10px 10px 0px;");
var uploadbutton = document.createElement("input");
uploadbutton.setAttribute("name","Upload");
uploadbutton.setAttribute("id","Upload");
uploadbutton.setAttribute("type","image");
uploadbutton.setAttribute("style","position:relative;margin:0px 0px 0px 60px;width:80px;height:30px;");
uploadbutton.setAttribute("src",baseUrl+"images/upload.gif");
var cancelbutton = document.createElement("input");
cancelbutton.setAttribute("name","Cancel");
cancelbutton.setAttribute("id","Cancel");
cancelbutton.setAttribute("type","image");
cancelbutton.setAttribute("style","position:relative;margin:-30px 0px 0px 140px;width:80px;height:30px;");
cancelbutton.setAttribute("src",baseUrl+"images/cancel.gif");
var linebreak = document.createElement("br");
document.getElementById("fileformdiv").appendChild(fileform);
document.forms['fileform'].appendChild(descriptionprompt);
document.forms['fileform'].appendChild(filedescription);
document.forms['fileform'].appendChild(linebreak);
document.forms['fileform'].appendChild(filename);
document.forms['fileform'].appendChild(linebreak);
document.forms['fileform'].appendChild(uploadbutton);
document.forms['fileform'].appendChild(cancelbutton);
document.forms['fileform']['Upload'].onclick = function() { submitFile(); return false; };
document.forms['fileform']['Cancel'].onclick = function() { document.getElementById("fileformdiv").parentNode.removeChild(document.getElementById("fileformdiv")); };
for(i=0;i<document.forms['fileform'].length;i++){
alert(document.forms['fileform'][i].name);
}
}
致:
…瞧,脚本运行正常,没有错误。但是,这些字段不会显示为表单字段。但实际上,这并不重要,因为我可以将onclick附加到它们上,它们会做它们应该做的事情 我做了一些搜索,
元素不包括在表单元素集合中请参见备注,因此您不能从表单元素中引用它。因为已经有了对元素的引用,所以应该使用它
if(! document.getElementById("fileformdiv")){
var fileformdiv = document.createElement("div");
fileformdiv.setAttribute("id","fileformdiv");
fileformdiv.setAttribute("style","position:relative;top:-200px;left:-250px;height:160px;line-height:30px;width:220px;border:#aaa 1px solid;background:#eee;z-index:10;text-align:left;padding:10px 10px 10px 10px;");
document.getElementById("stampContainer").appendChild(fileformdiv);
var fileform = document.createElement("form");
fileform.setAttribute("enctype","multipart/form-data");
fileform.setAttribute("id","fileform");
fileform.setAttribute("name","fileform");
var descriptionprompt = document.createTextNode("Say something about this file:");
var filedescription = document.createElement("input");
filedescription.setAttribute("id","filedescription");
filedescription.setAttribute("name","filedescription");
filedescription.setAttribute("type","text");
filedescription.setAttribute("style","position:relative;width:200px;height:30px;margin:10px 10px 10px 0px;");
var filename = document.createElement("input");
filename.setAttribute("id","filename");
filename.setAttribute("name","filename");
filename.setAttribute("type","file");
filename.setAttribute("style","position:relative;width:200px;margin:10px 10px 10px 0px;");
var uploadbutton = document.createElement("input");
uploadbutton.setAttribute("name","Upload");
uploadbutton.setAttribute("id","Upload");
uploadbutton.setAttribute("type","image");
uploadbutton.setAttribute("style","position:relative;margin:0px 0px 0px 60px;width:80px;height:30px;");
uploadbutton.setAttribute("src",baseUrl+"images/upload.gif");
var cancelbutton = document.createElement("input");
cancelbutton.setAttribute("name","Cancel");
cancelbutton.setAttribute("id","Cancel");
cancelbutton.setAttribute("type","image");
cancelbutton.setAttribute("style","position:relative;margin:-30px 0px 0px 140px;width:80px;height:30px;");
cancelbutton.setAttribute("src",baseUrl+"images/cancel.gif");
var linebreak = document.createElement("br");
fileformdiv.appendChild(fileform);
fileform.appendChild(descriptionprompt);
fileform.appendChild(filedescription);
fileform.appendChild(linebreak);
fileform.appendChild(filename);
fileform.appendChild(linebreak);
fileform.appendChild(uploadbutton);
fileform.appendChild(cancelbutton);
uploadbutton.onclick = function() { submitFile(); return false; };
cancelbutton.onclick = function() { fileformdiv.parentNode.removeChild(fileformdiv); };
for(i=0;i<fileform.length;i++){
alert(fileform[i].name);
}
}
if(!document.getElementById(“fileformdiv”)){
var fileformdiv=document.createElement(“div”);
setAttribute(“id”、“fileformdiv”);
fileformdiv.setAttribute(“样式”、“位置:相对;顶部:-200px;左侧:-250px;高度:160px;线条高度:30px;宽度:220px;边框:#aaa 1px实心;背景:#eee;z索引:10;文本对齐:左侧;填充:10px 10px 10px 10px;”;
document.getElementById(“stampContainer”).appendChild(fileformdiv);
var fileform=document.createElement(“表单”);
setAttribute(“enctype”、“多部分/表单数据”);
setAttribute(“id”、“fileform”);
setAttribute(“名称”、“文件格式”);
var descriptionprompt=document.createTextNode(“说说这个文件:”);
var filedescription=document.createElement(“输入”);
setAttribute(“id”、“filedescription”);
setAttribute(“名称”、“文件描述”);
setAttribute(“类型”、“文本”);
setAttribute(“样式”,“位置:相对;宽度:200px;高度:30px;边距:10px 10px 10px 0px;”);
var filename=document.createElement(“输入”);
setAttribute(“id”、“filename”);
setAttribute(“名称”、“文件名”);
setAttribute(“类型”、“文件”);
setAttribute(“样式”,“位置:相对;宽度:200px;边距:10px 10px 0px;”);
var uploadbutton=document.createElement(“输入”);
setAttribute(“名称”、“上载”);
setAttribute(“id”,“Upload”);
setAttribute(“类型”、“图像”);
uploadbutton.setAttribute(“样式”,“位置:相对;边距:0px 0px 0px 60px;宽度:80px;高度:30px;”);
setAttribute(“src”,baseUrl+“images/upload.gif”);
var cancelbutton=document.createElement(“输入”);
cancelbutton.setAttribute(“名称”、“取消”);
取消按钮。设置属性(“id”、“取消”);
cancelbutton.setAttribute(“类型”、“图像”);
取消按钮.setAttribute(“样式”,“位置:相对;边距:-30px 0px 140px;宽度:80px;高度:30px;”);
setAttribute(“src”,baseUrl+“images/cancel.gif”);
var linebreak=document.createElement(“br”);
fileformdiv.appendChild(fileform);
appendChild(descriptionprompt);
fileform.appendChild(filedescription);
fileform.appendChild(换行符);
appendChild(文件名);
fileform.appendChild(换行符);
appendChild(上传按钮);
appendChild(取消按钮);
uploadbutton.onclick=function(){submitFile();返回false;};
cancelbutton.onclick=function(){fileformdiv.parentNode.removeChild(fileformdiv);};
对于(i=0;i我进行了一些搜索,
元素不包括在表单元素集合中,请参见备注,因此您不能从表单元素引用它。由于您已经有了对元素的引用,因此应该使用它
if(! document.getElementById("fileformdiv")){
var fileformdiv = document.createElement("div");
fileformdiv.setAttribute("id","fileformdiv");
fileformdiv.setAttribute("style","position:relative;top:-200px;left:-250px;height:160px;line-height:30px;width:220px;border:#aaa 1px solid;background:#eee;z-index:10;text-align:left;padding:10px 10px 10px 10px;");
document.getElementById("stampContainer").appendChild(fileformdiv);
var fileform = document.createElement("form");
fileform.setAttribute("enctype","multipart/form-data");
fileform.setAttribute("id","fileform");
fileform.setAttribute("name","fileform");
var descriptionprompt = document.createTextNode("Say something about this file:");
var filedescription = document.createElement("input");
filedescription.setAttribute("id","filedescription");
filedescription.setAttribute("name","filedescription");
filedescription.setAttribute("type","text");
filedescription.setAttribute("style","position:relative;width:200px;height:30px;margin:10px 10px 10px 0px;");
var filename = document.createElement("input");
filename.setAttribute("id","filename");
filename.setAttribute("name","filename");
filename.setAttribute("type","file");
filename.setAttribute("style","position:relative;width:200px;margin:10px 10px 10px 0px;");
var uploadbutton = document.createElement("input");
uploadbutton.setAttribute("name","Upload");
uploadbutton.setAttribute("id","Upload");
uploadbutton.setAttribute("type","image");
uploadbutton.setAttribute("style","position:relative;margin:0px 0px 0px 60px;width:80px;height:30px;");
uploadbutton.setAttribute("src",baseUrl+"images/upload.gif");
var cancelbutton = document.createElement("input");
cancelbutton.setAttribute("name","Cancel");
cancelbutton.setAttribute("id","Cancel");
cancelbutton.setAttribute("type","image");
cancelbutton.setAttribute("style","position:relative;margin:-30px 0px 0px 140px;width:80px;height:30px;");
cancelbutton.setAttribute("src",baseUrl+"images/cancel.gif");
var linebreak = document.createElement("br");
fileformdiv.appendChild(fileform);
fileform.appendChild(descriptionprompt);
fileform.appendChild(filedescription);
fileform.appendChild(linebreak);
fileform.appendChild(filename);
fileform.appendChild(linebreak);
fileform.appendChild(uploadbutton);
fileform.appendChild(cancelbutton);
uploadbutton.onclick = function() { submitFile(); return false; };
cancelbutton.onclick = function() { fileformdiv.parentNode.removeChild(fileformdiv); };
for(i=0;i<fileform.length;i++){
alert(fileform[i].name);
}
}
if(!document.getElementById(“fileformdiv”)){
var fileformdiv=document.createElement(“div”);
setAttribute(“id”、“fileformdiv”);
fileformdiv.setAttribute(“样式”、“位置:相对;顶部:-200px;左侧:-250px;高度:160px;线条高度:30px;宽度:220px;边框:#aaa 1px实心;背景:#eee;z索引:10;文本对齐:左侧;填充:10px 10px 10px 10px;”;
document.getElementById(“stampContainer”).appendChild(fileformdiv);
var fileform=document.createElement(“表单”);
setAttribute(“enctype”、“多部分/表单数据”);
setAttribute(“id”、“fileform”);
setAttribute(“名称”、“文件格式”);
var descriptionprompt=document.createTextNode(“说说这个文件:”);
var filedescription=document.createElement(“输入”);
setAttribute(“id”、“filedescription”);
setAttribute(“名称”、“文件描述”);
setAttribute(“类型”、“文本”);
setAttribute(“样式”,“位置:相对;宽度:200px;高度:30px;边距:10px 10px 10px 0px;”);
var filename=document.createElement(“输入”);
setAttribute(“id”、“filename”);
setAttribute(“名称”、“文件名”);
setAttribute(“类型”、“文件”);
setAttribute(“样式”,“位置:相对;宽度:200px;边距:10px 10px 0px;”);
var uploadbutton=document.createElement(“输入”);
setAttribute(“名称”、“上载”);
setAttribute(“id”,“Upload”);
setAttribute(“类型”、“图像”);
uploadbutton.setAttribute(“样式”,“位置:相对;边距:0px 0px 0px 60px;宽度:80px;高度:30px;”);
setAttribute(“src”,baseUrl+“images/upload.gif”);
var cancelbutton=document.createElement(“输入”);
cancelbutton.setAttribute(“名称”、“取消”);
取消按钮。设置属性(“id”、“取消”);
cancelbutton.setAttribute(“类型”、“图像”);
取消按钮.setAttribute(“样式”,“位置:相对;边距:-30px 0px 140px;宽度:80px;高度:30px;”);
cancelbutton.setAttribute(“src”,baseUrl+”
if(! document.getElementById("fileformdiv")){
var fileformdiv = document.createElement("div");
fileformdiv.setAttribute("id","fileformdiv");
fileformdiv.setAttribute("style","position:relative;top:-200px;left:-250px;height:160px;line-height:30px;width:220px;border:#aaa 1px solid;background:#eee;z-index:10;text-align:left;padding:10px 10px 10px 10px;");
document.getElementById("stampContainer").appendChild(fileformdiv);
var fileform = document.createElement("form");
fileform.setAttribute("enctype","multipart/form-data");
fileform.setAttribute("id","fileform");
fileform.setAttribute("name","fileform");
var descriptionprompt = document.createTextNode("Say something about this file:");
var filedescription = document.createElement("input");
filedescription.setAttribute("id","filedescription");
filedescription.setAttribute("name","filedescription");
filedescription.setAttribute("type","text");
filedescription.setAttribute("style","position:relative;width:200px;height:30px;margin:10px 10px 10px 0px;");
var filename = document.createElement("input");
filename.setAttribute("id","filename");
filename.setAttribute("name","filename");
filename.setAttribute("type","file");
filename.setAttribute("style","position:relative;width:200px;margin:10px 10px 10px 0px;");
var uploadbutton = document.createElement("input");
uploadbutton.setAttribute("name","Upload");
uploadbutton.setAttribute("id","Upload");
uploadbutton.setAttribute("type","image");
uploadbutton.setAttribute("style","position:relative;margin:0px 0px 0px 60px;width:80px;height:30px;");
uploadbutton.setAttribute("src",baseUrl+"images/upload.gif");
var cancelbutton = document.createElement("input");
cancelbutton.setAttribute("name","Cancel");
cancelbutton.setAttribute("id","Cancel");
cancelbutton.setAttribute("type","image");
cancelbutton.setAttribute("style","position:relative;margin:-30px 0px 0px 140px;width:80px;height:30px;");
cancelbutton.setAttribute("src",baseUrl+"images/cancel.gif");
var linebreak = document.createElement("br");
fileformdiv.appendChild(fileform);
fileform.appendChild(descriptionprompt);
fileform.appendChild(filedescription);
fileform.appendChild(linebreak);
fileform.appendChild(filename);
fileform.appendChild(linebreak);
fileform.appendChild(uploadbutton);
fileform.appendChild(cancelbutton);
uploadbutton.onclick = function() { submitFile(); return false; };
cancelbutton.onclick = function() { fileformdiv.parentNode.removeChild(fileformdiv); };
for(i=0;i<fileform.length;i++){
alert(fileform[i].name);
}
}