我要做一个按钮，采取行动并将数据保存到数据库中。
一旦用户单击按钮，我希望JavaScript警报提供“是”和“取消”选项。如果用户选择“是”，数据将被插入数据库，否则将不采取任何操作。
如何显示这样的对话框？
当前回答
点击前询问的最简单方法如下
<a onclick="return askyesno('Delete this record?');" href="example.php?act=del&del_cs_id=<?php echo $oid; ?>">
<button class="btn btn-md btn-danger">Delete </button>
</a>
其他回答
一个普通的JavaScript选项，带有一个用于创建自定义模式对话框的类，该对话框包含一个文本框：
jsfiddle：
https://jsfiddle.net/craigdude/uh82mjtb/2/
html格式：
<!DOCTYPE html>
<html>
<style>
.modal_dialog
{
box-sizing: border-box;
background-color: #ededed;
border-radius: 5px;
border: 0.5px solid #ccc;
font-family: sans-serif;
left: 30%;
margin-left: -50px;
padding: 15px 10px 10px 5px;
position: fixed;
text-align: center;
width: 320px;
}
</style>
<script src="./CustomModalDialog.js"></script>
<script>
var gCustomModalDialog = null;
/** this could be static html from the page in an "invisible" state */
function generateDynamicCustomDialogHtml(){
var html = "";
html += '<div id="custom_modal_dialog" class="modal_dialog">';
html += 'Name: <input id="name" placeholder="Name"></input><br><br>';
html += '<button id="okay_button">OK</button>';
html += '<button id="cancel_button">Cancel</button>';
html += '</div>';
return html;
}
function onModalDialogOkayPressed(event) {
var name = document.getElementById("name");
alert("Name entered: "+name.value);
}
function onModalDialogCancelPressed(event) {
gCustomModalDialog.hide();
}
function setupCustomModalDialog() {
var html = generateDynamicCustomDialogHtml();
gCustomModalDialog = new CustomModalDialog(html, "okay_button", "cancel_button",
"modal_position", onModalDialogOkayPressed, onModalDialogCancelPressed);
}
function showCustomModalDialog() {
if (! gCustomModalDialog) {
setupCustomModalDialog();
}
gCustomModalDialog.show();
gCustomModalDialog.setFocus("name");
}
</script>
<body>
<button onclick="showCustomModalDialog(this)">Show Dialog</button><br>
Some content
<div id="modal_position">
</div>
Some additional content
</body>
</html>
自定义模式对话框.js：
/** Encapsulates a custom modal dialog in pure JS
*/
class CustomModalDialog {
/**
* Constructs the modal content
* @param htmlContent - content of the HTML dialog to show
* @param okayControlElementId - elementId of the okay button, image or control
* @param cancelControlElementId - elementId of the cancel button, image or control
* @param insertionElementId - elementId of the <div> or whatever tag to
* insert the html at within the document
* @param callbackOnOkay - method to invoke when the okay button or control is clicked.
* @param callbackOnCancel - method to invoke when the cancel button or control is clicked.
* @param callbackTag (optional) - to allow object to be passed to the callbackOnOkay
* or callbackOnCancel methods when they're invoked.
*/
constructor(htmlContent, okayControlElementId, cancelControlElementId, insertionElementId,
callbackOnOkay, callbackOnCancel, callbackTag) {
this.htmlContent = htmlContent;
this.okayControlElementId = okayControlElementId;
this.cancelControlElementId = cancelControlElementId;
this.insertionElementId = insertionElementId;
this.callbackOnOkay = callbackOnOkay;
this.callbackOnCancel = callbackOnCancel;
this.callbackTag = callbackTag;
}
/** shows the custom modal dialog */
show() {
// must insert the HTML into the page before searching for ok/cancel buttons
var insertPoint = document.getElementById(this.insertionElementId);
insertPoint.innerHTML = this.htmlContent;
var okayControl = document.getElementById(this.okayControlElementId);
var cancelControl = document.getElementById(this.cancelControlElementId);
okayControl.addEventListener('click', event => {
this.callbackOnOkay(event, insertPoint, this.callbackTag);
});
cancelControl.addEventListener('click', event => {
this.callbackOnCancel(event, insertPoint, this.callbackTag);
});
} // end: method
/** hide the custom modal dialog */
hide() {
var insertPoint = document.getElementById(this.insertionElementId);
var okayControl = document.getElementById(this.okayControlElementId);
var cancelControl = document.getElementById(this.cancelControlElementId);
insertPoint.innerHTML = "";
okayControl.removeEventListener('click',
this.callbackOnOkay,
false
);
cancelControl.removeEventListener('click',
this.callbackOnCancel,
false
);
} // end: method
/** sets the focus to given element id
*/
setFocus(elementId) {
var focusElement = document.getElementById(elementId);
focusElement.focus();
if (typeof focusElementstr === "HTMLInputElement")
focusElement.select();
}
} // end: class
如何使用“inline”JavaScript执行此操作：
<form action="http://www.google.com/search">
<input type="text" name="q" />
<input type="submit" value="Go"
onclick="return confirm('Are you sure you want to search Google?')"
/>
</form>
与其他解决方案不同的另一个解决方案是使用新的对话框元素。您需要使用基于与其他元素交互的show或showModal方法。close方法可用于关闭打开的对话框。
<dialog>
<button class="yes">Yes</button>
<button class="no">No</button>
</dialog>
const dialogEl=document.querySelector（“对话框”）；const openDialog=document.querySelector（“button.open dialog”）；const yesBtn=document.querySelector（“.yes”）；const noBtn=document.querySelector（“.no”）；const result=document.querySelector（“.result”）；openDialog.addEventListener（“单击”，（）=>{dialogEl.showModal（）；});yesBtn.addEventListener（“单击”，（）=>{//以下行可以由您的DB查询替换result.textContent=“这可能是您的DB查询”；dialogEl.close（）；});noBtn.addEventListener（“单击”，（）=>{result.textContent=“”；dialogEl.close（）；});@导入url（'https://fonts.googleapis.com/css2?family=Roboto:wght@300&display=swap'）；正文{字体系列：“Roboto”；}按钮{背景：hsl（206deg 64%51%）；颜色：白色；衬垫：0.5em 1em；边框：0无；光标：指针；}对话框{边框：0无；}.结果{页边距：1em；}<对话框><button class=“yes”>是</button><button class=“no”>否</button></dialog><button class=“open dialog”>单击我</button><div class=“result”></div>
我可以使用吗？
目前，与所有现代浏览器的兼容性都很好。
xdialog提供了一个简单的API xdialog.conf（）。代码片段如下。更多演示可在此处找到
document.getElementById（'test'）.addEventListener（'click'，test）；函数测试（）{xdialog.conf（'确定吗？'，function（）{//如果选择“确定”/“是”，请在此处工作。。。console.info（'Done！'）；}, {style:'宽度：420px；字体大小：0.8rem；'，按钮：{ok：'是文本'，cancel:'无文本'},oncancel:function（）{console.warn（'已取消！'）；}});}<link href=“https://cdn.jsdelivr.net/gh/xxjapp/xdialog@3/xdialog.min.css“rel=”stylesheet“/><script src=“https://cdn.jsdelivr.net/gh/xxjapp/xdialog@3/xdialog.min.js“></script><button id=“test”>测试</button>
您可以使用JavaScript拦截onSubmit事件。
然后调用确认警报，然后获取结果。
