JQuery和HTML：如何使用echo $ _POST将数据从一个表单获取到另一个表单

Question

im creating an application using JQuery and HTML. In the first form i you are asked to enter a id, then once this is checked you are asked to add in more information. The problem that i am having is that after you press submit in the second page i want to save all the information together, this includes the id entered in the first page.

I forms are created using HTML and the functionality is done using JQuery. I am trying to use the following code but it is not working

var id = echo $_POST['cardNumber'];

I am using this in one of the .js pages. Here is the HTML from the first page that is asking for the ID

<form id="RegisterForm" method="post" data-ajax="false" id="registerCardForm" action="register.html"> 
        <input type="text" id="cardNumberRegField" type="tel"  name="cardNumber" class="required number register" minlength="16" maxlength="16"/> 
        <input name="Submit" type="submit" class="button" value="Register"/>
</form>

Can anyone tell me what is going wrong here?

Answer 1

如果你想在js变量中存储php值你应该这样做，没有引号js变量设置为undefined ：

var id = "<?php echo $_POST['cardNumber']; ?>"