当动态添加元素时,我遇到函数调用的问题。 Here是代码笔示例的链接。函数调用 - onclick - 来自此按钮:
<button id="btnFocus" class="btnFocus" onclick="focusToDIV($(this))">Focus to DIV</button>
功能focusToDIV:
var focusToDIV = function(btnReference){
btnReference.parent().find("#div3").focus();
}
静态添加包含此按钮的第一个元素。所有其他元素都可以添加按钮&#39;添加新的&#39;。使用静态添加元素函数调用focusToDIV并且div3获得焦点。
使用动态添加的元素,未定义btnReference,这就是抛出此错误的原因:
未捕获的TypeError:无法读取属性&#39; parent&#39;未定义的
如何通过动态添加元素使此功能正常工作(通过点击btnFocus将焦点放在div3上)?为什么没有定义btnReference,如果将元素动态添加到DOM?
var focusToDIV = function(btnReference){
btnReference.parent().find("#div3").focus();
}
var addNew = function(){
$("#divMain").append("<div class='divContainer' class='divContainer'> <div id='divInner' class='divInner'>" +
"<div id='div2' class='div2'> <div id='div3' class='div3' contentEditable='true'></div>" +
"</div></div> <button id='btnFocus' class='btnFocus' onclick='focusToDIV($(this))'>Focus to DIV</button> </div>");
}
&#13;
.divMain{
height: 100vh;
width: 100vw;
}
.divContainer{
position: relative;
display: inline-block;
left: 20%;
top: 10%;
}
.divInner{
width: 300px;
height: 300px;
border: 1px solid black;
}
.div2{
position: relative;
left: 20px;
top: 20px;
width: 200px;
height: 100px;
border: 1px solid blue;
}
.btnFocus{
position: absolute;
top: 305px;
}
.div3{
position: relative;
left: 10%;
top: 10%;
width: 150px;
height: 80px;
border: 1px solid red;
}
&#13;
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div id="divMain" class="divMain">
<button id="btnAdd" onclick="addNew()">Add new</button>
<div class="divContainer" class="divContainer">
<div id="divInner" class="divInner" >
<div id="div2" class="div2">
<div id="div3" class="div3" contentEditable="true"></div>
</div>
</div>
<button id="btnFocus" class="btnFocus" onclick="focusToDIV($(this))">Focus to DIV</button>
</div><!-- divContainer -->
</div><!-- divMain -->
&#13;
答案 0 :(得分:2)
您需要将onclick方法从focusToDIV()
更改为focusToDIV($(this))
。
由于元素未通过,因此btnReference未定义,并且您正在调用该未定义变量的方法。
var addNew = function(){
$("#divMain").append("<div class='divContainer' class='divContainer'> <div id='divInner' class='divInner'>" +
"<div id='div2' class='div2'> <div id='div3' class='div3' contentEditable='true'></div>" +
"</div></div> <button id='btnFocus' class='btnFocus' onclick='focusToDIV($(this))'>Focus to DIV</button> </div>");
}