验证后将焦点设置到文本框表单元素
set focus to textbox form element following Validation
我在执行验证的表单上有许多字段,如果验证失败,我想关注这些字段。验证工作正常,即 rtnStr,但 focus() 不会落在任何文本框字段上,即 vCtrl。它保留在“提交”按钮上。
<script language="javascript">
function ValidateForm() {
var rtnStr = "";
var vCtrl = "";
//Contact Details //
if (document.contactform.txtforename.value == "") {
rtnStr = rtnStr + " - Please enter your Forename.\n"
if (vCtrl == "") {
vCtrl = "txtforename";
}
}
if (document.contactform.txtSurname.value == "") {
rtnStr = rtnStr + " - Please enter your Surname.\n"
if (vCtrl == "") {
vCtrl = "txtSurname";
}
}
if (rtnStr != "") {
alert(rtnStr)
window.setTimeout(function () {
document.getElementById(vCtrl).focus();
}, 0);
return false;
}
else {
return true;
}
}
</script>
问题是 vCtrl 是一个字符串,它是表单的 name 而不是 document.getElementById 的 id (vCtrl).focus() 正在寻找。解决这个问题的方法是让 vCtrl 存储 DOM 元素而不是文本字符串。
<script language="javascript">
function ValidateForm() {
var rtnStr = "";
var vCtrl = "";
//Contact Details //
if (document.contactform.txtforename.value == "") {
rtnStr = rtnStr + " - Please enter your Forename.\n"
if (vCtrl == "") {
vCtrl = document.contactform.txtforename;
}
}
if (document.contactform.txtSurname.value == "") {
rtnStr = rtnStr + " - Please enter your Surname.\n"
if (vCtrl == "") {
vCtrl = document.contactform.txtSurname;
}
}
if (rtnStr != "") {
alert(rtnStr)
vCtrl.focus();
return false;
}
else {
return true;
}
}
</script>
我在执行验证的表单上有许多字段,如果验证失败,我想关注这些字段。验证工作正常,即 rtnStr,但 focus() 不会落在任何文本框字段上,即 vCtrl。它保留在“提交”按钮上。
<script language="javascript">
function ValidateForm() {
var rtnStr = "";
var vCtrl = "";
//Contact Details //
if (document.contactform.txtforename.value == "") {
rtnStr = rtnStr + " - Please enter your Forename.\n"
if (vCtrl == "") {
vCtrl = "txtforename";
}
}
if (document.contactform.txtSurname.value == "") {
rtnStr = rtnStr + " - Please enter your Surname.\n"
if (vCtrl == "") {
vCtrl = "txtSurname";
}
}
if (rtnStr != "") {
alert(rtnStr)
window.setTimeout(function () {
document.getElementById(vCtrl).focus();
}, 0);
return false;
}
else {
return true;
}
}
</script>
问题是 vCtrl 是一个字符串,它是表单的 name 而不是 document.getElementById 的 id (vCtrl).focus() 正在寻找。解决这个问题的方法是让 vCtrl 存储 DOM 元素而不是文本字符串。
<script language="javascript">
function ValidateForm() {
var rtnStr = "";
var vCtrl = "";
//Contact Details //
if (document.contactform.txtforename.value == "") {
rtnStr = rtnStr + " - Please enter your Forename.\n"
if (vCtrl == "") {
vCtrl = document.contactform.txtforename;
}
}
if (document.contactform.txtSurname.value == "") {
rtnStr = rtnStr + " - Please enter your Surname.\n"
if (vCtrl == "") {
vCtrl = document.contactform.txtSurname;
}
}
if (rtnStr != "") {
alert(rtnStr)
vCtrl.focus();
return false;
}
else {
return true;
}
}
</script>