Avoiding duplicate code between php and javascript
I have a php page with a form on it for adding people to a small group.
For each person being added, there is a with multiple form elements, each named according to the person's number. For example:
<div class="user">
<input type="text" name="user1LastName" />
...
</div>
<div class="user">
<input type="text" name="user2LastName" />
...
</div>
For each person in the database, the php page populates a form sections.
To add additional people, the user can click on a "+" icon, at which time the page uses jQuery to dynamically populate a new . To do this I am simply appending the new div html to the existing form. This means that the javascript page contains all the same html markup (to be appended), as the p开发者_开发问答hp page.
This seems like an unnecessary duplication of code. Whenever I change something in the php page, I also have to change it in the javascript code.
Is there any general method for avoiding such code duplication? The only thing I can think of is to use jQuery to grab the html from an already existing div. But in this case, the values of the form fields for user n will appear in the new code for user n+1.
Thanks.
Capisci :)?
<div class="user" id="user_1">
<input type="hidden" name="uid[0]" value="1"/>
<input type="text" name="lastname[0]" value="user480029"/>
...
</div>
<div class="user" id="user_2">
<input type="hidden" name="uid[1]" value="2"/>
<input type="text" name="lastname[1]" value="arto"/>
...
</div>
Now when adding another field just...
<div class="user" id="user_3943094103945">
<input type="hidden" name="uid[]" value=""/>
<input type="text" name="lastname[]" value=""/>
...
</div>
Then you iterate trough $_POST[] a do what you want.
You have user ID on .user, so I you delete user you can remove that part of HTML (this is more for UX), more importantly, you don't have hundreds of variables but just a few array which you can iterate in one loop. Hope you get the point. Cheers.
The php code should give the javascript a "prototype", which could be modified using javascript. That way, even if there aren't any users, the javascript would still work. This example is obviously missing lots of code (like forms), but it should give you an idea. I haven't tested it because I assume you have to make lots of modification anyways.
<script type="application/x-javascript">
addEventListener("load",function(){
document.getElementById("add-user").addEventListener("click",function(){
var node=document.getElementById("prototype-container").getElementsByClassName("users")[0].cloneNode(true),n=document.getElementById("add-user").getElementsByClassName("users").length,list=node.getElementsByTagName("input");
document.getElementById("user-list").appendChild(node);
node.id="users_"+(n+1);
for(var i=0;i<list.length;++i)
list[i].name&&(list[i].name+="["+n+"]");
},false);
},false);
</script>
</head>
<body>
<div id="prototype-container">
<? /* print out a div without any information in it */ ?>
</div>
<div id="user-list">
<? /* print out divs with some infomation in them */ ?>
</div>
<button id="add-user">add a user</button>
加载中,请稍侯......
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