场景:用户通过 HTML 表单投票选择乘坐公共(public)汽车进行实地考察。共有三个选项:
<select id="selectbox">
<option>Berlin</option>
<option>Munich</option>
<option>Cologne</option>
</select>
免费巴士座位存储在数据库中/从数据库中读取:($tour 是我们保存免费座位的数组)
<table class="status">
<tr><td>Berlin: <span id="t1">available (<?php echo $tour[0]; ?> seats)</span></td></tr>
<tr><td>Munich: <span id="t2">available (<?php echo $tour[1]; ?> seats)</span></td></tr>
<tr><td>Cologne: <span id="t3">available (<?php echo $tour[2]; ?> seats)</span></td></tr>
</table>
如果免费座位为零,我们会使用普通 JavaScript 显示“抱歉,已订满”信息:
// get content of status table
var t1 = document.getElementById("t1").innerHTML;
var t2 = document.getElementById("t2").innerHTML;
var t3 = document.getElementById("t3").innerHTML;
var bookedout = "sorry, booked out!"
// check if condition is met
if (t1 == "available (0 seats)") {
document.getElementById("t1").innerHTML = bookedout;
}
if (t2 == "available (0 seats)") {
document.getElementById("t2").innerHTML = bookedout ;
}
if (t3 == "available (0 seats)") {
document.getElementById("t3").innerHTML = bookedout ;
}
工作正常。但是,现在我有点迷路了。上述条件还应从#selectbox based on the option's innerHTML 中删除相应的选项。在 jQuery 中,我会使用类似#selectbox option:contains('stringhere') 的东西。
但是,我想用最纯粹的 JavaScript 来完成。有什么想法吗?
最佳答案
这很简单..
首先在您的 html
中为您的选项赋值:
<select id="selectbox">
<option>Berlin</option>
<option>Munich</option>
<option>Cologne</option>
</select>
然后在js中:
var mySelect = document.getElementById("selectbox");
//function to get option values as array
function getOptionsArr() {
var optionsArray =[],options = mySelect.options;
var i = 0, len = options.length;
// store the options value in an array
while (i < len)
{
optionsArray.push(options[i++].value);
}
return optionsArray;
}
var t1 = document.getElementById("t1").innerHTML;
var t2 = document.getElementById("t2").innerHTML;
var t3 = document.getElementById("t3").innerHTML;
var bookedout = "sorry, booked out!"
// check if condition is met
if (t1 == "available (0 seats)"){
document.getElementById("t1").innerHTML = bookedout;
//this will get the whole parent node and child node inner text we split at : and get the value
var textArr = document.getElementById("t1").parentElement.innerText.split(':');
// find the index of value from our array created above and remove that option from select
mySelect.remove(getOptionsArr().indexOf(textArr [0]))
}
//repeat the same for other
if (t2 == "available (0 seats)"){
document.getElementById("t2").innerHTML = bookedout ;
var textArr = document.getElementById("t2").parentElement.innerText.split(':');
mySelect.remove(getOptionsArr().indexOf(textArr [0]))
}
if (t3 == "available (0 seats)"){
document.getElementById("t3").innerHTML = bookedout ;
var textArr = document.getElementById("t3").parentElement.innerText.split(':');
mySelect.remove(getOptionsArr().indexOf(textArr [0]))
}
另外你可以重构它
var mySelect = document.getElementById("selectbox");
//function to get option values as array
function getOptionsArr() {
var optionsArray =[],options = mySelect.options;
var i = 0, len = options.length;
// store the options value in an array
while (i < len)
{
optionsArray.push(options[i++].value);
}
return optionsArray;
}
var t1 = document.getElementById("t1").innerHTML;
var t2 = document.getElementById("t2").innerHTML;
var t3 = document.getElementById("t3").innerHTML;
var bookedout = "sorry, booked out!"
// check if condition is met
if (t1 == "available (0 seats)"){
doUpdateDOM("t1")
}
if (t2 == "available (0 seats)"){
doUpdateDOM("t2")
}
if (t3 == "available (0 seats)"){
doUpdateDOM("t3")
}
function doUpdateDOM(nodeID){
document.getElementById(nodeID).innerHTML = bookedout;
var textArr = document.getElementById(nodeID).parentElement.innerText.split(':');
mySelect.remove(optionsArray.indexOf(textArr [0]))
}
关于javascript - 使用纯 JavaScript 禁用基于 innerhtml 的选择选项,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/39200509/