[英]Need help creating a button to activate a javascript function
這是我的腳本,我嘗試使按鈕隨機化圖像,而不必按下刷新按鈕。 我到底需要對按鈕進行編碼才能使其正常工作? 我的代碼對函數名是什么感到困惑? 我在創建此控件方面有很多幫助,因此對於該按鈕,我有點迷失了。 我創建了一個按鈕,並嘗試為“ onclick”插入多個內容,但沒有任何效果。
<!doctype html>
<html>
<head>
<SCRIPT LANGUAGE="JavaScript">
var theImages = new Array()
theImages[0] = '<img class="atvi-image-image" alt=""src="/content/dam/atvi/callofduty/blackops2/cod-bo2/dlc/mdlc-calling-card-flags.png" title="" height="467" width="675">'
theImages[1] = '<img class="atvi-image-image" alt="" src="/content/dam/atvi/callofduty/blackops2/cod-bo2/dlc/mdlc-nuketown-zombies.png" title="" height="732" width="1084">'
theImages[2] = '<img class="atvi-image-image" alt="" src="/content/dam/atvi/callofduty/blackops2/cod-bo2/dlc/mdlc-extra-slots.png" title="" height="480" width="752">'
theImages[3] = '<img class="atvi-image-image" alt="" src="/content/dam/atvi/callofduty/blackops2/cod-bo2/dlc/mdlc-nuketown-2025.png" title="" height="412" width="683">'
var j = 0
var p = theImages.length;
var preBuffer = new Array()
for (i = 0; i < p; i++){
preBuffer[i] = new Image()
preBuffer[i].src = theImages[i]
}
var whichImage = Math.round(Math.random()*(p-1));
(function () {
var theImages = [{
src: "winry doe.gif",
width: "480",
height: "270"
}, {
src: "WINRY WINK.gif",
width: "500",
height: "484"
}, {
src: "winry getting hugged.gif",
width: "500",
height: "205"
},
{
src: "winry getting mad.gif",
width: "500",
height: "292"
}];
var preBuffer = [];
for (var i = 0, j = theImages.length; i < j; i++) {
preBuffer[i] = new Image();
preBuffer[i].src = theImages[i].src;
preBuffer[i].width = theImages[i].width;
preBuffer[i].height = theImages[i].height;
}
function getRandomInt(min, max) {
return Math.floor(Math.random() * (max - min + 1)) + min;
}
window.getRandomImage = function () {
var whichImage = getRandomInt(0, preBuffer.length - 1);
return preBuffer[whichImage];
}
})();
window.onload = function () {
var newImage = getRandomImage();
console.log(newImage);
document.body.appendChild(newImage);
};
</script>
</head>
<body>
<SCRIPT LANGUAGE="JavaScript">
showImage();
</script>
<form>
<input type="button" value="More Winry" onclick="">
</form>
</body>
</html>
只需添加:
function randomImage() {
var newImage = getRandomImage();
console.log(newImage);
document.body.appendChild(newImage);
};
並在按鈕上單擊添加:
<input type="button" value="More Winry" onclick="randomImage()">
編輯替換現有圖像:
function randomImage() {
var newImage = getRandomImage();
console.log(newImage);
var img = document.getElementsByTagName('img').remove();
document.body.appendChild(newImage);
};
Element.prototype.remove = function() {
this.parentElement.removeChild(this);
}
NodeList.prototype.remove = HTMLCollection.prototype.remove = function() {
for(var i = 0, len = this.length; i < len; i++) {
if(this[i] && this[i].parentElement) {
this[i].parentElement.removeChild(this[i]);
}
}
}
添加這些功能。
另外,函數中不需要JQuery,因此JQuery標記無用。
您也可以使用與此類似的內容(只要img具有該類)。 使用Edan Feiles回答所描述的原型方法
按鈕html:
<form>
<input id="imageButton" type="button" value="More Winry" />
</form>
和JS:
var button = document.getElementById("imageButton");
button.onclick = function() {
var newImage = getRandomImage();
console.log(newImage);
document.getElementsByClassName("atvi-image-image").remove();
document.body.appendChild(newImage);
};
或者您也可以使用Edan Feiles所說的話,並將以下行添加到函數中:
document.getElementsByClassName("atvi-image-image").remove();
在添加新的隨機圖片之前。
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