我正在表单(HTML5)中使用谷歌的新repatcha:https://www.google.com/recaptcha
在提交表格之前,是否有方法根据需要检查并标记重述?我想在客户端而不是服务器端验证这一点。这样,我就不必回到表单并警告用户不要为captcha输入任何内容。
我可以使用任何javascript来检查用户是否在repatcha中输入了任何内容?
您可以检查id为g-recaptcha-response
的文本区域字段。您可以执行以下操作:
$('form').submit(function(event) {
if ( $('#g-recaptcha-response').val() === '' ) {
event.preventDefault();
alert('Please check the recaptcha');
}
});
希望这对你有帮助。
使用Ankesh和Lammert的部分解决方案的普通JavaScript实现:
var form = document.getElementById('ctct-custom-form');
form.addEventListener("submit", function(event){
if (grecaptcha.getResponse() === '') {
event.preventDefault();
alert('Please check the recaptcha');
}
}
, false);
表单提交侦听器代码的来源:如何在javascript中侦听表单提交事件?
grecaptcha.getResponse()
-返回Recaptcha的响应。您可以在等条件下进行检查
grecaptcha.getResponse(opt_widget_id) === ""
可选的小部件ID,如果未指定,则默认为创建的第一个小部件。
参考编号:https://developers.google.com/recaptcha/docs/display
我试图改进rylanb的答案。下面的代码可以找到页面中激活g-captcha并阻止提交的所有表单。注意:它假设您的div.g-recaptcha
是form
的子级
const forms = document.querySelectorAll('div.g-recaptcha');
forms.forEach(form=> {
const formParentElement = form.parentElement;
formParentElement.addEventListener("submit", e => {
if (grecaptcha.getResponse() === '') {
e.preventDefault();
alert('Please check the recaptcha');
}
}, false)
});
2022年的工作解决方案
就我个人而言,我无法使用我的captcha获得上述任何解决方案。所以我想我会为那些面临同样问题的人分享我目前的工作解决方案。
我在.js
中的笔记应该能彻底解释解决方案。
JavaScript
// By default do not allow form submission.
var allow_submit = false
function captcha_filled () {
/*
* This is called when Google get's the recaptcha response and approves it.
* Setting allow_submit = true will let the form POST as normal.
* */
allow_submit = true
}
function captcha_expired () {
/*
* This is called when Google determines too much time has passed and expires the approval.
* Setting allow_submit = false will prevent the form from being submitted.
* */
allow_submit = false
}
function check_captcha_filled (e) {
console.log('verify-captcha')
/*
* This will be called when the form is submitted.
* If Google determines the captcha is OK, it will have
* called captcha_filled which sets allow_submit = true
* If the captcha has not been filled out, allow_submit
* will still be false.
* We check allow_submit and prevent the form from being submitted
* if the value of allow_submit is false.
* */
// If captcha_filled has not been called, allow_submit will be false.
// In this case, we want to prevent the form from being submitted.
if (!allow_submit) {
// This call prevents the form submission.
// e.preventDefault()
// This alert is temporary - you should replace it with whatever you want
// to do if the captcha has not been filled out.
alert('ERROR: Please verify you are human by filling out the captcha')
return false
}
captcha_expired()
return true
}
HTML
<form action="post" onsubmit="return check_captcha_filled()">
<!-- form items -->
<div class="g-recaptcha"
data-callback="captcha_filled"
data-expired-callback="captcha_expired"
data-sitekey="your site key">
</div>
</form>
最简单的方法是更改按钮的类型。
<button class="theme-btn" type="button" onclick="checkForm()" id="sign_up_button" >
现在创建一个Java脚本函数来更改验证时提交的类型。
<script type="text/javascript">
//无捕获功能
function checkForm(){
if(!document.getElementById("g-recaptcha-response").value){
alert("Please Prove ! You're not a Robot");
return false;
}else{
document.getElementById("sign_up_button").type = "submit";
return true;
}
}
</script>