JavaScript 对话框返回答案

【问题标题】：JavaScript dialog returnJavaScript 对话框返回
【发布时间】：2011-01-22 11:37:11
【问题描述】：

我有一个绘制对话框的 JavaScript 函数。我想让它返回用户指定的值。问题是，当用户单击两个按钮时关闭对话框，这两个按钮分配了onClick 事件。我知道获取这些事件的唯一方法是为它们分配函数，这意味着返回会导致分配的函数返回，而不是我的 inputDialog 函数。我确定我只是在以一种愚蠢的方式这样做。

如果您想知道，此脚本使用 Adobe 的 ExtendScript API 来扩展 After Effects。

代码如下：

function inputDialog (queryString, title){
    // Create a window of type dialog.
    var dia = new Window("dialog", title, [100,100,330,200]);  // bounds = [left, top, right, bottom]
    this.windowRef = dia;

    // Add the components, a label, two buttons and input
    dia.label = dia.add("statictext", [20, 10, 210, 30]);
    dia.label.text = queryString;
    dia.input = dia.add("edittext", [20, 30, 210, 50]);
    dia.input.textselection = "New Selection";
    dia.input.active = true;
    dia.okBtn = dia.add("button", [20,65,105,85], "OK");
    dia.cancelBtn = dia.add("button", [120, 65, 210, 85], "Cancel");


    // Register event listeners that define the button behavior

    //user clicked OK
    dia.okBtn.onClick = function() {
        if(dia.input.text != "") { //check that the text input wasn't empty
            var result = dia.input.text;
            dia.close(); //close the window
            if(debug) alert(result);
            return result;
        } else { //the text box is blank
            alert("Please enter a value."); //don't close the window, ask the user to enter something
        }
    };

    //user clicked Cancel
    dia.cancelBtn.onClick = function() {
        dia.close();
        if(debug) alert("dialog cancelled");
        return false;
    };

    // Display the window
    dia.show();

}

【问题讨论】：

标签： javascript function return-value extendscript adobe-scriptui

【解决方案1】：

我想出了一个解决方案。这真的很难看，但它会让我暂时渡过难关......谁有更好的解决方案？

    var ret = null;

    // Register event listeners that define the button behavior
    dia.okBtn.onClick = function() {
        if(dia.input.text != "") { //check that the text input wasn't empty
            var result = dia.input.text;
            dia.close(); //close the window
            if(debug) alert(result);
            ret = result;
            return result;
        } else { //the text box is blank
            alert("Please enter a value."); //don't close the window, ask the user to enter something
        }
    };

    dia.cancelBtn.onClick = function() { //user cancelled action
        dia.close();
        ret = false;
        return false;
    };

    // Display the window
    dia.show();

    while(ret == null){};
    return ret;

【讨论】：

【解决方案2】：

使用特定整数关闭对话框可能会稍微好一些。然后您可以检查来自show() 的返回值并返回适当的值。请参阅 jongware 对ExtendScript ScriptUI Window's close method 的引用。

// Register event listeners that define the button behavior
dia.okBtn.onClick = function() {
    if(dia.input.text != "") { //check that the text input wasn't empty
        dia.close(1); //close the window
    } else { //the text box is blank
        alert("Please enter a value."); //don't close the window, ask the user to enter something
    }
};

dia.cancelBtn.onClick = function() { //user cancelled action
    dia.close(2);
};


var buttonCloseValue = dia.show(); //blocks until user interaction
if(dia.show() == 1) {
    if(debug) alert(dia.input.text);
    return dia.input.text;
}
return false;

【讨论】：