var AFieldname1 = new Array("Subject","SKeyword","SEncrypt","FYear","SFrom","SToDo","SUpper","SCopyRep","SCopySend")
var AFieldTitle1 = new Array("发文标题","主题词","秘密等级","拟稿时间","拟稿人","拟稿部门","主送","抄送","局内分送")function add()
{
windows.status="Updating query...";
form=document.forms[0];
index=form.filednamelist.selectedindex;
FieldNameSel = AFieldname1[index];
connector=getRadioValue(form.andor);
if(connector=="1")
connector="and"
else
connector="or"
selectvalue=form.selectvalue
if(selectvalue=="")
alert("请输入查询值!")
else
{
cond1="(FIELD" + FieldNameSel + "CONTAINS\"" + selectvalue"\")";
allstring = form.allstring.value;
if(allstring=="")
allstring=cond1
else
allstring=cond1+allstring
form.allstring.value=allstring;
}
}
var AFieldTitle1 = new Array("发文标题","主题词","秘密等级","拟稿时间","拟稿人","拟稿部门","主送","抄送","局内分送")function add()
{
windows.status="Updating query...";
form=document.forms[0];
index=form.filednamelist.selectedindex;
FieldNameSel = AFieldname1[index];
connector=getRadioValue(form.andor);
if(connector=="1")
connector="and"
else
connector="or"
selectvalue=form.selectvalue
if(selectvalue=="")
alert("请输入查询值!")
else
{
cond1="(FIELD" + FieldNameSel + "CONTAINS\"" + selectvalue"\")";
allstring = form.allstring.value;
if(allstring=="")
allstring=cond1
else
allstring=cond1+allstring
form.allstring.value=allstring;
}
}
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此句写法是否有误?
改为:
window.status="Updating query...";
selectvalue=form.selectvalue
if(form.selectvalue=="")
alert("请输入查询值!")
selectvalue是空的情况下,不执行alert
为什么 ?
<input name=selectvalue class=text>
始终不能判断这个文本框为空
if(form.selectvalue.value==null || form.selectvalue.value=="")
alert("请输入查询值!")