HTML object: introduction to some object properties of html
The content of this article is about HTML objects: an introduction to some object attributes of html, which has certain reference value. Friends in need can refer to it. I hope it will be helpful to you.
Form object
Form object method
reset(): Resets all input elements of the form to their default values.
submit(): Submit the form.
Text object
Text object property
disabled: Sets or returns whether the text field should be disabled.
readOnly: Sets or returns whether the text field should be read-only.
value: Set or return the value of the value attribute of the text field.
Text object method
focus(): Set focus on the text field.
Example
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title></title>
</head>
<body>
<form>
<input name = "wd" />
<input type="submit" value="百度一下" onclick="sub()">
</form>
<script>
var form = document.getElementsByTagName("form")[0];
var text = document.getElementsByName("wd")[0];
text.focus();
function sub(){
var text = document.getElementsByName("wd")[0];
// text.value = "魔道";
// text.readOnly = "true";
// console.log(text.readOnly);
// text.disabled = "true";
console.log(text.disabled);
text.focus();
}
//type为text、password、textarea的标签均有value、focus、disabled、readOnly
</script>
</body>
</html>Radio object
Radio object property
checked: Sets or returns the status of the radio button.
disabled: Sets or returns whether the radio button is disabled.
value: Sets or returns the value of the radio button's value attribute.
Checkbox object
Checkbox object property
checked: Sets or returns whether the checkbox should be checked.
disabled : Sets or returns whether the checkbox should be disabled.
value: Set or return the value of the value attribute of the checkbox
Select object
Select object collection
options[]: Returns an array containing all options in the drop-down list.
Select object property
disabled: Sets or returns whether the drop-down list should be disabled.
length: Returns the number of options in the drop-down list.
selectedIndex: Set or return the index number of the selected item in the drop-down list.
Select object method
add(): Add an option to the drop-down list.
remove(): Remove an option from the drop-down list.
Option object
Option object construction method
Option(text,value): Create an Option object through text and value values
Option Object Attribute
selected: Set or return the value of the selected attribute.
text: Sets or returns the plain text value of an option.
value: Set or return the value sent to the server.
Select object and Option object example
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title></title>
</head>
<body>
<select id="grade">
<option value="1">一年级</option>
<option value="2">二年级</option>
<option value="3">三年级</option>
<option value="4">四年级</option>
</select>
<input type="button" onclick="text()" value="按钮" />
<script type="text/javascript">
function text(){
var select = document.getElementById("grade");
console.log(select.disabled);
console.log(select.length);
console.log(select.selectedIndex);
console.log("~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~`")
var options = select.options;
console.log(options[select.selectedIndex].value);
console.log("@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@")
for(var i=0;i<options.length;i++){
console.log(options[i].value);
console.log(options[i].selected);
console.log(options[i].text);
}
var option = new Option("五年级","5");
select.add(option);
select.remove(0);
}
</script>
</body>
</html>Registry
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title></title>
</head>
<body>
<span style="color:red;" id="wrong-massage"></span><br />
<form onsubmit="return check()">
<table>
<tr>
<td>用户名：</td>
<td><input id="name" placeholder="请输入用户名" onblur="check_name()" ></td>
</tr>
<tr>
<td>密码：</td>
<td><input id="pw" type="password" placeholder="请输入密码" onblur="check_pw()"></td>
</tr>
<tr>
<td>确认密码：</td>
<td><input id="pw-check" type="password" placeholder="请输入确认密码"/></td>
</tr>
</table>
<input type="radio" name="sex" value="0"/>男
<input type="radio" name="sex" value="1"/>女
<br />
<input type="checkbox" name="hobby" value="0"/>羽毛球
<input type="checkbox" name="hobby" value="1"/>篮球
<input type="checkbox" name="hobby" value="2"/>乒乓球
<input type="checkbox" name="hobby" value="3"/>足球
<br />
<select id="grade">
<option value="1">大一</option>
<option value="2">大二</option>
<option value="3">大三</option>
<option value="4">大四</option>
</select>
<br />
<td><input type="reset" value="重置" /></td>
<td><input type="submit" value="注册"/></td>
</form>
<script>
//使用$()函数可节省代码量
function $(id){
return document.getElementById(id);
}
function check(){
var n = document.getElementById("name");
var w = document.getElementById("pw");
var msg = document.getElementById("wrong-massage");
var c = document.getElementById("pw-check");
if(n.value.length>12){
msg.innerHTML = "用户名不能超过15个字符，请重新输入！";
n.focus();
return false;
}
if(n.value.length==0){
msg.innerHTML = "用户名不能为空，请重新输入！";
n.focus();
return false;
}
if(w.value.length>12){
msg.innerHTML = "密码不能超过12个字符，请重新输入！";
w.focus();
return false;
}
if(w.value.length==0){
msg.innerHTML = "密码不能为空，请重新输入！";
w.focus();
return false;
}
if(w.value!=c.value){
msg.innerHTML = "密码错误，请重新输入！";
c.focus();
return false;
}
var sex = document.getElementsByName("sex");
var hobby = document.getElementsByName("hobby");
for(var i=0;i<sex.length;i++){
sex[i].disabled=true;
console.log(sex[i].checked+" "+sex[i].value);
}
console.log("~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~")
for(var i=0;i<hobby.length;i++){
hobby[i].checked = true;
console.log(hobby[i].checked+" "+hobby[i].value);
}
console.log("~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~")
var select = document.getElementById("grade");
var options = select.options;
console.log(select.length);
console.log(select.selectedIndex);
console.log(options[select.selectedIndex].value);
for(var i=0;i<options.length;i++){
var option = options[i];
console.log(option.value)
select.disabled = true;
}
return false;
}
function check_name(){
var n = document.getElementById("name");
var msg = document.getElementById("wrong-massage");
if(n.value.length>12){
msg.innerHTML = "用户名不能超过15个字符，请重新输入！";
n.value = "";
n.focus();
}
else if(n.value.length==0){
msg.innerHTML = "用户名不能为空，请重新输入！";
n.focus();
}
else{
msg.innerHTML = " ";
}
}
function check_pw(){
var w = document.getElementById("pw");
var msg = document.getElementById("wrong-massage");
if(w.value.length>12){
msg.innerHTML = "密码不能超过12个字符，请重新输入！";
w.value = "";
w.focus();
}
else if(w.value.length==0){
msg.innerHTML = "密码不匹配，请重新输入！";
w.focus();
}
else
{
msg.innerHTML = " ";
}
}
</script>
</body>
</html>Image object
Image object properties
src: Set or return the URL of the image.
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