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JavaScript listens for text box carriage return events and filters text box spaces _javascript Tips

Source: Internet
Author: User
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This article describes how JavaScript listens for text box carriage return events and filters text box spaces. Share to everyone for your reference. as follows: 

<script type= "Text/javascript" language= "JavaScript" > var username = null;
var password = null;
 Get text Box onload = function () {username = document.getElementById ("txtUserName");   
Password = document.getElementById ("Txtpassword");
 //Empty text box function Cleartxt () {username.value = "";
 Password.value = "";
 Username.focus ();
 document.getElementById (' txtUserName '). value= "";
 document.getElementById (' Txtpassword '). value= "";  
document.getElementById (' txtUserName '). focus (); }//Determine function Chktxt () {//delete before and after space Username.value = Username.value.replace (/(^\s*) | (
 \s*$)/g, ""); Password.value = Password.value.replace (/(^\s*) | (
 \s*$)/g, "");
 Sentence null if (Username.value.length = = 0) {alert ("Please enter username!");
 Username.focus ();
 else if (password.value.length = 0) {alert ("Please enter password!");
 Password.focus ();
else document.getElementById ("Btnlogin"). Click (); //Carriage return Listener function OnKey () {if (window.event.keycode==13) {//document.all["Btnlogin"].focus ();//if (document.ac TivEelement.id = "Areset")//Determine the ID of the control with the current focus is areset//{//document.getElementById ("Areset"). Focal ();//} Documen
 T.getelementbyid ("Alogin"). focus ();
 return false; }} </script>

CSS code:

<style type= "Text/css" > 
#btnLogin 
{ 
 width:0px; 
 height:0px; 
 Border-style:none; 
 Background-color:white; 
} 
</style>

HTML code:

<body onkeydown= "OnKey ()" >//The return monitor into the body 
<form id= "Login_form" name= "Login_form" runat= "Server" > 
 <div>
    <label> User: </label><input id= "txtUserName" 
    runat= "Server" Name= "U_name" class= "Input Bold" type= "text"/> 
    <label> Password: </label><input id= "Txtpassword" 
    Server "Name=" U_pass "class=" input "type=" password "/> <a" href= "Javascript:chktxt 
    ()" id= "Alogin" > OK < /a> 
    <%--<a href= "javascript:document.forms[' Login_form '].reset ()" >
    reset </a>--%> 
    <a href= "Javascript:cleartxt ()" id= "Areset" > Reset </a> <asp:button id= "Btnlogin" 
   Server "
   text=" "onclick=" Btnlogin_click "/> 
 </div> 
</form> 
</body>

I hope this article will help you with your JavaScript programming.

This article is an English version of an article which is originally in the Chinese language on aliyun.com and is provided for information purposes only. This website makes no representation or warranty of any kind, either expressed or implied, as to the accuracy, completeness ownership or reliability of the article or any translations thereof. If you have any concerns or complaints relating to the article, please send an email, providing a detailed description of the concern or complaint, to info-contact@alibabacloud.com. A staff member will contact you within 5 working days. Once verified, infringing content will be removed immediately.

Related Keywords:
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