• JS常用小代码


    ENTER键可以让光标移到下一个输入框
    
    <input onkeydown="if(event.keyCode==13)event.keyCode=9">
    
    只能是中文
    
    <input onkeyup="value=value.replace(/[ -~]/g,'')" onkeydown="if(event.keyCode==13)event.keyCode=9">
    
    只能是英文和数字.屏蔽了输入法
    
    <input style="ime-mode: disabled" onkeydown="if(event.keyCode==13)event.keyCode=9">
    
    只能输入英文和数字
    
    <input onkeyup="value=value.replace(/[\W]/g,'') " onbeforepaste="clipboardData.setData('text',clipboardData.getData('text').replace(/[^\d]/g,''))" onkeydown="if(event.keyCode==13)event.keyCode=9">
    
    只能是数字
    
    <input onkeyup="value=value.replace(/[^\d]/g,'') " onbeforepaste="clipboardData.setData('text',clipboardData.getData('text').replace(/[^\d]/g,''))">
    
    只能是数字,判断按键 代码如下:
    
    <script language=javascript>
    function   onlyNum()
    {
        if(!((event.keyCode>=48&&event.keyCode<=57)||(event.keyCode>=96&&event.keyCode<=105)||(event.keyCode==8)))
            event.returnValue=false;
    }
    </script>
    <input onkeydown="onlyNum();">
    
    附:获取键盘的KeyCode
    
    <html>
        <head>
            <script language="javascript">
                ns4 = (document.layers) ? true : false;
                ie4 = (document.all) ? true : false;
                function keyDown(e){
                    if(ns4){
                        var nkey=e.which;
                        var iekey='现在是ns浏览器';
                        var realkey=String.fromCharCode(e.which);
                    }
                    if(ie4){
                        var iekey=event.keyCode;
                        var nkey='现在是ie浏览器';
                        var realkey=String.fromCharCode(event.keyCode);
                        if(event.keyCode==32){realkey='\' 空格\''}
                        if(event.keyCode==13){realkey='\' 回车\''}
                        if(event.keyCode==27){realkey='\' Esc\''}
                        if(event.keyCode==16){realkey='\' Shift\''}
                        if(event.keyCode==17){realkey='\' Ctrl\''}
                        if(event.keyCode==18){realkey='\' Alt\''}
                    }
                    alert('ns浏览器中键值:'+nkey+'\n'+'ie浏览器中键值:'+iekey+'\n'+'实际键为'+realkey);
                }
                document.onkeydown = keyDown;
                if(ns4){
                    document.captureEvents(Event.KEYDOWN);
                }
            </script>
        </head>
        <body>
            //Javascript Document.
            <hr>
            <center>
                <h3>
                    请按任意一个键。。。。
                </h3>
            </center>
        </body>
    </html>
    
    再加个找按键的值
    
    <script>
    function show(){
       alert("ASCII代码是:"+event.keyCode);
    }
    </script>
    <body onkeydown="show()">
    
        只能是IP地址
    
        <html>
    
            <head>
                <meta http-equiv="Content-Type" content="text/html; charset=gb2312">
                <meta name="GENERATOR" content="Microsoft FrontPage 4.0">
                <meta name="ProgId" content="FrontPage.Editor.Document">
                <style>
                    .a3 {
                        width: 30;
                        border: 0;
                        text-align: center
                    }
                </style>
                <script>
                    function mask(obj){
                        obj.value=obj.value.replace(/[^\d]/g,'')
                        key1=event.keyCode
                        if (key1==37 || key1==39){ 
                            obj.blur();
                            nextip=parseInt(obj.name.substr(2,1))
                            nextip=key1==37?nextip-1:nextip+1;
                            nextip=nextip>=5?1:nextip
                            nextip=nextip<=0?4:nextip
                            eval("ip"+nextip+".focus()")
                        } 
                        if(obj.value.length>=3) {
                            if(parseInt(obj.value)>=256 || parseInt(obj.value)<=0)
                            {
                                alert(parseInt(obj.value)+"IP地址错误!")
                                obj.value=""
                                obj.focus()
                                return false;
                            }
                            else 
                            { 
                                obj.blur();
                                nextip=parseInt(obj.name.substr(2,1))+1
                                nextip=nextip>=5?1:nextip
                                nextip=nextip<=0?4:nextip
                                eval("ip"+nextip+".focus()")
                            }
                        }
                    }
                    function mask_c(obj)
                    {
                        clipboardData.setData('text',clipboardData.getData('text').replace(/[^\d]/g,''))
                    }
                
                </script>
            <title>IP地址输入</title>
    
            </head>
            <body>
                IP地址输入
                <div
                    style="border- 1; border-color: balck; border-style: solid;  165; font-size: 9pt">
                    <input type=text name=ip1 maxlength=3 class=a3 onkeyup="mask(this)"
                        onbeforepaste=mask_c()>
                    .
                    <input type=text name=ip2 maxlength=3 class=a3 onkeyup="mask(this)"
                        onbeforepaste=mask_c()>
                    .
                    <input type=text name=ip3 maxlength=3 class=a3 onkeyup="mask(this)"
                        onbeforepaste=mask_c()>
                    .
                    <input type=text name=ip4 maxlength=3 class=a3 onkeyup="mask(this)"
                        onbeforepaste=mask_c()>
                </div>
            </body>
    
        </html>
    
        用#default#savehistory防止后退清空text文本框:
    
        <HTML>
            <HEAD>
                <META NAME="save" CONTENT="history">
                <STYLE>
                    .saveHistory {
                        behavior: url(#default#savehistory);
                    }
                </STYLE>
            </HEAD>
            <BODY>
                <INPUT class=saveHistory type=text id=oPersistInput>
                <input type=button
                    onclick='javascript:location.href="http://www.baidu.com/"'
                    value='点击进入,再按后退键试试?'>
            </BODY>
        </HTML>
    
        TEXTAREA自适应文字行数的多少
    
        <textarea rows=1 name=s1 cols=27 onpropertychange="this.style.posHeight=this.scrollHeight"> 
    
      上传预览图片
    
    <img id=pic src=http://www.webjx.com/images/logo.gif>
    <input type=file name=file>
    <input type=button onclick=pic.src=file.value value=预览图片>
    <input type=button onclick=alert(file.value) value=图片地址>
    <input type=button onclick="file.outerHTML=file.outerHTML.replace(/value=\w/g,'')" value="清除file里字">
    
      去掉下拉选项的边框
    
    <div style="position: absolute; left: 10px; top: 10px;  115px; height: 20px; clip: rect(2, 114, 20, 2);"> 
        <select>
         <option>cnpeople</option>
         <option>cnrose</option>
        <option>cnbruce</option>  
       </select>
       </font>
    </div>
    
      TAB的显示
    
    <script>
    function editTab()
    {
         var code, sel, tmp, r
         var tabs=""
         event.returnValue = false
         sel =event.srcElement.document.selection.createRange()
         r = event.srcElement.createTextRange()
    
         switch (event.keyCode)
         {
             case (8)     :
                 if (!(sel.getClientRects().length > 1))
                 {
                     event.returnValue = true
                     return
                 }
                 code = sel.text
                 tmp = sel.duplicate()
                 tmp.moveToPoint(r.getBoundingClientRect().left, sel.getClientRects()[0].top)
                 sel.setEndPoint("startToStart", tmp)
                 sel.text = sel.text.replace(/^\t/gm, "")
                 code = code.replace(/^\t/gm, "").replace(/\r\n/g, "\r")
                 r.findText(code)
                 r.select()
                 break
             case (9)     :
                 if (sel.getClientRects().length > 1)
                 {
                     code = sel.text
                     tmp = sel.duplicate()
                     tmp.moveToPoint(r.getBoundingClientRect().left, sel.getClientRects()[0].top)
                     sel.setEndPoint("startToStart", tmp)
                     sel.text = "\t"+sel.text.replace(/\r\n/g, "\r\t")
                     code = code.replace(/\r\n/g, "\r\t")
                     r.findText(code)
                     r.select()
                 }
                 else
                 {
                     sel.text = "\t"
                     sel.select()
                 }
                 break
             case (13)     :
                 tmp = sel.duplicate()
                 tmp.moveToPoint(r.getBoundingClientRect().left, sel.getClientRects()[0].top)
                 tmp.setEndPoint("endToEnd", sel)
    
                 for (var i=0; tmp.text.match(/^[\t]+/g) && i<tmp.text.match(/^[\t]+/g)[0].length; i++)     tabs += "\t"
                 sel.text = "\r\n"+tabs
                 sel.select()
                 break
             default         :
                 event.returnValue = true
                 break
         }
    }
    </script>
    
    <textarea cols=75 rows=20 onkeydown="editTab()">
    <script>
    alert("ok")
    </script>
    </textarea>
    
      文本框的上/下拉
    
    <form name="cnbruce">
    <textarea name="com">
    </textarea>
    </form>
    <SPAN title='放大输入框' style='FONT-SIZE: 12px; CURSOR: hand'
                onclick=document.cnbruce.com.rows+=4>向下</SPAN>
    <SPAN title='缩小输入框' style='FONT-SIZE: 12px; CURSOR: hand' class='arrow'
                onclick='if(document.cnbruce.com.rows>=4)document.cnbruce.com.rows-=4;else return false'>向上</SPAN>
    
      一个复选框,点击之后一组复选框全部都选上
    
    <input type="checkbox" name="checkA" onpropertychange="for(i=0;i
            <A.children.length ;i++){A.children[i].checked=this.checked}">a
    <br>
    <span id="A">
    <input type="checkbox" name="A1">
    <input type="checkbox" name="A2">
    <input type="checkbox" name="A3">
    </span>
    
      Debug Textarea:在线写 js 脚本的时候,用来即时查错的东西!
    
    <HTML>
    <HEAD>
    <TITLE>Debug Textarea</TITLE>
    <meta http-equiv='Content-Type' content='text/html; charset=gb2312'>
    </HEAD>
    <style>
    * {
        font-size: 12px
    }
    
    body {
        margin: 10px;
        padding: 0px
    }
    
    table.list {
        cursor: default;
        border: 1px solid #cccccc background-color :   #cccccc;
        border-collapse: collapse;
        border-Color: #cccccc;
    }
    </style>
    <script language="javascript">
    // Coded by windy_sk <windy_sk@126.com> 20040205
    
    function reportError(msg,url,line) {
         var str = "You have found an error as below: \n\n";
         str += "Err: " + msg + " on line: " + line;
         alert(str);
         return true;
    }
    
    window.onerror = reportError;
    
    document.onkeydown = function() {
         if(event.ctrlKey){
             switch(event.keyCode) {
                 case 82: //r
                     runcode();
                     break;
                 case 83: //s
                     savecode();
                     break;
                 case 71: //g
                     goto(prompt('Please input the line number', '1'));
                     break;
                 case 65: //a
                     document.execCommand("SelectAll");
                     break;
                 case 67: //c
                     document.execCommand("Copy");
                     break;
                 case 88: //x
                     document.execCommand("Cut");
                     break;
                 case 86: //v
                     document.execCommand("Paste");
                     break;
                 case 90: //z
                     document.execCommand("Undo");
                     break;
                 case 89: //y
                     document.execCommand("Redo");
                     break;
                 default:
                     break;
             }
             event.keyCode = 0;
             event.returnValue = false;
         }
         return;
    }
    
    function show_ln(){
         var txt_ln      = document.getElementById('txt_ln');
         var txt_main      = document.getElementById('txt_main');
         txt_ln.scrollTop = txt_main.scrollTop;
         while(txt_ln.scrollTop != txt_main.scrollTop) {
             txt_ln.value += (i++) + '\n';
             txt_ln.scrollTop = txt_main.scrollTop;
         }
         return;
    }
    
    function editTab(){
         var code, sel, tmp, r
         var tabs=''
         event.returnValue = false
         sel =event.srcElement.document.selection.createRange()
         r = event.srcElement.createTextRange()
    
         switch (event.keyCode){
             case (8)     :
                 if (!(sel.getClientRects().length > 1)){
                     event.returnValue = true
                     return
                 }
                 code = sel.text
                 tmp = sel.duplicate()
                 tmp.moveToPoint(r.getBoundingClientRect().left, sel.getClientRects()[0].top)
                 // 出错检验代码~~~~~~
                 if(sel.parentElement() != tmp.parentElement()) return;
                 sel.setEndPoint('startToStart', tmp)
                 sel.text = sel.text.replace(/^\t/gm, '')
                 code = code.replace(/^\t/gm, '').replace(/\r\n/g, '\r')
                 r.findText(code)
                 r.select()
                 break
             case (9)     :
                 if (sel.getClientRects().length > 1){
                     code = sel.text
                     tmp = sel.duplicate()
                     tmp.moveToPoint(r.getBoundingClientRect().left, sel.getClientRects()[0].top)
                     // 出错检验代码~~~~~~
                     if(sel.parentElement() != tmp.parentElement()) return;
                     sel.setEndPoint('startToStart', tmp)
                     sel.text = '\t'+sel.text.replace(/\r\n/g, '\r\t')
                     code = code.replace(/\r\n/g, '\r\t')
                     r.findText(code)
                     r.select()
                 }else{
                     sel.text = '\t'
                     sel.select()
                 }
                 break
             case (13)     :
                 tmp = sel.duplicate()
                 tmp.moveToPoint(r.getBoundingClientRect().left, sel.getClientRects()[0].top)
                 // 出错检验代码~~~~~~
                 if(sel.parentElement() != tmp.parentElement()) return;
                 tmp.setEndPoint('endToEnd', sel)
                 for (var i=0; tmp.text.match(/^[\t]+/g) && i<tmp.text.match(/^[\t]+/g)[0].length; i++)     tabs += '\t'
                 sel.text = '\r\n'+tabs
                 sel.select()
                 break
             default         :
                 event.returnValue = true
                 break;
         }
         return;
    }
    
    function runcode() {
         var str = document.getElementById("txt_main").value;
         var code_win = window.open('about:blank');
         code_win.document.open();
         code_win.document.writeln("<script>");
         code_win.document.writeln("function reportError(msg,url,line){\nline-=14;\nvar str='You have found an error as below: \\n\\n';\nstr+='Err: '+msg+' on line: '+(line);\nalert(str);\nopener.goto(line);\nopener.focus();\nwindow.onerror=null;\nsetTimeout('self.close()',10);\nreturn true;\n}");
         code_win.document.writeln("window.onerror = reportError;");
         code_win.document.writeln("<\/script>");
         code_win.document.writeln(str);
         code_win.document.close();
         return;
    }
    
    function savecode() {
         var str = document.getElementById("txt_main").value;
         var code_win = window.open('about:blank','_blank','top=10000');
         code_win.document.open();
         code_win.document.writeln(str);
         code_win.document.close();
         code_win.document.execCommand('saveas','','code.html');
         code_win.close();
         return;
    }
    
    function goto(ln) {
         if(!/^\d+$/.test(ln)) return;
         var obj = document.getElementById("txt_main");
         var rng = obj.createTextRange();
         var arr = obj.value.replace(/\r/, "").split(/\n/);
         if(ln>arr.length) ln = arr.length;
         var str_tmp = "";
         for(var i=0; i<ln-1; i++) {
             str_tmp += arr[i];
         }
         rng.moveStart('character',str_tmp.length+1);
         str_tmp = "";
         for(i=ln; i<arr.length; i++) {
             str_tmp += arr[i];
         }
         rng.moveEnd('character',-str_tmp.length); 
         rng.select();
         return;
    }
    
    window.onload = function() {document.getElementById("txt_main").value = "<script>\nalert(')\n<\/script>";}
    </script>
    <BODY>
    <table width='600' class='list' border='1' bgcolor='#eeeeee'
                        bordercolorlight='#000000' bordercolordark='#FFFFFF'
                        cellpadding='0' cellspacing='0'>
       <tr bgcolor='#cccccc'> 
         <td colspan='2' height='20' align='center'>
                                <b>Debug Textarea</b>
                            </td>
       </tr>
       <tr> 
         <td colspan='2'>
             <table width='95%' border='0' align='center'>
           <tr> 
             <td align='center'>
                                            <br />
               <textarea id='txt_ln' name='content' rows='10'
                                                style=' 40px; overflow: hidden; height: 200px; border-right: 0px; text-align: right; line-height: 14px'
                                                onselectstart='this.nextSibling.focus();return false'
                                                readonly></textarea>
                                            <textarea id='txt_main' name='content' rows='10' cols='80'
                                                onkeydown='editTab()' onkeyup='show_ln()'
                                                onscroll='show_ln()' wrap='off'
                                                style='overflow: auto; height: 200px; padding-left: 5px; border-left: 0px; line-height: 14px'></textarea>
               <script>for(var i=1; i<=20; i++) document.getElementById('txt_ln').value += i + '\n';</script>
             </td>
           </tr>
               <tr> 
                 <td align='center'>
                                            <br />
                   <input type='button' value=' 运 行 ' onclick='runcode()'
                                                accesskey='r'>&nbsp;&nbsp;
                   <input type='button' value=' 保 存 ' onclick='savecode()'
                                                accesskey='s'>&nbsp;&nbsp;
                   <input type='button' value=' 跳 转 '
                                                onclick="goto(prompt('Please input the line number', '1'))"
                                                accesskey='g'>&nbsp;&nbsp;
                 </td>
               </tr>
             </table>
         </td>
       </tr>
    </table>
    </BODY>
    </HTML>
    
      获取input的非value值,而是显示文本值
    
    <select name="sss"
                onChange="alert(this.options[this.selectedIndex].text)">
    <option value="1">asdf</option>
    <option value="2">bbbb</option>
    <option value="3">ccc</option>
    </select>
    
      select里的option进行分类列表
    
    <span style="position: absolute; border: 1px inset #d3d6d9"><select
                    style="margin: -2px;  200px">
    <option selected>------------请选择------------</option>
    <optgroup label="JavaScript&VBScript区">
    <option>原    创
    <option>经    典
    <optgroup label="后台区">
    <option>asp&sql
    <option>php&mysql
    
                </select>
            </span>
    
      动态添加
    
    <form name="myForm" method="post">
    <select name="dept_company" size="10" multiple id="dept_company"
                    class="mySelect">
               <option value="">Please Select...</option>
               <option value="a">AA</option>
               <option value="b">BB</option>
               <option value="c">CC</option>
             </select>
                <input name="dept_company_list" type="hidden">
             <input name="button" type="button" class="myButton"
                    onClick="addItem('dept_company','dept_company2')"
                    value="添加--&gt;&gt;">
             <input name="button" type="button" class="myButton"
                    onClick="deleteItem('dept_company2','dept_company')"
                    value="&lt;&lt;--删除">
             <select name="dept_company2" size="10" multiple
                    id="dept_company2" class="mySelect">
             </select>
    </form>
    <script>
    function addItem(fromName,toName){
         eval("var obj1=myForm."+fromName);
         eval("var obj2=myForm."+toName);
         obj1.options[0].selected=false;
         if(obj1.selectedIndex == -1)
             return false;
         var tempValue;
         var tempText;
         for(var i=1;i<obj1.length;i++){ //begin from 1
             if(obj1.selectedIndex == -1)break;
             tempValue=obj1.options[obj1.selectedIndex].value;
             tempText=obj1.options[obj1.selectedIndex].text;
             obj1.options[obj1.selectedIndex]=null;
             obj2.add(new Option(tempText,tempValue),0); 
         }
    }
    function deleteItem(fromName,toName){
         eval("var obj1=myForm."+fromName);
         eval("var obj2=myForm."+toName);
         if(obj1.selectedIndex == -1)
             return false;
         var tempValue;
         var tempText;
         for(var i=0;i<obj1.length;i++){ //begin from 0
             if(obj1.selectedIndex == -1)break;
             tempValue=obj1.options[obj1.selectedIndex].value;
             tempText=obj1.options[obj1.selectedIndex].text;
             obj1.options[obj1.selectedIndex]=null;
             obj2.add(new Option(tempText,tempValue),1); //addItem index is 1
         }
    }
    </script>
    
      提示限制输入的字符数
    
    <script language="JavaScript">
    <!--
    
    function SymError()
    {
       return true;
    }
    
    window.onerror = SymError;
    
    function strlength(str){
         var l=str.length;
         var n=l
         for (var i=0;i<l;i++)
         {
             if (str.charCodeAt(i)<0||str.charCodeAt(i)>255) n++
         }
         return n        
    }
    
    function changebyte(value,length){
         var l=strlength(value)
         if (l<=length) {
             if (document.all!=null) document.all("byte").innerText="还可以输入"+(length-l)+"字节"
         }
         else
         {
             document.all("byte").innerText="输入字节数超出范围"
         }
         return true
    }
    
    function changebyte1(value,length){
         var l=strlength(value)
         if (l<=length) {
             if (document.all!=null) document.all("byte1").innerText="还可以输入"+(length-l)+"字节"
         }
         else
         {
             document.all("byte1").innerText="输入字节数超出范围"
         }
         return true
    }
    
    function changebyte2(value,length){
         var l=strlength(value)
         if (l<=length) {
             if (document.all!=null) document.all("byte2").innerText="还可以输入"+(length-l)+"字节"
         }
         else
         {
             document.all("byte2").innerText="输入字节数超出范围"
         }
         return true
    }
    </script>
    <form method="post" name=test onSubmit="return checkdata()" action="">
    <TEXTAREA
                    onkeydown="return changebyte1(document.test.icqcontent.value,198)"
                    onkeyup="return changebyte1(document.test.icqcontent.value,198)"
                    name=icqcontent cols=40 rows="3"></TEXTAREA>
    <SPAN id=byte1><SCRIPT language=JavaScript>changebyte1(document.test.icqcontent.value,198);</SCRIPT>
                </SPAN>
    </form>
    
      判断填写字数的限制
    
    <script language=javascript>
    function gbcount(message,total,used,remain)
    {
       var max;
       max = total.value;
       if(message.value.length > max){
         message.value = message.value.substring(0,max);
         used.value = max;
         remain.value = 0;
         alert('留言不能超过规定的字数!');
       }
       else{
         used.value = message.value.length;
         remain.value = max - used.value;
       }
    }
    </script>
    
    <form name='myform'>
    <textarea name='GuestContent' cols='59' rows='6'
                    onkeydown=gbcount(this.form.GuestContent,this.form.total,this.form.used,this.form.remain);
                    onkeyup=gbcount(this.form.GuestContent,this.form.total,this.form.used,this.form.remain);></textarea>
    最多字数:<INPUT disabled maxLength=4 name=total size=3 value=20>
    已用字数:<INPUT disabled maxLength=4 name=used size=3 value=0>
    剩余字数:<INPUT disabled maxLength=4 name=remain size=3>
    </form>
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  • 原文地址:https://www.cnblogs.com/rocker/p/1661536.html
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