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  • 几个很有用的javascript函数
  •  函数Reset()按Reset按钮后对各字段的内容复位。



      函数submitForms()按submit按钮后对字段合法性检查后发送电子邮件。




      函数isName()对姓名字段进行合法性检查。



      函数isEmail()对电子邮件地址字段进行合法性检查。



      函数isBrowser()对浏览器字段与自动检测的浏览器版本进行比较。



      函数isCountry()对国家字段进行合法性检查。



      函数isComment()对意见字段进行合法性检查,不允许为空值。



      函数isFavorite()对喜欢的站点字段进行合法性检查,不允许为空值。



      程序中还提供了一些技巧,例如,如何判断浏览器的版本,字符串的操作等等。



      结果是以电子邮件的形式提供给你的,里面有客人输入的各个字段。程序比较长,但不难看懂,下面是源代码:





    <HTML>

    <HEAD>

    <TITLE>用javascript编制留言簿程序</TITLE>

    <SCRIPTLANGUAGE="javascript">

    <!--Begin

    //Someone@abc.com是你自己的电子邮件地址

    varemailAddress="Someone@abc.com";

    functiontoName()

    {

    vartoNameval=document.forms[0].elements[1].value;

    toNameval="mailto:Someone@abc.com?subject=GuestBookexample";

    this.document.mail.action=toNameval;

    }

    functionReset(){

    document.forms[0].elements[0].value="";

    document.forms[0].elements[1].value="";

    document.forms[0].elements[2].value=

    navigator.appName+""+navigator.appVersion;

    document.forms[0].elements[3].value="";

    document.forms[0].elements[4].value="";

    document.forms[0].elements[5].value="";

    document.forms[0].elements[0].focus();

    }

    functionsubmitForms(){

    if((isName())&&(isEmail())&&(isBrowser())

    &&(isCountry())&&(isComment())&&(isFavorite()))

    if(confirm("\nYou'reabouttoe-mailtheform.\n\nClick

    onYEStosubmit.\n\nClickonNOtoabort."))

    {

    alert("\nYoursubmissionwillnowbemadeto:

    \n\n"+emailAddress+"\n\n\nThankyou!");

    returntrue;

    }

    else

    {

    alert("\nYouhavechosentoabortthesubmission.");

    returnfalse;

    }

    else

    returnfalse;

    }

    functionisName(){

    varstr=document.forms[0].elements[0].value;

    if(str==""){

    alert("\nTheNAMEfieldisblank.\n\nPleaseenteryourname.")

    document.forms[0].elements[0].focus();

    returnfalse;

    }

    for(vari=0;i<str.length;i++)

    {

    varch=str.substring(i,i+1);

    if(((ch<"a"||"z"<ch)&&(ch<"A"||"Z"<ch))&&ch!='')

    {

    alert("\nTheNAMEfieldonlyacceptsletters

    &spaces.\n\nPleasere-enteryourname.");

    document.forms[0].elements[0].select();

    document.forms[0].elements[0].focus();

    returnfalse;

    }

    }

    returntrue;

    }

    functionisEmail()

    {

    emailAddress=document.forms[0].elements[1].value;

    if(document.forms[0].elements[1].value==""){

    alert("\nTheE-MAILfieldisblank.

    \n\nPleaseenteryoure-mailaddress.")

    document.forms[0].elements[1].focus();

    returnfalse;

    }

    if(document.forms[0].elements[1].value.indexOf('@',0)==-1||

    document.forms[0].elements[1].value.indexOf('.',0)==-1)

    {

    alert("\nTheE-MAILfieldrequiresa\"@\"

    anda\".\"beused.\n\nPleasere-enteryoure-mailaddress.")

    document.forms[0].elements[1].select();

    document.forms[0].elements[1].focus();

    returnfalse;

    }

    else

    {

    toName();

    returntrue;

    }

    }

    functionisBrowser()

    {

    if(document.forms[0].elements[2].value!

    =navigator.appName+""+navigator.appVersion)

    {

    if(confirm("\nYou'vechangedyourbrowser

    type.\n\nClickonOKtokeepchanges.\

    n\nClickonCanceltorestoredetectedbrowser."))

    returntrue

    else

    {

    document.forms[0].elements[2].value=

    navigator.appName+""+navigator.appVersion;

    returntrue;

    }

    }

    else

    returntrue;

    }

    functionisCountry(){

    varstr=document.forms[0].elements[3].value;

    if(str==""){

    alert("\nTheCOUNTRYfieldis

    blank.\n\nPleaseenteryourcountry.")

    document.forms[0].elements[3].focus();

    returnfalse;

    }

    for(vari=0;i<str.length;i++){

    varch=str.substring(i,i+1);

    if(((ch<"a"||"z"<ch)&&

    (ch<"A"||"Z"<ch))&&ch!='')

    {

    alert("\nTheCOUNTRYfieldonlyaccepts

    letters&spaces.\n\nPleasere-enteryourcountry.");

    document.forms[0].elements[3].select();

    document.forms[0].elements[3].focus();

    returnfalse;

    }

    }

    returntrue;

    }

    functionisComment(){

    if(document.forms[0].elements[4].value==""){

    if(confirm("\nYou'reabouttosubmit

    withoutleavingacomment.\n\nClick

    onCANCELtoincludeacomment.\n\nClick

    onOKtocontinuewithoutacomment."))

    returntrue

    else

    {

    document.forms[0].elements[4].focus();

    returnfalse;

    }

    }

    else

    returntrue

    }

    functionisFavorite(){

    if(document.forms[0].elements[5].value==""){

    if(confirm("\nYou'reabouttosubmitwithout

    listingyourfavoritesites.\n\nClickonCANCEL

    toincludefavorites.\n\nClickonOKtocontinue

    withoutlistingfavorites."))

    returntrue

    else

    {

    document.forms[0].elements[5].focus();

    returnfalse;

    }

    }

    else

    returntrue

    }

    //End-->

    </SCRIPT>

    </HEAD>



    <BODY>

    <CENTER>

    <FORMENCTYPE="text/plain"

    NAME="mail"METHOD='GET'

    ACTION='mailto:Someone@abc.com'

    onSubmit="returnsubmitForms()">

    <TABLEBORDER=0WIDTH=400>

    <TR>

    <TDalign="center"><FONTCOLOR=800000>

    <STRONG>Enteryourname:</STRONG></FONT></TD>

    <TDalign="center"><FONTCOLOR=800000>

    <STRONG>Enteryoure-mailaddress:</STRONG>

    </FONT></TD>

    </TR>

    <TR>

    <TDalign="center"><INPUTTYPE="text"

    NAME="name"SIZE=30MAXLENGTH=40></TD>

    </TD>

    <TDalign="center"><INPUTTYPE="text"

    NAME="email"SIZE=30MAXLENGTH=40></TD>

    </TR>

    <TR>

    <TDalign="center"><FONTCOLOR=800000>

    <STRONG>Yourbrowser</STRONG></FONT></TD>

    <TDalign="center"><FONTCOLOR=800000>

    <STRONG>Enteryourcountry:</STRONG></FONT></TD>

    </TR>

    <TR>

    <TDalign="center"><INPUTTYPE="text"

    NAME="browser"SIZE=30MAXLENGTH=60></TD>

    <TDalign="center"><INPUTTYPE="text"

    NAME="country"SIZE=30MAXLENGTH=60>

    </TD>

    </TR>

    </TABLE>

    <CENTER>

    <FONTCOLOR=800000><STRONG>

    Leaveacommentorsuggestion:</strong></font><BR>

    <TEXTAREANAME="comments"

    ROWS=5COLS=50wrap=yes>Comments?

    Suggestions?</TEXTAREA><P><P>

    <FONTCOLOR=800000><STRONG>

    Listyourfavoritesites:</STRONG></FONT><BR>

    <TDalign="center"><TEXTAREANAME="favorites"

    ROWS=5COLS=50wrap=yes>

    AnysitesIshouldtakealookat?</TEXTAREA>

    <P><P>

    <INPUTTYPE="submit"VALUE="Submit">

    <center><INPUTTYPE="reset"VALUE="Reset"

    onClick="Reset()">

    </FORM>

    </CENTER>

    </BODY>
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