本文整理汇总了TypeScript中d3.event.preventDefault方法的典型用法代码示例。如果您正苦于以下问题：TypeScript event.preventDefault方法的具体用法？TypeScript event.preventDefault怎么用？TypeScript event.preventDefault使用的例子？那么恭喜您, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类d3.event的用法示例。
在下文中一共展示了event.preventDefault方法的2个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的TypeScript代码示例。
示例1: svgKeyDown
svgKeyDown() {
const view = this;
const state = this.state;
const showSelectionFrontierNodes = (inEdges: boolean, filter: (e: Edge, i: number) => boolean, doSelect: boolean) => {
const frontier = view.getNodeFrontier(state.selection, inEdges, filter);
if (frontier != undefined && frontier.size) {
if (doSelect) {
if (!d3.event.shiftKey) {
state.selection.clear();
}
state.selection.select([...frontier], true);
}
view.updateGraphVisibility();
}
};
let eventHandled = true; // unless the below switch defaults
switch (d3.event.keyCode) {
case 49:
case 50:
case 51:
case 52:
case 53:
case 54:
case 55:
case 56:
case 57:
// '1'-'9'
showSelectionFrontierNodes(true,
(edge: Edge, index: number) => index == (d3.event.keyCode - 49),
!d3.event.ctrlKey);
break;
case 97:
case 98:
case 99:
case 100:
case 101:
case 102:
case 103:
case 104:
case 105:
// 'numpad 1'-'numpad 9'
showSelectionFrontierNodes(true,
(edge, index) => index == (d3.event.keyCode - 97),
!d3.event.ctrlKey);
break;
case 67:
// 'c'
showSelectionFrontierNodes(d3.event.altKey,
(edge, index) => edge.type == 'control',
true);
break;
case 69:
// 'e'
showSelectionFrontierNodes(d3.event.altKey,
(edge, index) => edge.type == 'effect',
true);
break;
case 79:
// 'o'
showSelectionFrontierNodes(false, undefined, false);
break;
case 73:
// 'i'
if (!d3.event.ctrlKey && !d3.event.shiftKey) {
showSelectionFrontierNodes(true, undefined, false);
} else {
eventHandled = false;
}
break;
case 65:
// 'a'
view.selectAllNodes();
break;
case 38:
// UP
case 40: {
// DOWN
showSelectionFrontierNodes(d3.event.keyCode == 38, undefined, true);
break;
}
case 82:
// 'r'
if (!d3.event.ctrlKey && !d3.event.shiftKey) {
this.layoutAction(this);
} else {
eventHandled = false;
}
break;
case 83:
// 's'
view.selectOrigins();
break;
default:
eventHandled = false;
break;
}
if (eventHandled) {
d3.event.preventDefault();
//.........这里部分代码省略.........
示例2: svgKeyDown
//.........这里部分代码省略.........
if (frontier != undefined && frontier.size) {
if (select) {
if (!d3.event.shiftKey) {
state.selection.clear();
}
state.selection.select(frontier, true);
}
graph.updateGraphVisibility();
}
allowRepetition = false;
}
var allowRepetition = true;
var eventHandled = true; // unless the below switch defaults
switch (d3.event.keyCode) {
case 49:
case 50:
case 51:
case 52:
case 53:
case 54:
case 55:
case 56:
case 57:
// '1'-'9'
showSelectionFrontierNodes(true,
(edge, index) => { return index == (d3.event.keyCode - 49); },
false);
break;
case 97:
case 98:
case 99:
case 100:
case 101:
case 102:
case 103:
case 104:
case 105:
// 'numpad 1'-'numpad 9'
showSelectionFrontierNodes(true,
(edge, index) => { return index == (d3.event.keyCode - 97); },
false);
break;
case 67:
// 'c'
showSelectionFrontierNodes(d3.event.altKey,
(edge, index) => { return edge.type == 'control'; },
true);
break;
case 69:
// 'e'
showSelectionFrontierNodes(d3.event.altKey,
(edge, index) => { return edge.type == 'effect'; },
true);
break;
case 79:
// 'o'
showSelectionFrontierNodes(false, undefined, false);
break;
case 73:
// 'i'
showSelectionFrontierNodes(true, undefined, false);
break;
case 65:
// 'a'
graph.selectAllNodes();
allowRepetition = false;
break;
case 38:
case 40: {
showSelectionFrontierNodes(d3.event.keyCode == 38, undefined, true);
break;
}
case 82:
// 'r'
if (!d3.event.ctrlKey) {
this.layoutAction(this);
} else {
eventHandled = false;
}
break;
case 83:
// 's'
graph.selectOrigins();
break;
case 191:
// '/'
document.getElementById("search-input").focus();
break;
default:
eventHandled = false;
break;
}
if (eventHandled) {
d3.event.preventDefault();
}
if (!allowRepetition) {
state.lastKeyDown = d3.event.keyCode;
}
}