从条件javascript函数返回一个自定义对话框

returning a custom dialog box from a conditional javascript function

本文关键字：一个 自定义 对话框 条件 javascript 函数 返回      更新时间：2023-09-26

这是我的javascript函数，用于检查上传的文件是否为图像格式类型1 !目前我使用了默认的警告框来返回错误消息!

 var _validFileExtensions = [".jpg", ".jpeg", ".bmp", ".gif", ".png"];    
function Validate(oForm) {
    var arrInputs = oForm.getElementsByTagName("input");
    for (var i = 0; i < arrInputs.length; i++) {
        var oInput = arrInputs[i];
        if (oInput.type == "file") {
            var sFileName = oInput.value;
            if (sFileName.length > 0) {
                var blnValid = false;
                for (var j = 0; j < _validFileExtensions.length; j++) {
                    var sCurExtension = _validFileExtensions[j];
                    if (sFileName.substr(sFileName.length - sCurExtension.length, sCurExtension.length).toLowerCase() == sCurExtension.toLowerCase()) {
                        blnValid = true;
                        break;
                    }
                }
                if (!blnValid) {
                    alert("Sorry a dig copy may be in a different file format! Formats allowed are " + _validFileExtensions.join(", "));
                    return false;
                }
            }
        }
    }
    return true;
}

下面的代码给出了一个我想调用的自定义对话框，而不是默认的

框
<style>
            #white-background{
                display: none;
                width: 100%;
                height: 100%;
                position: fixed;
                top: 0px;
                left: 0px;
                background-color: #fefefe;
                opacity: 0.7;
                z-index: 9999;
            }
            #dlgbox{
                /*initially dialog box is hidden*/
                display: none;
                position: fixed;
                width: 480px;
                z-index: 9999;
                border-radius: 10px;
                background-color: #7c7d7e;
            }
            #dlg-header{
                background-color:aliceblue;
                color: white;
                font-size: 20px;
                padding: 10px;
                margin: 10px 10px 0px 10px;
            }
            #dlg-body{
                background-color: white;
                color: black;
                font-size: 14px;
                padding: 10px;
                margin: 0px 10px 0px 10px;
            }
            #dlg-footer{
                background-color: #f2f2f2;
                text-align: right;
                padding: 10px;
                margin: 0px 10px 10px 10px;
            }
            #dlg-footer button{
                background-color: grey;
                color: white;
                padding: 5px;
                border: 0px;
            }
        </style>
    </head>
    <body>
        <!-- dialog box -->
        <div id="white-background">
        </div>
        <div id="dlgbox">
            <div id="dlg-header"></div>
            <div id="dlg-body">Sorry a dig copy may be in a different file format! Formats allowed are ".jpg", ".jpeg", ".bmp", ".gif", ".png"</div>
            <div id="dlg-footer">
                <button onclick="dlgLogin()">Ok</button>
            </div>
        </div>
        <!-- rest of the page -->
        <h1>Dialog Box Demo</h1>
        <p>This is a dialog box example.</p>
        <p>Feel free to experiment with the code.</p>
        <p>Click the button below to see the dialog box.</p>
        <button onclick="showDialog()">Click Me!</button>
        <!-- script of dialog -->
        <script>
            function dlgLogin(){
                var whitebg = document.getElementById("white-background");
                var dlg = document.getElementById("dlgbox");
                whitebg.style.display = "none";
                dlg.style.display = "none";
            }
            function showDialog(){
                var whitebg = document.getElementById("white-background");
                var dlg = document.getElementById("dlgbox");
                whitebg.style.display = "block";
                dlg.style.display = "block";
                var winWidth = window.innerWidth;
                var winHeight = window.innerHeight;
                dlg.style.left = (winWidth/2) - 480/2 + "px";
                dlg.style.top = "150px";
            }
        </script>

请帮助我将第二个代码集成到第一个代码中，以便我可以返回自定义对话框，而不是默认的警报框

你可以在这里找到你的答案如何改变警告框的样式

The alert box is a system object, and not subject to CSS. To do this style of thing you would need to create an HTML element and mimic the alert() functionality. The jQuery UI Modal box does a lot of the work for you, working basically as I have described: Link.
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