javascript中出现警报后如何停止重新加载页面

本文介绍了javascript中出现警报后如何停止重新加载页面的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 问题描述

当我不选择类别并单击提交按钮时，我想停止重新加载页面.有人可以帮我吗?

i want to stop reloading page when i don't choose category and click on submit button. can anybody help me?

function check() { var select = document.getElementById("category").value; if (select == -1) { return alert("You didn't choose category !!!"); } }

<form action="#" method="POST" id="form" name="form"> <select name="category" id="category"> <option value="-1">Select category</option> <option value="1">News</option> <option value="2">Sport</option> <option value="3">World</option> <option value="4">Music</option> </select> <input type="submit" value="submit" id="submit" name="submit" onclick="check();" /> </form>

推荐答案

您需要从函数中返回 false ，以防止表单被提交.

You need to return false from the function to prevent the form from beeing submitted.

<input type="submit" value="submit" id="submit" name="submit" onclick="return check();" /> function check() { var select = document.getElementById("category").value; if (select == -1) { alert("You didn't choose category !!!"); return false; } }