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How to delete HTML elements in JavaScript
- coldplay.xixiOriginal
- 2021-03-30 11:43:326044browse
JavaScript method to delete HTML elements: 1. Delete the node, the code is [removeChild (oldNode)]; 2. Delete the option of the list box drop-down menu, the code is [remove (long index)].
The operating environment of this tutorial: Windows 7 system, JavaScript version 1.8.5, DELL G3 computer.
JavaScript method to delete HTML elements:
1. Delete node
removeChild(oldNode ): Delete oldChild child node
<body id="test">
<input id="add" type="button" value="增加" disabled onclick="add();"/>
<input id="del" type="button" value="删除" onclick="del();"/>
<div id="target" style="width:240px;height:50px;border:1px solid black">
被控制的目标元素
</div>
<script>
var body = document.getElementById("test");
var target = document.getElementById("target");
var add = function(){
body.appendChild(target);
document.getElementById("add").disabled="disabled";
document.getElementById("del").disabled="";
}
var del = function(){
body.removeChild(target);
document.getElementById("del").disabled="disabled";
document.getElementById("add").disabled="";
}
</script>
</body>Result
1
2
2. Delete the option of the list box drop-down menu
-
remove (long index): Delete the option at the specified index
<body id="test">
<input id="opValue" type="text" />
<input id="add" type="button" value="增加" onclick="add();"/>
<input id="del" type="button" value="删除" onclick="del();"/>
<select id="show" size="8" style="width:180px"></select>
<script>
var show = document.getElementById("show");
var add = function(){
var op = new Option(document.getElementById('opValue').value);
show.options[show.options.length] = op;
}
var del = function(){
if (show.options.length>0){
show.remove(show.options.length-1);
}
}
</script>
</body>Result
3. Delete rows or cells of the table
-
deleteRow(long index): Delete the row at index in the table
deleteCell(long index): Delete the cell at index of a row
<body >
<input id="delrow" type="button" value="删除表格最后一行" onclick="delrow();"/>
<input id="delcell" type="button" value="删除最后一行最后一格" onclick="delcell();"/><br />
删除第<input id="row" type="text" size="2" />行,
第<input id="cel" type="text" size="2" />列
<input id="chg" type="button" value="删除" onclick="change()"/>
<table id="test" border="1" style="width:500px ;">
<caption> java</caption>
<tr>
<td>1</td>
<td>2</td>
</tr>
<tr>
<td>3</td>
<td>4</td>
</tr>
<tr>
<td>5</td>
<td>6</td>
</tr>
</table>
<script>
var tab = document.getElementById("test");
var delrow = function(){
if (tab.rows.length >0){
tab.deleteRow(tab.rows.length-1);
}
}
var delcell = function(){
var rowList = tab.rows;
var lastRow = rowList.item(rowList.length-1);
if (lastRow.cells.length >0){
lastRow.deleteCell(lastRow.cells.length -1);
}
}
var change = function(){
var tb = document.getElementById("test");
var row = document.getElementById('row').value;
row = parseInt(row);
if (isNaN(row)){
alert("请输入行整数");
return false;
}
var cel = document.getElementById('cel').value;
cel = parseInt(cel);
if (isNaN(cel)){
alert("请输入列整数");
return false;
}
if (row > tb.rows.length || cel> tb.rows[row-1].cells.length){
alert("要删除的不在");
return false;
}
tb.rows[row-1].deleteCell(cel-1);
}
</script>
</body>Result
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