我试图实现一个功能到我的复选框问题,其中只有3复选框可以进行检查。但是,它仍然会继续检查超越极限(3)。
我敢肯定它是与latestcheck.checked = FALSE;
我的打字稿功能:
factors(whichlist, maxchecked, latestcheck) {
// An array containing the id of each checkbox to monitor.
var listone = new Array("teamStrength", "marketOp", "productOff", "technology", "financialPerform", "coinvestors", "mediaExpo", "awardsWon", "portfolioFit");
// End of customization.
var iterationlist;
eval("iterationlist=" + whichlist);
var count = 0;
for (var i = 0; i < iterationlist.length; i++) {
if ((<HTMLInputElement>document.getElementById(iterationlist[i])).checked == true) {
count++;
}
if (count > maxchecked) {
latestcheck.checked = false;
console.log("last checked: " + latestcheck.checked);
}
}
if (count > maxchecked) {
alert('Sorry, only ' + maxchecked + ' may be checked.');
}
}
需要采取什么是该警示弹出后,我检查了复选框(3极限之后,所以第四个检查框),将取消选中。
你能不能做到这一点? (我不这样做打字稿)
const listOne = ["teamStrength", "marketOp", "productOff", "technology", "financialPerform", "coinvestors", "mediaExpo", "awardsWon", "portfolioFit"];
const container = document.getElementById("checkboxContainer");
container.addEventListener("click",function(e) {
if (listOne.indexOf(e.target.id) !=-1) { // may not even be needed
if (container.querySelectorAll("input[type=checkbox]:checked").length > 3) {
e.preventDefault(); // or this.checked=false;
}
}
});
简化:
document.querySelectorAll(".question").forEach(function(q) {
q.addEventListener("click", function(e) {
var len = this.querySelectorAll("input[type=checkbox]:checked").length;
if (len > 3) {
e.preventDefault();
}
});
});
<div class="question">
<input type="checkbox" />
<input type="checkbox" />
<input type="checkbox" />
<input type="checkbox" />
<input type="checkbox" />
</div>
<div class="question">
<input type="checkbox" />
<input type="checkbox" />
<input type="checkbox" />
<input type="checkbox" />
<input type="checkbox" />
</div>