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

我目前正在开发一个web工作流,它已经有了自己的通知/对话框,我最近(比如今天)创建了一个小型的自定义(并根据项目需要定制)是/否对话框。

所有对话框都显示在模态图层上。需要用户充分注意。

我以这种方式定义选项配置。此选项用于定义按钮文本,以及单击时与每个按钮关联的值:

optionsConfig = [
   { text: 'Yes', value: true },
   { text: 'No', value: false }
]

函数的用法如下:

const answer = await notifier.showDialog('choose an option', options.config);
if (answer) {
   // 'Yes' was clicked
} else {
   // 'No' was clicked!
}

我所做的只是为每个选项创建一个异步事件处理程序,这意味着每个按钮都有一个简单的处理程序。每个处理程序都返回选项的值。处理程序被推入数组中。然后将数组传递给Promise.rece,这是showDialog方法的返回值,它将对应于值的实际值(由处理程序返回的值)。

无法提供太多代码。正如我所说,这是一个非常具体的案例,但这个想法可能对其他实现有用。大约二十行代码。

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

另一种方法是:

$("input[name='savedata']").click(function(e){
       var r = confirm("Are you sure you want to save now?");

       //cancel clicked : stop button default action 
       if (r === false) {
           return false;
        }

        //action continues, saves in database, no need for more code


   });

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。

var answer = window.confirm("Save data?");
if (answer) {
    //some code
}
else {
    //some code
}

使用window.conf而不是alert。这是实现该功能的最简单方法。

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>