[英]validate form JavaScript
I'm trying to validate some of the field in my form. 我正在尝试验证表单中的某些字段。
and I want to check if they have input the correct area code of the required field. 我想检查他们是否输入了所需字段的正确区号。
The area code should be one of 212
, 313
, or 414
区号应的一个
212
, 313
,或414
This is homework so I can't use regular expression, and I'm not really asking for an answer but here is what I'm trying to use but non of them really worked for me 这是家庭作业,所以我不能使用正则表达式,我不是真的要求答案,但这是我正在尝试使用但不是他们真的为我工作
if (input.substr(0,2) != 212|| input.substr(0,2) != 313 || input.substr(0,2) != 414)
Message += " <p>Sorry but you have enter wrong area code!!!</p>";
I've tried used substring
indexOf
but really I don't know non of them really correct in this case. 我已经尝试过使用
substring
indexOf
但实际上我并不知道在这种情况下它们是非常正确的。
Is there anyway to validate but not with the regular expression? 无论如何要验证,但不是正则表达式?
Thanks 谢谢
Try this 尝试这个
if (input.substr(0,3) != 212|| input.substr(0,3) != 313 || input.substr(0,3) != 414)
Message += " <p>Sorry but you have enter wrong area code!!!</p>";
I didn't test it though 我没有测试它
<input type="text" id="num"/>
<div id="msg"></div>
// This should run in a window.onload or $(document).ready() block
var num = document.getElementById('num'),
msg = document.getElementById('msg');
num.onblur = function(){
var areacodes = '212|313|414|',
areacode = this.value.replace(/[^0-9]/, '').substring(0,3),
message = 'Area code validates.';
if (areacode.length < 3 || areacodes.indexOf(areacode + '|') === -1) {
message = "Sorry but you have entered an invalid area code.";
}
msg.innerHTML = message;
};
http://jsfiddle.net/userdude/gfJWX/1 http://jsfiddle.net/userdude/gfJWX/1
input
I'm guessing is a string
variable, and not a DOM
note pointing to an input
element. input
我猜是一个string
变量,而不是指向input
元素的DOM
注释。
Shouldn't this work? 这不应该工作吗?
var str = input.trim().substr(0,3);
if ( !{212:1, 313:1, 414:1}[ str ] ){
Message += " <p>Sorry but you have enter wrong area code!!!</p>";
}
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