Javascript 如何获取dom创建的单选按钮的实际标签值/文本?
基本上,我正在尝试使用getElementById获取一个带有实际标签的警报框(选择编辑或删除的标签)。。。由dom创建,但如果我在Javascript 如何获取dom创建的单选按钮的实际标签值/文本?,javascript,jquery,html,dom,Javascript,Jquery,Html,Dom,基本上,我正在尝试使用getElementById获取一个带有实际标签的警报框(选择编辑或删除的标签)。。。由dom创建,但如果我在alert(a)之后取消注释代码并删除alert(a)它甚至不会为我创建按钮。。知道怎么做吗?知道我做错了什么吗 <HTML> <HEAD> <TITLE> New Document </TITLE> <SCRIPT LANGUAGE="JavaScript"> function createR
alert(a)
之后取消注释代码并删除alert(a)
它甚至不会为我创建按钮。。知道怎么做吗?知道我做错了什么吗
<HTML>
<HEAD>
<TITLE> New Document </TITLE>
<SCRIPT LANGUAGE="JavaScript">
function createRadio(){
var objDiv = document.getElementById("radioDiv");
var radioItem1 = document.createElement("input");
radioItem1.type = "radio";
radioItem1.name = "radioGrp";
radioItem1.id = "rad1";
radioItem1.value = "myradio1";
// radioItem1.defaultChecked = true;
// radioItem1.checked = true;
var radioItem2 = document.createElement("input");
radioItem2.type = "radio";
radioItem2.name = "radioGrp";
radioItem2.id = "rad2";
radioItem2.value = "myradio2";
// var pA= prompt("Type name for 1");
// var pB= prompt("Type name for 2");
var objTextNode1 = document.createTextNode("Edit");
var objTextNode2 = document.createTextNode("Delete");
var objLabel = document.createElement("label");
objLabel.htmlFor = radioItem1.id;
objLabel.appendChild(radioItem1);
objLabel.appendChild(objTextNode1);
var objLabel2 = document.createElement("label");
objLabel2.htmlFor = radioItem2.id;
objLabel2.appendChild(radioItem2);
objLabel2.appendChild(objTextNode2);
objDiv.appendChild(objLabel);
objDiv.appendChild(objLabel2);
}
function test()
{
// var a = document.getElementById("radioDiv").firstChild;
var a = document.getElementById("radioDiv").firstChild;
alert(a);
// if (a=="Edit")
// {
// alert("Edit");
// }
// else if (a=="Delete")
// {
// alert("Delete");
// }
// else()
// {
// alert("Try Again");
// }
}
</SCRIPT>
</HEAD>
<BODY>
<BUTTON onclick="createRadio()">Create Radio Buttons</BUTTON>
<BUTTON onclick="test()">Alert</BUTTON>
<div id="radioDiv"></div>
</BODY>
</HTML>
新文件
函数createRadio(){
var objDiv=document.getElementById(“radioDiv”);
var radiotem1=document.createElement(“输入”);
放射性项目1.type=“无线电”;
放射性项目1.name=“放射性RP”;
放射性元素1.id=“rad1”;
放射性元素1.value=“myradio1”;
//radioItem1.defaultChecked=true;
//放射性元素1.checked=真;
var radiotem2=document.createElement(“输入”);
放射性元素2.type=“无线电”;
放射性项目2.name=“放射性RP”;
放射性元素2.id=“rad2”;
放射性元素2.value=“myradio2”;
//var pA=提示(“1的类型名称”);
//var pB=提示(“2的类型名称”);
var objTextNode1=document.createTextNode(“编辑”);
var objTextNode2=document.createTextNode(“删除”);
var objLabel=document.createElement(“标签”);
objLabel.htmlFor=放射性元素1.id;
对象标记为附属物(放射性元素1);
objLabel.appendChild(objTextNode1);
var objLabel2=document.createElement(“标签”);
objLabel2.htmlFor=放射性元素2.id;
objLabel2.appendChild(放射性元素2);
objLabel2.appendChild(objTextNode2);
objDiv.appendChild(objLabel);
objDiv.appendChild(objLabel2);
}
功能测试()
{
//var a=document.getElementById(“radioDiv”).firstChild;
var a=document.getElementById(“radioDiv”).firstChild;
警报(a);
//如果(a==“编辑”)
// {
//警告(“编辑”);
// }
//否则如果(a==“删除”)
// {
//警告(“删除”);
// }
//else()
// {
//警惕(“重试”);
// }
}
创建单选按钮
警觉的
(编辑)好的,看看这个!并尝试用这种技术对未来的问题进行编码:泛型、短函数和注释。祝你好运
<html>
<head>
<script>
/**
* Create a group of radiobuttons
* @param whereToAttach Div to attach generated things
* @param groupname Name for the group
* @param options Array of options ["one","two",...
*/
function createRadioGroup(whereToAttach, groupname, options) {
var objDiv = document.getElementById(whereToAttach);
objDiv.innerHTML=""; // we clear it just in case
for (var i = 0, len = options.length; i < len; i++) {
objDiv.appendChild(createRadioButtonWithLabel(name, options[i], options[i]));
}
}
/**
* Get a group's selected node
* @param groupname Name of the group
* @return The radiobutton element that is checked, or null if none
*/
function getSelectedNode(groupname) {
var nodes = document.getElementById("radioDiv").childNodes;
for (var i = 0; i < nodes.length; i++) {
// nodes[i] is each label child of radioDiv
// we want its button to check if pressed
var radiobutton=nodes[i].firstChild;
if (radiobutton.checked) return radiobutton;
}
return null; // none selected
}
/**
* Creates a label with a radiobutton and a text node
* @param name Name of the group this radiobutton belongs to
* @param label Label for the radiobutton
* @param value Value for the radiobutton
*/
function createRadioButtonWithLabel(groupname, label, value) {
var objTextNode = document.createTextNode(label),
objLabel = document.createElement("label"),
objRadioButton = createRadioButton(groupname, value);
objLabel.appendChild(objRadioButton);
objLabel.appendChild(objTextNode);
return objLabel;
}
/**
* Creates a radio button
* @param groupname Name of the group this radiobutton belongs to
* @param value Value for the radiobutton
*/
function createRadioButton(groupname, value) {
var radioItem = document.createElement("input");
radioItem.type = "radio";
radioItem.name = groupname;
radioItem.value = value;
return radioItem;
}
//////////////////////////////////////////////////////////////////////
function createStuff() {
createRadioGroup("radioDiv", "coolMenu", ["Edit", "Delete", "Modify", "Modify a lot", "Have a beer", "Walk the dog", "f** my girlfriend"]);
}
function testStuff() {
var nodeSelected = getSelectedNode("coolMenu");
alert(nodeSelected.value);
}
</SCRIPT>
</HEAD>
<BODY>
<BUTTON onclick="createStuff()">Create Radio Buttons</BUTTON>
<BUTTON onclick="testStuff()">Alert</BUTTON>
<div id="radioDiv"></div>
</BODY>
</HTML>
但是,此代码不会给您选择的标签,而是第一个标签(您要求的是firstChild
)
如果您想使用动态构造的结构(顺便说一句,这相当复杂)确定选择了哪个收音机,您可以定义这个方便的函数:
function isRadioButtonPressed(number) {
return document.getElementById("rad"+number).checked;
}
因为您已将单选按钮命名为rad1
,rad2
因此,您可以:
var isEditSelected=isRadioButtonPressed(1); // will return true if edit is selected
var isDeleteSelected=isRadioButtonPressed(2); // will return true if delete is selected
一些建议:
- 您应该创建isRadioButtonPressed之类的实用函数,以避免使用firstchild、document.getElementById等反复编写长表达式。。。如您所见,编写简单的代码可能会变得非常复杂
- 您应该使用FireBug或Chrome/Safari开发者工具。如果您使用chrome,请转到“工具”菜单并选择“开发人员工具”。将出现一个窗口,您将看到代码中的错误。如果您对原始问题这样做,您将看到Chrome如何在
行中抱怨语法错误。如果您使用FireFox,下载Firebug插件也是一样的。这是开发网页的必要条件else()
function createRadioButton(id, name, value) {
var radioItem = document.createElement("input");
radioItem.type = "radio";
radioItem.name = name;
radioItem.id = id;
radioItem.value = value;
return radioItem;
}
看看你的createRadio现在有多酷:
function createRadio() {
var radioItem1=createRadioButton("rad1","radioGrp", "myradio1"),
radioItem2=createRadioButton("rad2","radioGrp", "myradio2");
.
.
}
这不是更容易阅读吗
希望有帮助:)(编辑)好的,看看这个!并尝试用这种技术对未来的问题进行编码:泛型、短函数和注释。祝你好运
<html>
<head>
<script>
/**
* Create a group of radiobuttons
* @param whereToAttach Div to attach generated things
* @param groupname Name for the group
* @param options Array of options ["one","two",...
*/
function createRadioGroup(whereToAttach, groupname, options) {
var objDiv = document.getElementById(whereToAttach);
objDiv.innerHTML=""; // we clear it just in case
for (var i = 0, len = options.length; i < len; i++) {
objDiv.appendChild(createRadioButtonWithLabel(name, options[i], options[i]));
}
}
/**
* Get a group's selected node
* @param groupname Name of the group
* @return The radiobutton element that is checked, or null if none
*/
function getSelectedNode(groupname) {
var nodes = document.getElementById("radioDiv").childNodes;
for (var i = 0; i < nodes.length; i++) {
// nodes[i] is each label child of radioDiv
// we want its button to check if pressed
var radiobutton=nodes[i].firstChild;
if (radiobutton.checked) return radiobutton;
}
return null; // none selected
}
/**
* Creates a label with a radiobutton and a text node
* @param name Name of the group this radiobutton belongs to
* @param label Label for the radiobutton
* @param value Value for the radiobutton
*/
function createRadioButtonWithLabel(groupname, label, value) {
var objTextNode = document.createTextNode(label),
objLabel = document.createElement("label"),
objRadioButton = createRadioButton(groupname, value);
objLabel.appendChild(objRadioButton);
objLabel.appendChild(objTextNode);
return objLabel;
}
/**
* Creates a radio button
* @param groupname Name of the group this radiobutton belongs to
* @param value Value for the radiobutton
*/
function createRadioButton(groupname, value) {
var radioItem = document.createElement("input");
radioItem.type = "radio";
radioItem.name = groupname;
radioItem.value = value;
return radioItem;
}
//////////////////////////////////////////////////////////////////////
function createStuff() {
createRadioGroup("radioDiv", "coolMenu", ["Edit", "Delete", "Modify", "Modify a lot", "Have a beer", "Walk the dog", "f** my girlfriend"]);
}
function testStuff() {
var nodeSelected = getSelectedNode("coolMenu");
alert(nodeSelected.value);
}
</SCRIPT>
</HEAD>
<BODY>
<BUTTON onclick="createStuff()">Create Radio Buttons</BUTTON>
<BUTTON onclick="testStuff()">Alert</BUTTON>
<div id="radioDiv"></div>
</BODY>
</HTML>
但是,此代码不会给您选择的标签,而是第一个标签(您要求的是firstChild
)
如果您想使用动态构造的结构(顺便说一句,这相当复杂)确定选择了哪个收音机,您可以定义这个方便的函数:
function isRadioButtonPressed(number) {
return document.getElementById("rad"+number).checked;
}
因为您已将单选按钮命名为rad1
,rad2
因此,您可以:
var isEditSelected=isRadioButtonPressed(1); // will return true if edit is selected
var isDeleteSelected=isRadioButtonPressed(2); // will return true if delete is selected
一些建议:
- 您应该创建isRadioButtonPressed之类的实用函数,以避免使用firstchild、document.getElementById等反复编写长表达式。。。如您所见,编写简单的代码可能会变得非常复杂
- 您应该使用FireBug或Chrome/Safari开发者工具。如果您使用chrome,请转到“工具”菜单并选择“开发人员工具”。将出现一个窗口,您将看到代码中的错误。如果您对原始问题这样做,您将看到Chrome如何在
行中抱怨语法错误。如果您使用FireFox,下载Firebug插件也是一样的。这是开发网页的必要条件else()
function createRadioButton(id, name, value) {
var radioItem = document.createElement("input");
radioItem.type = "radio";
radioItem.name = name;
radioItem.id = id;
radioItem.value = value;
return radioItem;
}
看看你的createRadio现在有多酷:
function createRadio() {
var radioItem1=createRadioButton("rad1","radioGrp", "myradio1"),
radioItem2=createRadioButton("rad2","radioGrp", "myradio2");
.
.
}
这不是更容易阅读吗
希望有帮助:)(编辑)好的,看看这个!并尝试用这种技术对未来的问题进行编码:泛型、短函数和注释。祝你好运
<html>
<head>
<script>
/**
* Create a group of radiobuttons
* @param whereToAttach Div to attach generated things
* @param groupname Name for the group
* @param options Array of options ["one","two",...
*/
function createRadioGroup(whereToAttach, groupname, options) {
var objDiv = document.getElementById(whereToAttach);
objDiv.innerHTML=""; // we clear it just in case
for (var i = 0, len = options.length; i < len; i++) {
objDiv.appendChild(createRadioButtonWithLabel(name, options[i], options[i]));
}
}
/**
* Get a group's selected node
* @param groupname Name of the group
* @return The radiobutton element that is checked, or null if none
*/
function getSelectedNode(groupname) {
var nodes = document.getElementById("radioDiv").childNodes;
for (var i = 0; i < nodes.length; i++) {
// nodes[i] is each label child of radioDiv
// we want its button to check if pressed
var radiobutton=nodes[i].firstChild;
if (radiobutton.checked) return radiobutton;
}
return null; // none selected
}
/**
* Creates a label with a radiobutton and a text node
* @param name Name of the group this radiobutton belongs to
* @param label Label for the radiobutton
* @param value Value for the radiobutton
*/
function createRadioButtonWithLabel(groupname, label, value) {
var objTextNode = document.createTextNode(label),
objLabel = document.createElement("label"),
objRadioButton = createRadioButton(groupname, value);
objLabel.appendChild(objRadioButton);
objLabel.appendChild(objTextNode);
return objLabel;
}
/**
* Creates a radio button
* @param groupname Name of the group this radiobutton belongs to
* @param value Value for the radiobutton
*/
function createRadioButton(groupname, value) {
var radioItem = document.createElement("input");
radioItem.type = "radio";
radioItem.name = groupname;
radioItem.value = value;
return radioItem;
}
//////////////////////////////////////////////////////////////////////
function createStuff() {
createRadioGroup("radioDiv", "coolMenu", ["Edit", "Delete", "Modify", "Modify a lot", "Have a beer", "Walk the dog", "f** my girlfriend"]);
}
function testStuff() {
var nodeSelected = getSelectedNode("coolMenu");
alert(nodeSelected.value);
}
</SCRIPT>
</HEAD>
<BODY>
<BUTTON onclick="createStuff()">Create Radio Buttons</BUTTON>
<BUTTON onclick="testStuff()">Alert</BUTTON>
<div id="radioDiv"></div>
</BODY>
</HTML>
但是,此代码不会给您选择的标签,而是第一个标签(您要求的是firstChild
)
如果您想使用动态构造的结构(顺便说一句,这相当复杂)确定选择了哪个收音机,您可以定义这个方便的函数:
function isRadioButtonPressed(number) {
return document.getElementById("rad"+number).checked;
}
因为您已将单选按钮命名为rad1
,rad2
因此,您可以:
var isEditSelected=isRadioButtonPressed(1); // will return true if edit is selected
var isDeleteSelected=isRadioButtonPressed(2); // will return true if delete is selected
一些建议:
- 您应该创建isRadioButtonPressed之类的实用函数,以避免使用firstchild、document.getElementById等反复编写长表达式。。。如您所见,编写简单的代码可能会变得非常复杂
- 您应该使用FireBug或Chrome/Safari开发者工具。如果您使用chrome,请转到“到”