动态地将一个div转换为一个按钮 [英] Turn a div into a button dynamically

问题描述

我似乎没有找到任何方法来解决这个问题..所以我想即时通讯需要一些帮助..
im使一个phonegap应用程序，其中我有一个sqlite数据库。我执行一个查询和从数据库中获得一个动态创建的div的结果，事情是，我想为每个记录，我解压缩，使包含它的div，作为一个可编辑角色的按钮..

$例如b $ b

可以说我有一个带有这些列的数据库id option1 option2，我有三个记录..
这意味着我将有三个div
i想要每个div都是一个按钮，以便如果用户点击它可以执行删除（或编辑/更新）查询而不担心id
，例如，如果他选择div2，则执行查询以删除第二条记录。

我的代码到目前为止。

  for（var i = 0; i< len; i ++）{
 var test1 = results.rows.item（i）.option1; 
 var d = new Date（）; 
 d.setTime（results.rows.item（i）.date）; 
 var newLI = document.createElement（LI）; 
 newLI.className = lt; 
 newLI.id = results.rows.item（i）.id; 
 var container =（< div id = \+ results.rows.item（i）.id +\class = \test\>< div id = \text \> option1< / div>< div id = \data \>+ test1 +< / div>< / div>）; 
 newLI.innerHTML = cont; 
 var gl = document.getElementById（sqltest）; 
 gl.appendChild（newLI）; 
} 
 for（var i = 0; i< len; i ++）{
 var divid =＃+ results.rows.item（i）.id; （click，function（）{
 alert（divid）; 
}）
} 
 
< ul ID = sqltest语句 >< / UL> 
  

上面代码的问题是，虽然每个div都得到正确的ID，但当我点击它时，我总是得到相同的结果，例如＃1，尽管我可能有3个div ..
而不是结果

  div1 alert＃1 div2 alert＃2 
  

我得到

  div1警报＃1 div2警报＃1 
  

<我已经使用alert来简化它，而不是提示，从SQLDB将会有 DELETE WHERE id = results.rows.item（i）.id;

解决方案

由于JavaScript范围和闭包的工作方式，您总是会检索相同的'divid'变量。这是一个非常常见的错误。你可以googlejavascript closure臭名昭着的循环来获得更多关于这个的信息。

你应该用替换：

pre $ code $ for（var i = 0; i< len; i ++）{

（function（）{
var divid =＃+ results.rows.item（i）.id;
$（divid）.on（click，function（）{
alert（divid）;
}）;
}）（）;
}

这样，变量 divid 被声明为不同的范围每次。

我不明白这是你遇到的唯一问题。

i don't seem to find any way to work this out..so i guess i m going to need some help.. i m making a phonegap application in which i have an sqlite database.I perform a query and get the results in a dynamically created div from the database, the thing is that i want for each record that i extract to make the div that contains it, as a button with an editable role..

for instance lets say that i have a db with these columns id option1 option2 and i have three records.. this means that i will have three divs i want, each div to be a button so that if user clicks on it to be able to perform a delete (or edit/update) query without being worried about id for instance, if he selects div2 do perform a query that will delete second record..

my code so far..

for (var i = 0; i < len; i++) {
    var test1 = results.rows.item(i).option1;
    var d = new Date();
    d.setTime(results.rows.item(i).date);
    var newLI = document.createElement("LI");
    newLI.className = lt;
    newLI.id = results.rows.item(i).id;
    var container = ("<div id=\"" + results.rows.item(i).id + "\" class=\"test\"><div id=\"text\">option1</div><div id=\"data\">" + test1 + "</div></div>");
    newLI.innerHTML = cont;
    var gl = document.getElementById("sqltest");
    gl.appendChild(newLI);
}
for (var i = 0; i < len; i++) {
    var divid = "#" + results.rows.item(i).id;
    $(divid).on("click", function () {
        alert(divid);
    })
}

<ul id="sqltest"></ul>

problem with above code, is that although each div gets the correct id, when i click on it, i always get the same result for instance #1 although i may have 3 divs.. instead of having as a result

div1 alert #1 div2 alert #2 

i get

div1 alert #1 div2 alert#1

I've used alert just to simplify it, instead of alert there will be DELETE from SQLDB WHERE id=results.rows.item(i).id;

解决方案

You are retreiving always the same 'divid' variable, because of the way javascript scope and closures work. This is a very common mistake. You can google "javascript closure infamous loop" to get more information about this.

You should replace your for with this:

for (var i = 0; i < len; i++) {

    (function () {
        var divid = "#" + results.rows.item(i).id;
        $(divid).on("click", function () {
            alert(divid);
        });
    })();
}

That way, the variable divid is declared in different scopes each time.

I didn't understand if that is the only problem you are having.

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