使用jquery从动态添加的html代码中调用函数

Question

这是场景

$(document).ready(function(){
 var rowIndex = 0;
 var count = 0;
 function callThisFunction(index, value, count) {
 alert('called');
}

function dynamicContentAdd() {
 rowIndex++;
 count++;

 var row = "<input name='input["+rowIndex+"]' onkeyup = 'callThisFunction("+rowIndex+","+total[1]+","+count+");' id='input"+rowIndex+"'  type='text' class='inputfield' />";

 $("#table").append(row);
}

我在单击按钮时就调用了dynamicContentAdd（）函数，它工作正常。但是不起作用的是它没有在keyup上调用函数callThisFunction（）。出现错误，未定义功能。但是当我在外部js文件中具有相同的功能时，它将成功调用它。这不是从jquery中动态添加的html代码中调用函数的方法吗？

请告诉我。

谢谢

Answer 1

问题是，由于您使用内联事件处理程序，因此js引擎将callThisFunction在全局范围内查找该函数，但是您已将该函数添加到dom ready处理程序中，从而使其成为dom ready处理程序的本地函数，这将导致js引发错误。

解决方案1.将功能设为全局

//since the function is define outside of dom ready handler it is available in the global scope
function callThisFunction(index, value, count) {
    alert('called');
}

$(document).ready(function () {
    var rowIndex = 0;
    var count = 0;

    function dynamicContentAdd() {
        rowIndex++;
        count++;

        var row = "<input name='input[" + rowIndex + "]' onkeyup = 'callThisFunction(" + rowIndex + "," + total[1] + "," + count + ");' id='input" + rowIndex + "'  type='text' class='inputfield' />";

        $("#table").append(row);
    }
})

要么

$(document).ready(function () {
    var rowIndex = 0;
    var count = 0;

    //define the function as a property of the window object again making it available in the public scope
    window.callThisFunction = function (index, value, count) {
        alert('called');
    }

    function dynamicContentAdd() {
        rowIndex++;
        count++;

        var row = "<input name='input[" + rowIndex + "]' onkeyup = 'callThisFunction(" + rowIndex + "," + total[1] + "," + count + ");' id='input" + rowIndex + "'  type='text' class='inputfield' />";

        $("#table").append(row);
    }
})

解决方案2：jQuery方式-使用具有data- *属性的委托事件处理程序

$(document).ready(function () {
    var rowIndex = 0;
    var count = 0;

    $('#table').on('keyup',  '.myfncaller', function(){
        var $this = $(this);
        var index = $this.data('index'), value = $this.data('value'), count = $this.data('count');
    })

    function dynamicContentAdd() {
        rowIndex++;
        count++;

        var row = "<input name='input[" + rowIndex + "]' id='input" + rowIndex + "'  type='text' class='inputfield myfncaller' data-index='" + rowIndex + "' data-value='" + total[1] + "' data-count='" + count + "' />";

        $("#table").append(row);
    }
})