用于添加表行onclick事件的JavaScript

问题描述：

我是Javascript的新手。我想将onclick事件添加到表行。我没有使用JQuery。

I'm new to Javascript. I want to add onclick events to table rows. I'm not using JQuery.

我循环遍历行并使用闭包来确保每行都有外部函数的状态。
循环工作。使用警报，我看到为每次迭代分配的功能。但是当我单击该行时，不会显示任何警报。
下面是可以加载的HTML和代码。

I loop thru the rows and use a closure to make sure I have the state of the outer function for each row. The looping works. Using alerts, I see the function being assigned for each iteration. But when I click the row, no alert is displayed. Below is the HTML and code that can be loaded.

为什么表行事件不起作用？

Why are the table row events not working?

<!doctype html>
<html lang="en">
<body>
<script>
function example4() {
    var table = document.getElementById("tableid4");
    var rows = table.getElementsByTagName("tr");
    for (var i = 0; i < rows.length; i++) {
        var curRow = table.rows[i];
        //get cell data from first col of row
        var cell = curRow.getElementsByTagName("td")[0];
        curRow.onclick = function() {
            return function() {
                alert("row " + i + " data="+ cell.innerHTML);
            };
        };
    }
}
function init() { example4(); }
window.onload = init;   
</script>
<div>
Use loop to assign onclick handler for each table row in DOM. Uses Closure.
    <table id="tableid4" border=1>
      <tbody>
        <tr><td>Item one</td></tr>
        <tr><td>Item two</td></tr>
        <tr><td>Item three</td></tr>
      </tbody>
    </table>
</div>
</body>
</html>

答

这似乎是规范的方式

DEMO

function example4() {
    var table = document.getElementById("tableid4");
    var rows = table.rows; // or table.getElementsByTagName("tr");
    for (var i = 0; i < rows.length; i++) {
        rows[i].onclick = (function() { // closure
            var cnt = i; // save the counter to use in the function
            return function() {
              alert("row"+cnt+" data="+this.cells[0].innerHTML);
            }    
        })(i);
    }
}
window.onload = function() { example4(); }

更新：@ParkerSuperstar建议不需要i in（i）。
我没有对此进行测试，但他的小提琴似乎有效。

UPDATE: @ParkerSuperstar suggested that the i in (i) is not needed. I have not tested this but his fiddle seems to work.

用于添加表行onclick事件的JavaScript

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