Question

<form action="#" method="post" id="contactMsg">
    <div class="row">
        <div class="col-md-4">
            <input name="name" id="name"  required="required" type="text"  placeholder="Name">
        </div>
        <div class="col-md-4">
            <input name="email" id="email" required="required" type="text" placeholder="Email">
        </div>
        <div class="col-md-4">
            <input name="subject" id="subject" required="required"  type="text" placeholder="Subject">
        </div>
        <div class="col-md-12">
            <textarea name="comments" id="comment" required="required"  cols="10" rows="10" placeholder="Comments"></textarea>
        </div>
        <div class="col-md-12">
            <input name="comment" id="ContactNow" type="submit" value="Submit">
        </div>
    </div>
</form>

//这里是Ajax代码

var formData = new FormData($("#contactMsg")[0]);

$.ajax({
    url: 'contactMsg.php',
    data:formData,
    cache: false,
    contentType:false,
    processData:false,
    type: 'post',
    success: function(response) {
        $("#contactMsg")[0].reset();
        $("#SucessMsg").fadeIn('slow').delay(3000).fadeOut('slow');
    }
});

我从不使用验证码。我真的不知道这个。请任何人有想法，而不是告诉我，我想添加验证码，然后在调用ajax之前验证它。提前谢谢

Answer 1

参见简单的例子：

$(document).ready(function(){
    var a = (Math.ceil(Math.random()*9))+1;
	var b = (Math.ceil(Math.random()*9))+1;
	var queryText = a+" + "+b+"=";
	document.getElementById('queryString').innerHTML=queryText;
	var result = parseInt(a)+parseInt(b);
	document.getElementById('actualResult').value=result;
});
			
function _validate(){
    if(document.getElementById('actualResult').value == document.getElementById('result').value){
		alert("matched");
	}else{
	      alert("not matched");
	}
			  
}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<body>
    <form action="#" method="post" id="contactMsg">
    	<div class="row">
    	<div class="col-md-4">
    		<input name="name" id="name"  required="required" type="text"  placeholder="Name">
    	</div>
    	<div class="col-md-4">
    		<input name="email" id="email" required="required" type="text" placeholder="Email">
    	</div>
    	<div class="col-md-4">
    		<input name="subject" id="subject" required="required"  type="text" placeholder="Subject">
    	</div>
    	<div class="col-md-12">
    		<textarea name="comments" id="comment" required="required"  cols="10" rows="10" placeholder="Comments"></textarea>
    	</div>
    	<div class="col-md-12">
    		<label id="queryString"></label>
    		<input type="text" value="" id="result"/>
    	</div>
    	<input type="hidden" id="actualResult"/>
    	<div class="col-md-12">
    		<input name="comment" id="ContactNow" type="button" value="Submit" onclick="_validate();">
    	</div>
    </div>
   </form>
</body>

说明：当页面加载时，我们生成随机数并生成查询字符串并在隐藏字段中生成实际结果。当用户提交时，我们检查了用户输入的隐藏字段输入。如果匹配则我们通过，如果没有，我们就阻止了。

Answer 2

您可以使用此代码，其工作正常 you may download captcha images from given link

var val=[];        
val.push("VQ7W3");     /** push value in this array  */
val.push("A1234");     /** To maintain image order here   */
val.push("A32BD");   /** if first image 0_capt.jpeg contains value VQ7W3 so push this value into zero(0) index of array   */
val.push("LD673");
val.push("PQ78V");
val.push("MX81W");
var x;
/**This below method generate random number from 0-5
 * name of image starts with that number will set on 
 * captcha location 
 */
function myFunction() {
    x = Math.floor(Math.random() * 6);     // here 6 stand for how many images you are using return 0-6 number.
	$("#imgCaptchaPlace").html("<img id='abc' src='captcha_images/"+x+"_cpt'/><br>"+val[x])  ;   
}
myFunction();
/**
 * This below method will call on change of input fields where user enter
 * captcha code value
 */
function chaeckCpatch(id)
{
		if($("#"+id).val()==val[x])
		{
				alert("match");
		}
		else
		{
			alert("No match");
		}
	
}

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
</head>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.1.1/jquery.min.js"></script>
<body>
<!--  below div use to display captcha image -->
<div id="imgCaptchaPlace"></div>

<!-- below textfield where user enter captcha value -->
<input type="text" id="captchaText" onchange="chaeckCpatch(this.id);"/>

<!-- include this JS file -->
<script src="captchByAarif.js" type="text/javascript"></script>
</body>
</html>

如何在提交表单之前使用验证码。在HTML JavaScript中

2 个答案: